Merge pull request 'm' (#2) from develop into main

src/META-INF/MANIFEST.MF

@@ -0,0 +1,3 @@
+Manifest-Version: 1.0
+Main-Class: com.mathlearning.Main
+

src/app.py

@@ -1,196 +0,0 @@
-# src/app.py
-import customtkinter as ctk
-import random
-import string
-from user_manager import UserManager, send_verification_email
-from quiz_generator import get_generator
-
-class MathApp(ctk.CTk):
-    def __init__(self):
-        super().__init__()
-        self.title("小初高数学学习软件")
-        self.geometry("500x450")
-        ctk.set_appearance_mode("System")
-        
-        self.user_manager = UserManager()
-        self.current_user = None
-        
-        container = ctk.CTkFrame(self)
-        container.pack(side="top", fill="both", expand=True)
-        container.grid_rowconfigure(0, weight=1)
-        container.grid_columnconfigure(0, weight=1)
-
-        self.frames = {}
-        # 还原：只包含基础的五个页面
-        for F in (LoginPage, RegisterPage, MainPage, QuizPage, ScorePage):
-            page_name = F.__name__
-            frame = F(parent=container, controller=self)
-            self.frames[page_name] = frame
-            frame.grid(row=0, column=0, sticky="nsew")
-
-        self.show_frame("LoginPage")
-
-    def show_frame(self, page_name):
-        frame = self.frames[page_name]
-        frame.tkraise()
-
-class LoginPage(ctk.CTkFrame):
-    def __init__(self, parent, controller):
-        super().__init__(parent)
-        self.controller = controller
-        ctk.CTkLabel(self, text="登录", font=ctk.CTkFont(size=24, weight="bold")).pack(pady=20)
-        self.email_entry = ctk.CTkEntry(self, placeholder_text="邮箱", width=200)
-        self.email_entry.pack(pady=10)
-        self.password_entry = ctk.CTkEntry(self, placeholder_text="密码", show="*", width=200)
-        self.password_entry.pack(pady=10)
-        self.error_label = ctk.CTkLabel(self, text="", text_color="red")
-        self.error_label.pack(pady=5)
-        ctk.CTkButton(self, text="登录", command=self.login).pack(pady=10)
-        ctk.CTkButton(self, text="没有账户？去注册", fg_color="transparent", command=lambda: controller.show_frame("RegisterPage")).pack()
-
-    def login(self):
-        email, password = self.email_entry.get(), self.password_entry.get()
-        if self.controller.user_manager.validate_login(email, password):
-            self.controller.current_user = email
-            self.error_label.configure(text="")
-            self.controller.show_frame("MainPage")
-        else:
-            self.error_label.configure(text="邮箱或密码错误")
-
-class RegisterPage(ctk.CTkFrame):
-    def __init__(self, parent, controller):
-        super().__init__(parent)
-        self.controller = controller
-        self.code = ""
-        self.cooldown_time = 0
-        ctk.CTkLabel(self, text="注册新账户", font=ctk.CTkFont(size=24, weight="bold")).pack(pady=10)
-        self.email_entry = ctk.CTkEntry(self, placeholder_text="邮箱", width=250)
-        self.email_entry.pack(pady=5)
-        self.send_code_button = ctk.CTkButton(self, text="发送验证码", command=self.send_code, width=250)
-        self.send_code_button.pack(pady=5)
-        self.code_entry = ctk.CTkEntry(self, placeholder_text="输入收到的邮件验证码", width=250)
-        self.code_entry.pack(pady=5)
-        self.password_entry = ctk.CTkEntry(self, placeholder_text="密码 (6-10位,含大小写和数字)", show="*", width=250)
-        self.password_entry.pack(pady=5)
-        self.confirm_password_entry = ctk.CTkEntry(self, placeholder_text="确认密码", show="*", width=250)
-        self.confirm_password_entry.pack(pady=5)
-        self.info_label = ctk.CTkLabel(self, text="", text_color="red")
-        self.info_label.pack(pady=5)
-        ctk.CTkButton(self, text="注册", command=self.register).pack(pady=10)
-        ctk.CTkButton(self, text="返回登录", fg_color="transparent", command=lambda: controller.show_frame("LoginPage")).pack()
-
-    def update_cooldown(self):
-        if self.cooldown_time > 0:
-            self.send_code_button.configure(text=f"{self.cooldown_time}秒后可重试")
-            self.cooldown_time -= 1
-            self.after(1000, self.update_cooldown)
-        else:
-            self.send_code_button.configure(text="发送验证码", state="normal")
-
-    def send_code(self):
-        if self.cooldown_time > 0: return
-        email = self.email_entry.get().strip()
-        if not email:
-            self.info_label.configure(text="请输入邮箱地址。", text_color="red")
-            return
-        if self.controller.user_manager.is_email_registered(email):
-            self.info_label.configure(text="该邮箱已被注册。", text_color="red")
-            return
-            
-        self.code = ''.join(random.choices(string.digits, k=6))
-        self.info_label.configure(text="正在发送邮件，请稍候...", text_color="gray")
-        success = send_verification_email(email, self.code)
-        
-        if success:
-            self.info_label.configure(text="邮件验证码已发送至您的邮箱，请查收。", text_color="green")
-            self.cooldown_time = 60
-            self.send_code_button.configure(state="disabled")
-            self.update_cooldown()
-        else:
-            self.info_label.configure(text="邮件发送失败，请检查邮箱或网络。", text_color="red")
-            self.code = ""
-
-    def register(self):
-        email, user_code, password, confirm_password = self.email_entry.get().strip(), self.code_entry.get().strip(), self.password_entry.get(), self.confirm_password_entry.get()
-        if not self.code or user_code != self.code:
-            self.info_label.configure(text="邮件验证码错误", text_color="red")
-            return
-        if password != confirm_password:
-            self.info_label.configure(text="两次输入的密码不一致", text_color="red")
-            return
-        if not self.controller.user_manager.validate_password_format(password):
-            self.info_label.configure(text="密码格式不符合要求", text_color="red")
-            return
-        success, msg = self.controller.user_manager.register_user(email, password)
-        self.info_label.configure(text=msg, text_color="green" if success else "red")
-        if success: self.code = ""
-
-class MainPage(ctk.CTkFrame):
-    def __init__(self, parent, controller):
-        super().__init__(parent)
-        self.controller = controller
-        ctk.CTkLabel(self, text="选择学习阶段", font=ctk.CTkFont(size=24, weight="bold")).pack(pady=20)
-        ctk.CTkButton(self, text="小学", command=lambda: self.start_quiz("小学"), height=40, width=150).pack(pady=10)
-        ctk.CTkButton(self, text="初中", command=lambda: self.start_quiz("初中"), height=40, width=150).pack(pady=10)
-        ctk.CTkButton(self, text="高中", command=lambda: self.start_quiz("高中"), height=40, width=150).pack(pady=10)
-        ctk.CTkButton(self, text="退出登录", fg_color="transparent", command=lambda: controller.show_frame("LoginPage")).pack(side="bottom", pady=20)
-
-    def start_quiz(self, level):
-        dialog = ctk.CTkInputDialog(text="请输入题目数量 (1-20):", title="设置题目数量")
-        num_str = dialog.get_input()
-        if num_str:
-            try:
-                num = int(num_str)
-                if 1 <= num <= 20:
-                    self.controller.frames["QuizPage"].setup_quiz(level, num)
-                    self.controller.show_frame("QuizPage")
-            except ValueError: pass
-
-class QuizPage(ctk.CTkFrame):
-    def __init__(self, parent, controller):
-        super().__init__(parent)
-        self.controller = controller
-        self.question_label = ctk.CTkLabel(self, text="问题", font=ctk.CTkFont(size=18))
-        self.question_label.pack(pady=20, padx=20)
-        self.radio_var = ctk.IntVar(value=-1)
-        self.radio_buttons = []
-        for i in range(4):
-            rb = ctk.CTkRadioButton(self, text="", variable=self.radio_var, value=i, font=ctk.CTkFont(size=14))
-            rb.pack(anchor="w", padx=100, pady=5)
-            self.radio_buttons.append(rb)
-        self.submit_button = ctk.CTkButton(self, text="下一题", command=self.next_question)
-        self.submit_button.pack(pady=20)
-    def setup_quiz(self, level, num_questions):
-        self.questions = get_generator(level).generate_bunch(num_questions)
-        self.current_question_index = 0
-        self.user_answers = []
-        self.display_question()
-    def display_question(self):
-        self.radio_var.set(-1)
-        q = self.questions[self.current_question_index]
-        self.question_label.configure(text=f"{self.current_question_index + 1}. {q.text} = ?")
-        for i, option in enumerate(q.options): self.radio_buttons[i].configure(text=str(option))
-        self.submit_button.configure(text="提交试卷" if self.current_question_index == len(self.questions) - 1 else "下一题")
-    def next_question(self):
-        if self.radio_var.get() == -1: return
-        self.user_answers.append(self.radio_var.get())
-        self.current_question_index += 1
-        if self.current_question_index < len(self.questions): self.display_question()
-        else: self.calculate_score()
-    def calculate_score(self):
-        correct_count = sum(1 for i, q in enumerate(self.questions) if self.user_answers[i] == q.correct_answer_index)
-        total = len(self.questions)
-        score_percent = (correct_count / total) * 100
-        self.controller.frames["ScorePage"].show_score(correct_count, total, score_percent)
-        self.controller.show_frame("ScorePage")
-
-class ScorePage(ctk.CTkFrame):
-    def __init__(self, parent, controller):
-        super().__init__(parent)
-        self.controller = controller
-        self.score_label = ctk.CTkLabel(self, text="", font=ctk.CTkFont(size=24))
-        self.score_label.pack(pady=40, padx=20)
-        ctk.CTkButton(self, text="继续做题", command=lambda: controller.show_frame("MainPage")).pack(pady=10)
-        ctk.CTkButton(self, text="退出程序", command=controller.quit).pack(pady=10)
-    def show_score(self, correct, total, percent):
-        self.score_label.configure(text=f"答对了 {correct} / {total} 题\n\n得分: {percent:.2f}%")

src/com/mathlearning/Main.java

@@ -0,0 +1,14 @@
+package com.mathlearning;
+
+import com.mathlearning.controller.NavigationController;
+
+import javax.swing.*;
+
+public class Main {
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            NavigationController navigationController = new NavigationController();
+            navigationController.showLoginView();
+        });
+    }
+}

src/com/mathlearning/controller/AuthController.java

@@ -0,0 +1,133 @@
+package com.mathlearning.controller;
+
+import com.mathlearning.model.User;
+import com.mathlearning.model.UserManager;
+import com.mathlearning.util.EmailUtil;
+import com.mathlearning.util.PasswordValidator;
+import com.mathlearning.util.UsernameValidator;
+
+public class AuthController {
+    private UserManager userManager;
+    
+    public AuthController() {
+        this.userManager = UserManager.getInstance();
+    }
+    
+ 
+    public String sendVerificationCode(String email, String username) {
+        if (!isValidEmail(email)) {
+            return null;
+        }
+        
+        if (!UsernameValidator.isValid(username)) {
+            return null;
+        }
+        
+        if (userManager.userExistsByEmail(email)) {
+            User existingUser = userManager.getUserByEmail(email);
+            if (existingUser.isRegistered()) {
+                return null; 
+            }
+        }
+        
+        if (userManager.userExistsByUsername(username)) {
+            User existingUser = userManager.getUserByUsername(username);
+            if (existingUser.isRegistered() || !existingUser.getEmail().equals(email)) {
+                return null; 
+            }
+        }
+        
+        String verificationCode = EmailUtil.sendVerificationCode(email);
+        return verificationCode;
+    }
+    
+
+    public boolean createUnregisteredUser(String email, String username, String verificationCode) {
+        if (verificationCode == null) {
+            return false;
+        }
+        
+        User existingUser = userManager.getUserByEmail(email);
+        if (existingUser != null && !existingUser.isRegistered()) {
+            existingUser.setUsername(username);
+            existingUser.setVerificationCode(verificationCode);
+        } else {
+            User user = new User(email, username);
+            user.setVerificationCode(verificationCode);
+            userManager.addUser(user);
+        }
+        
+        return true;
+    }
+    
+    public boolean verifyCode(String email, String code) {
+        User user = userManager.getUserByEmail(email);
+        return user != null && code.equals(user.getVerificationCode());
+    }
+    
+    public boolean setPassword(String email, String password, String confirmPassword) {
+        if (!password.equals(confirmPassword)) {
+            return false;
+        }
+        
+        if (!PasswordValidator.isValid(password)) {
+            return false;
+        }
+        
+        User user = userManager.getUserByEmail(email);
+        if (user != null) {
+            user.setPassword(password);
+            user.setRegistered(true);
+            userManager.saveUsers();
+            return true;
+        }
+        
+        return false;
+    }
+    
+    public boolean login(String identifier, String password) {
+        User user = userManager.getUser(identifier);
+        return user != null && user.isRegistered() && 
+               password.equals(user.getPassword());
+    }
+    
+    public boolean changePassword(String identifier, String oldPassword, String newPassword, String confirmPassword) {
+        if (!newPassword.equals(confirmPassword)) {
+            return false;
+        }
+        
+        if (!PasswordValidator.isValid(newPassword)) {
+            return false;
+        }
+        
+        User user = userManager.getUser(identifier);
+        if (user != null && oldPassword.equals(user.getPassword())) {
+            user.setPassword(newPassword);
+            userManager.saveUsers();
+            return true;
+        }
+        
+        return false;
+    }
+    
+    private boolean isValidEmail(String email) {
+        return EmailUtil.isValidEmail(email);
+    }
+    
+    public String getUserEmail(String identifier) {
+        User user = userManager.getUser(identifier);
+        return user != null ? user.getEmail() : identifier;
+    }
+    
+ 
+    public boolean isEmailAvailable(String email) {
+        User user = userManager.getUserByEmail(email);
+        return user == null || !user.isRegistered();
+    }
+    
+ 
+    public boolean isUsernameAvailable(String username) {
+        User user = userManager.getUserByUsername(username);
+        return user == null || !user.isRegistered();
+    }
+}

src/com/mathlearning/controller/ExamController.java

@@ -0,0 +1,225 @@
+package com.mathlearning.controller;
+
+import com.mathlearning.model.*;
+import com.mathlearning.util.ExamFileUtil;
+
+import java.util.*;
+
+public class ExamController {
+    private Paper currentPaper;
+    private String currentUser;
+    private String currentLevel;
+    
+    public ExamController() {
+    }
+    
+    public void createExam(String level, int questionCount) {
+        System.out.println("=== 开始创建试卷 ===");
+        System.out.println("级别: " + level + ", 题目数量: " + questionCount);
+        
+        long startTime = System.currentTimeMillis();
+        this.currentLevel = level;
+        
+        try {
+            QuestionGenerator generator = QuestionGenerator.createGenerator(level);
+            System.out.println("生成器创建完成: " + generator.getClass().getSimpleName());
+            
+            List<Question> questions = generateQuestionsWithTimeout(generator, questionCount, 15000); // 15秒超时
+            
+            System.out.println("题目生成完成，生成了 " + questions.size() + " 道题目");
+            
+            int duplicateCount = checkForDuplicates(questions);
+            if (duplicateCount > 0) {
+                System.out.println("警告: 发现 " + duplicateCount + " 道重复题目");
+            }
+            
+            currentPaper = new Paper(level);
+            for (Question question : questions) {
+                currentPaper.addQuestion(question);
+            }
+            
+            long endTime = System.currentTimeMillis();
+            System.out.println("试卷创建完成，耗时: " + (endTime - startTime) + "ms");
+            System.out.println("=== 试卷创建结束 ===");
+            
+        } catch (Exception e) {
+            System.err.println("创建试卷时发生错误: " + e.getMessage());
+            e.printStackTrace();
+            currentPaper = new Paper(level);
+            List<Question> basicQuestions = generateBasicQuestions(questionCount);
+            for (Question question : basicQuestions) {
+                currentPaper.addQuestion(question);
+            }
+        }
+    }
+    
+    
+    private List<Question> generateQuestionsWithTimeout(QuestionGenerator generator, int count, long timeoutMs) {
+        long startTime = System.currentTimeMillis();
+        List<Question> questions = new ArrayList<>();
+        
+        try {
+            List<Question> generated = generator.generateQuestions(count);
+            questions.addAll(generated);
+            
+            if ((System.currentTimeMillis() - startTime) > timeoutMs) {
+                System.out.println("生成题目超时，使用已生成的部分题目");
+            }
+            
+            if (questions.size() > count) {
+                questions = questions.subList(0, count);
+            }
+            
+        } catch (Exception e) {
+            System.err.println("生成题目时出错: " + e.getMessage());
+        }
+        
+        if (questions.size() < count) {
+            System.out.println("题目数量不足，补充基础题目...");
+            int needed = count - questions.size();
+            List<Question> basicQuestions = generateBasicQuestions(needed);
+            questions.addAll(basicQuestions);
+        }
+        
+        return questions;
+    }
+    
+
+    private List<Question> generateBasicQuestions(int count) {
+        System.out.println("生成 " + count + " 道基础题目");
+        List<Question> basicQuestions = new ArrayList<>();
+        Random random = new Random();
+        
+        for (int i = 0; i < count; i++) {
+            int a = random.nextInt(10) + 1;
+            int b = random.nextInt(10) + 1;
+            int operation = random.nextInt(2); // 0: 加法, 1: 减法
+            
+            String expression;
+            int answer;
+            
+            if (operation == 0) {
+                expression = a + " + " + b;
+                answer = a + b;
+            } else {
+                if (a < b) {
+                    int temp = a;
+                    a = b;
+                    b = temp;
+                }
+                expression = a + " - " + b;
+                answer = a - b;
+            }
+            
+            Set<String> options = new HashSet<>();
+            options.add(String.valueOf(answer));
+            
+            while (options.size() < 4) {
+                int variation = random.nextInt(5) + 1;
+                int wrongAnswer;
+                if (random.nextBoolean()) {
+                    wrongAnswer = answer + variation;
+                } else {
+                    wrongAnswer = Math.max(1, answer - variation);
+                }
+                options.add(String.valueOf(wrongAnswer));
+            }
+            
+            List<String> optionList = new ArrayList<>(options);
+            Collections.shuffle(optionList);
+            String optionsStr = String.join(",", optionList);
+            
+            basicQuestions.add(new Question(expression + " = ?", optionsStr, String.valueOf(answer)));
+        }
+        
+        return basicQuestions;
+    }
+    
+ 
+    public boolean saveCurrentPaper() {
+        if (currentPaper == null || currentUser == null) {
+            System.err.println("无法保存试卷: 试卷或用户信息为空");
+            return false;
+        }
+        
+        return ExamFileUtil.savePaperToFile(currentUser, currentPaper);
+    }
+    
+    private int checkForDuplicates(List<Question> questions) {
+        Set<String> expressions = new HashSet<>();
+        int duplicateCount = 0;
+        
+        for (Question question : questions) {
+            String expression = extractExpression(question.getContent());
+            if (expressions.contains(expression)) {
+                duplicateCount++;
+                System.out.println("发现重复题目: " + question.getContent());
+            } else {
+                expressions.add(expression);
+            }
+        }
+        
+        return duplicateCount;
+    }
+    
+    private String extractExpression(String content) {
+        if (content == null) return "";
+        return content.replace(" = ?", "").trim();
+    }
+    
+    public Question getCurrentQuestion() {
+        return currentPaper != null ? currentPaper.getCurrentQuestion() : null;
+    }
+    
+    public boolean hasNextQuestion() {
+        return currentPaper != null && currentPaper.hasNextQuestion();
+    }
+    
+    public void nextQuestion() {
+        if (currentPaper != null) {
+            currentPaper.nextQuestion();
+        }
+    }
+    
+    public boolean hasPreviousQuestion() {
+        return currentPaper != null && currentPaper.hasPreviousQuestion();
+    }
+    
+    public void previousQuestion() {
+        if (currentPaper != null) {
+            currentPaper.previousQuestion();
+        }
+    }
+    
+    public void submitAnswer(String answer) {
+        Question currentQuestion = getCurrentQuestion();
+        if (currentQuestion != null) {
+            currentQuestion.setUserAnswer(answer);
+            System.out.println("题目 " + getCurrentQuestionNumber() + " 答案设置为: " + answer);
+        }
+    }
+    
+    public int calculateScore() {
+        return currentPaper != null ? currentPaper.calculateScore() : 0;
+    }
+    
+    public int getCurrentQuestionNumber() {
+        return currentPaper != null ? currentPaper.getCurrentQuestionNumber() : 0;
+    }
+    
+    public int getTotalQuestions() {
+        return currentPaper != null ? currentPaper.getTotalQuestions() : 0;
+    }
+    
+    public String getCurrentLevel() {
+        return currentLevel;
+    }
+    
+    public void setCurrentUser(String user) {
+        this.currentUser = user;
+    }
+    
+    public Paper getCurrentPaper() {
+        return currentPaper;
+    }
+}

src/com/mathlearning/controller/NavigationController.java

@@ -0,0 +1,84 @@
+package com.mathlearning.controller;
+
+import com.mathlearning.view.*;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class NavigationController {
+    private JFrame mainFrame;
+    private CardLayout cardLayout;
+    private JPanel mainPanel;
+    private String currentUser;
+    private String currentUserEmail;
+    
+    public NavigationController() {
+        initializeMainFrame();
+    }
+    
+    private void initializeMainFrame() {
+        mainFrame = new JFrame("数学学习软件");
+        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        mainFrame.setSize(600, 500);
+        mainFrame.setLocationRelativeTo(null);
+        
+        cardLayout = new CardLayout();
+        mainPanel = new JPanel(cardLayout);
+        
+        LoginView loginView = new LoginView(this);
+        mainPanel.add(loginView, "LOGIN");
+        
+        mainFrame.add(mainPanel);
+    }
+    
+    public void showLoginView() {
+        cardLayout.show(mainPanel, "LOGIN");
+        mainFrame.setVisible(true);
+    }
+    
+    public void showRegisterView() {
+        RegisterView registerView = new RegisterView(this);
+        mainPanel.add(registerView, "REGISTER");
+        cardLayout.show(mainPanel, "REGISTER");
+    }
+    
+    public void showSetPasswordView(String email, String verificationCode) {
+        SetPasswordView setPasswordView = new SetPasswordView(this, email, verificationCode);
+        mainPanel.add(setPasswordView, "SET_PASSWORD");
+        cardLayout.show(mainPanel, "SET_PASSWORD");
+    }
+    
+    public void showLevelSelectionView(String userIdentifier, String email) {
+        this.currentUser = userIdentifier;
+        this.currentUserEmail = email;
+        LevelSelectionView levelSelectionView = new LevelSelectionView(this, userIdentifier, email);
+        mainPanel.add(levelSelectionView, "LEVEL_SELECTION");
+        cardLayout.show(mainPanel, "LEVEL_SELECTION");
+    }
+    
+    public void showQuestionCountView(String level) {
+        QuestionCountView questionCountView = new QuestionCountView(this, currentUser, currentUserEmail, level);
+        mainPanel.add(questionCountView, "QUESTION_COUNT");
+        cardLayout.show(mainPanel, "QUESTION_COUNT");
+    }
+    
+    public void showExamView(String level, int questionCount) {
+        ExamView examView = new ExamView(this, currentUser, currentUserEmail, level, questionCount);
+        mainPanel.add(examView, "EXAM");
+        cardLayout.show(mainPanel, "EXAM");
+    }
+    
+    public void showScoreView(String level, int score, int totalQuestions) {
+        ScoreView scoreView = new ScoreView(this, currentUser, currentUserEmail, level, score, totalQuestions);
+        mainPanel.add(scoreView, "SCORE");
+        cardLayout.show(mainPanel, "SCORE");
+    }
+    
+    public void showChangePasswordView(String identifier) {
+        JOptionPane.showMessageDialog(mainFrame, "修改密码功能待实现", "提示", JOptionPane.INFORMATION_MESSAGE);
+    }
+    
+    public JFrame getMainFrame() {
+        return mainFrame;
+    }
+}

src/com/mathlearning/model/Paper.java

@@ -0,0 +1,73 @@
+package com.mathlearning.model;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Paper implements Serializable {
+    private static final long serialVersionUID = 1L;
+    
+    private List<Question> questions;
+    private int currentQuestionIndex;
+    private String level;
+    
+    public Paper(String level) {
+        this.questions = new ArrayList<>();
+        this.currentQuestionIndex = 0;
+        this.level = level;
+    }
+    
+    public void addQuestion(Question question) {
+        questions.add(question);
+    }
+    
+    public Question getCurrentQuestion() {
+        if (currentQuestionIndex < questions.size()) {
+            return questions.get(currentQuestionIndex);
+        }
+        return null;
+    }
+    
+    public boolean hasNextQuestion() {
+        return currentQuestionIndex < questions.size() - 1;
+    }
+    
+    public void nextQuestion() {
+        if (hasNextQuestion()) {
+            currentQuestionIndex++;
+        }
+    }
+    
+    public boolean hasPreviousQuestion() {
+        return currentQuestionIndex > 0;
+    }
+    
+    public void previousQuestion() {
+        if (hasPreviousQuestion()) {
+            currentQuestionIndex--;
+        }
+    }
+    
+    public int getTotalQuestions() {
+        return questions.size();
+    }
+    
+    public int getCurrentQuestionNumber() {
+        return currentQuestionIndex + 1;
+    }
+    
+    public int calculateScore() {
+        int correctCount = 0;
+        for (Question q : questions) {
+            if (q.isCorrect()) {
+                correctCount++;
+            }
+        }
+        return (int) ((correctCount * 100.0) / questions.size());
+    }
+    
+    public String getLevel() { return level; }
+    public void setLevel(String level) { this.level = level; }
+    
+    public List<Question> getQuestions() { return questions; }
+}

src/com/mathlearning/model/Question.java

@@ -0,0 +1,39 @@
+package com.mathlearning.model;
+
+import java.io.Serializable;
+
+public class Question implements Serializable {
+    private static final long serialVersionUID = 1L;
+    
+    private String content;
+    private String[] options;
+    private String correctAnswer;
+    private String userAnswer;
+    
+    public Question(String content, String options, String correctAnswer) {
+        this.content = content;
+        this.options = options.split(",");
+        this.correctAnswer = correctAnswer;
+    }
+    
+    // Getters and setters
+    public String getContent() { return content; }
+    public void setContent(String content) { this.content = content; }
+    
+    public String[] getOptions() { return options; }
+    public void setOptions(String[] options) { this.options = options; }
+    
+    public String getCorrectAnswer() { return correctAnswer; }
+    public void setCorrectAnswer(String correctAnswer) { this.correctAnswer = correctAnswer; }
+    
+    public String getUserAnswer() { return userAnswer; }
+    public void setUserAnswer(String userAnswer) { this.userAnswer = userAnswer; }
+    
+    public boolean isCorrect() {
+        return correctAnswer != null && correctAnswer.equals(userAnswer);
+    }
+    
+    public String getOptionsAsString() {
+        return String.join(",", options);
+    }
+}

src/com/mathlearning/model/QuestionGenerator.java

@@ -0,0 +1,278 @@
+package com.mathlearning.model;
+
+import java.util.*;
+
+public abstract class QuestionGenerator {
+    protected Random random = new Random();
+    
+    public abstract List<Question> generateQuestions(int count);
+    
+    protected String generateOptions(String correctAnswer) {
+        Set<String> options = new HashSet<>();
+        options.add(correctAnswer);
+        
+        while (options.size() < 4) {
+            try {
+                double correctValue = Double.parseDouble(correctAnswer);
+                double variation = correctValue * 0.2 + 1; // 20% 变化，至少1
+                double wrongValue = correctValue + (random.nextDouble() * 2 - 1) * variation;
+                
+                if (wrongValue <= 0) {
+                    wrongValue = Math.abs(wrongValue) + 1;
+                }
+                
+                String formattedValue;
+                if (correctAnswer.contains(".")) {
+                    formattedValue = String.format("%.2f", wrongValue);
+                } else {
+                    formattedValue = String.valueOf((int) wrongValue);
+                }
+                
+                options.add(formattedValue);
+            } catch (NumberFormatException e) {
+                int wrongValue = random.nextInt(20) + 1;
+                options.add(String.valueOf(wrongValue));
+            }
+        }
+        
+        List<String> optionList = new ArrayList<>(options);
+        Collections.shuffle(optionList);
+        return String.join(",", optionList);
+    }
+    
+    public static QuestionGenerator createGenerator(String level) {
+        switch (level) {
+            case "小学":
+                return new OptimizedPrimaryQuestionGenerator();
+            case "初中":
+                return new OptimizedMiddleSchoolQuestionGenerator();
+            case "高中":
+                return new OptimizedHighSchoolQuestionGenerator();
+            default:
+                return new OptimizedPrimaryQuestionGenerator();
+        }
+    }
+    
+    protected int generateOperand() {
+        return random.nextInt(50) + 1;
+    }
+    
+    protected int generateSmallOperand() {
+        return random.nextInt(12) + 1;
+    }
+}
+
+class OptimizedPrimaryQuestionGenerator extends QuestionGenerator {
+    @Override
+    public List<Question> generateQuestions(int count) {
+        System.out.println("开始生成小学题目，数量: " + count);
+        List<Question> questions = new ArrayList<>();
+        Set<String> usedExpressions = new HashSet<>();
+        
+        String[][] templates = {
+            {"{0} + {1} = ?", "+"},
+            {"{0} - {1} = ?", "-"}, 
+            {"{0} × {1} = ?", "×"}
+        };
+        
+        int maxAttempts = count * 5; 
+        int attempts = 0;
+        
+        while (questions.size() < count && attempts < maxAttempts) {
+            attempts++;
+            
+            String[] template = templates[random.nextInt(templates.length)];
+            String expression;
+            int answer;
+            
+            switch (template[1]) {
+                case "+":
+                    int a1 = generateOperand();
+                    int b1 = generateOperand();
+                    expression = a1 + " + " + b1;
+                    answer = a1 + b1;
+                    break;
+                case "-":
+                    int a2 = generateOperand();
+                    int b2 = generateOperand();
+                    if (a2 < b2) {
+                        int temp = a2;
+                        a2 = b2;
+                        b2 = temp;
+                    }
+                    expression = a2 + " - " + b2;
+                    answer = a2 - b2;
+                    break;
+                case "×":
+                    int a3 = generateSmallOperand();
+                    int b3 = generateSmallOperand();
+                    expression = a3 + " × " + b3;
+                    answer = a3 * b3;
+                    break;
+                default:
+                    continue;
+            }
+                        if (usedExpressions.contains(expression)) {
+                continue;
+            }
+            usedExpressions.add(expression);
+            String options = generateOptions(String.valueOf(answer));
+            questions.add(new Question(expression + " = ?", options, String.valueOf(answer)));
+            
+            if (questions.size() % 10 == 0) {
+                System.out.println("已生成 " + questions.size() + " 道小学题目");
+            }
+        }
+        
+        System.out.println("小学题目生成完成，实际生成: " + questions.size() + " 道题目");
+        
+        if (questions.size() < count) {
+            System.out.println("补充简单小学题目...");
+            for (int i = questions.size(); i < count; i++) {
+                int a = random.nextInt(10) + 1;
+                int b = random.nextInt(10) + 1;
+                String expression = a + " + " + b;
+                if (!usedExpressions.contains(expression)) {
+                    int answer = a + b;
+                    String options = generateOptions(String.valueOf(answer));
+                    questions.add(new Question(expression + " = ?", options, String.valueOf(answer)));
+                    usedExpressions.add(expression);
+                }
+            }
+        }
+        
+        return questions;
+    }
+}
+
+class OptimizedMiddleSchoolQuestionGenerator extends QuestionGenerator {
+    @Override
+    public List<Question> generateQuestions(int count) {
+        System.out.println("开始生成初中题目，数量: " + count);
+        List<Question> questions = new ArrayList<>();
+        Set<String> usedExpressions = new HashSet<>();
+        
+        int maxAttempts = count * 5;
+        int attempts = 0;
+        
+        while (questions.size() < count && attempts < maxAttempts) {
+            attempts++;
+            
+            int type = random.nextInt(4); 
+            
+            String expression;
+            int answer;
+            
+            switch (type) {
+                case 0: 
+                    int num = random.nextInt(15) + 1; 
+                    expression = num + "²";
+                    answer = num * num;
+                    break;
+                case 1: 
+                    int root = random.nextInt(12) + 1; 
+                    expression = "√" + (root * root);
+                    answer = root;
+                    break;
+                case 2: 
+                    int x = random.nextInt(8) + 2; 
+                    int y = random.nextInt(8) + 2; 
+                    expression = "(" + x + " + " + y + ")²";
+                    answer = (x + y) * (x + y);
+                    break;
+                default: 
+                    int a = generateOperand();
+                    int b = generateOperand();
+                    if (random.nextBoolean()) {
+                        expression = a + " + " + b;
+                        answer = a + b;
+                    } else {
+                        if (a < b) {
+                            int temp = a;
+                            a = b;
+                            b = temp;
+                        }
+                        expression = a + " - " + b;
+                        answer = a - b;
+                    }
+                    break;
+            }
+            
+            if (usedExpressions.contains(expression)) {
+                continue;
+            }
+            
+            usedExpressions.add(expression);
+            String options = generateOptions(String.valueOf(answer));
+            questions.add(new Question(expression + " = ?", options, String.valueOf(answer)));
+            
+            if (questions.size() % 10 == 0) {
+                System.out.println("已生成 " + questions.size() + " 道初中题目");
+            }
+        }
+        
+        System.out.println("初中题目生成完成，实际生成: " + questions.size() + " 道题目");
+        return questions;
+    }
+}
+
+class OptimizedHighSchoolQuestionGenerator extends QuestionGenerator {
+    @Override
+    public List<Question> generateQuestions(int count) {
+        System.out.println("开始生成高中题目，数量: " + count);
+        List<Question> questions = new ArrayList<>();
+        Set<String> usedExpressions = new HashSet<>();
+        
+        int[] angles = {0, 30, 45, 60, 90, 120, 135, 150, 180};
+        String[] functions = {"sin", "cos", "tan"};
+        
+        int maxAttempts = count * 5;
+        int attempts = 0;
+        
+        while (questions.size() < count && attempts < maxAttempts) {
+            attempts++;
+            
+            String function = functions[random.nextInt(functions.length)];
+            int angle = angles[random.nextInt(angles.length)];
+            
+            String expression = function + "(" + angle + "°)";
+            double result;
+            
+            switch (function) {
+                case "sin":
+                    result = Math.sin(Math.toRadians(angle));
+                    break;
+                case "cos":
+                    result = Math.cos(Math.toRadians(angle));
+                    break;
+                case "tan":
+                    if (angle % 90 == 0 && angle % 180 != 0) {
+                        continue;
+                    }
+                    result = Math.tan(Math.toRadians(angle));
+                    if (Math.abs(result) > 10) {
+                        continue;
+                    }
+                    break;
+                default:
+                    result = 0;
+            }
+            
+            String formattedAnswer = String.format("%.2f", result);
+            if (usedExpressions.contains(expression)) {
+                continue;
+            }
+            
+            usedExpressions.add(expression);
+            String options = generateOptions(formattedAnswer);
+            questions.add(new Question(expression + " = ?", options, formattedAnswer));
+            
+            if (questions.size() % 10 == 0) {
+                System.out.println("已生成 " + questions.size() + " 道高中题目");
+            }
+        }
+        
+        System.out.println("高中题目生成完成，实际生成: " + questions.size() + " 道题目");
+        return questions;
+    }
+}

src/com/mathlearning/model/User.java

@@ -0,0 +1,41 @@
+package com.mathlearning.model;
+
+import java.io.Serializable;
+
+public class User implements Serializable {
+    private static final long serialVersionUID = 1L;
+    
+    private String email;
+    private String username;  
+    private String password;
+    private String verificationCode;
+    private boolean isRegistered;
+    
+    public User(String email, String username) {
+        this.email = email;
+        this.username = username;
+        this.isRegistered = false;
+    }
+    
+    public String getEmail() { return email; }
+    public void setEmail(String email) { this.email = email; }
+    
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+    
+    public String getPassword() { return password; }
+    public void setPassword(String password) { this.password = password; }
+    
+    public String getVerificationCode() { return verificationCode; }
+    public void setVerificationCode(String verificationCode) { 
+        this.verificationCode = verificationCode; 
+    }
+    
+    public boolean isRegistered() { return isRegistered; }
+    public void setRegistered(boolean registered) { isRegistered = registered; }
+    
+    @Override
+    public String toString() {
+        return "User{username='" + username + "', email='" + email + "', registered=" + isRegistered + "}";
+    }
+}

src/com/mathlearning/model/UserManager.java

@@ -0,0 +1,106 @@
+package com.mathlearning.model;
+
+import com.mathlearning.util.FileStorage;
+
+import java.util.Map;
+import java.util.HashMap;
+
+public class UserManager {
+    private static UserManager instance;
+    private Map<String, User> usersByEmail;  
+    private Map<String, User> usersByUsername; 
+    
+    private UserManager() {
+        this.usersByEmail = FileStorage.loadUsersByEmail();
+        this.usersByUsername = FileStorage.loadUsersByUsername();
+    }
+    
+    public static synchronized UserManager getInstance() {
+        if (instance == null) {
+            instance = new UserManager();
+        }
+        return instance;
+    }
+    
+    public void addUser(User user) {
+        usersByEmail.put(user.getEmail(), user);
+        usersByUsername.put(user.getUsername(), user);
+        FileStorage.saveUsers(usersByEmail, usersByUsername);
+    }
+    
+    public User getUserByEmail(String email) {
+        return usersByEmail.get(email);
+    }
+    
+    public User getUserByUsername(String username) {
+        return usersByUsername.get(username);
+    }
+    
+    public User getUser(String identifier) {
+        User user = usersByEmail.get(identifier);
+        if (user == null) {
+            user = usersByUsername.get(identifier);
+        }
+        return user;
+    }
+    
+    public boolean userExistsByEmail(String email) {
+        return usersByEmail.containsKey(email);
+    }
+    
+    public boolean userExistsByUsername(String username) {
+        return usersByUsername.containsKey(username);
+    }
+    
+    public boolean userExists(String identifier) {
+        return usersByEmail.containsKey(identifier) || usersByUsername.containsKey(identifier);
+    }
+    
+    public boolean verifyUser(String identifier, String password) {
+        User user = getUser(identifier);
+        return user != null && user.isRegistered() && 
+               password.equals(user.getPassword());
+    }
+    
+    public void saveUsers() {
+        FileStorage.saveUsers(usersByEmail, usersByUsername);
+    }
+    
+ 
+    public boolean isEmailAvailable(String email) {
+        User user = usersByEmail.get(email);
+        return user == null || !user.isRegistered();
+    }
+    
+ 
+    public boolean isUsernameAvailable(String username) {
+        User user = usersByUsername.get(username);
+        return user == null || !user.isRegistered();
+    }
+    
+ 
+    public void removeUnregisteredUser(String email) {
+        User user = usersByEmail.get(email);
+        if (user != null && !user.isRegistered()) {
+            usersByEmail.remove(email);
+            usersByUsername.remove(user.getUsername());
+            saveUsers();
+        }
+    }
+    
+ 
+    public int getUserCount() {
+        return usersByEmail.size();
+    }
+    
+
+    public int getRegisteredUserCount() {
+        int count = 0;
+        for (User user : usersByEmail.values()) {
+            if (user.isRegistered()) {
+                count++;
+            }
+        }
+        return count;
+    }
+}

src/com/mathlearning/util/EmailConfig.java

@@ -0,0 +1,58 @@
+package com.mathlearning.util;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class EmailConfig {
+    private static final String CONFIG_FILE = "email_config.properties";
+    private static Properties properties;
+    
+    static {
+        properties = new Properties();
+        try {
+            properties.load(new FileInputStream(CONFIG_FILE));
+        } catch (IOException e) {
+            System.out.println("未找到配置文件，使用默认邮箱配置（需要修改为您的真实邮箱）");
+            setDefaultProperties();
+        }
+    }
+    
+    private static void setDefaultProperties() {
+        properties.setProperty("email.from", "your-email@qq.com"); 
+        properties.setProperty("email.password", "your-authorization-code"); 
+        properties.setProperty("email.smtp.host", "smtp.qq.com"); 
+        properties.setProperty("email.smtp.port", "465"); 
+        properties.setProperty("email.smtp.ssl", "true"); 
+        properties.setProperty("email.smtp.auth", "true"); 
+    }
+    
+    public static String getFrom() {
+        return properties.getProperty("email.from");
+    }
+    
+    public static String getPassword() {
+        return properties.getProperty("email.password");
+    }
+    
+    public static String getSmtpHost() {
+        return properties.getProperty("email.smtp.host");
+    }
+    
+    public static String getSmtpPort() {
+        return properties.getProperty("email.smtp.port");
+    }
+    
+    public static boolean isSslEnabled() {
+        return "true".equals(properties.getProperty("email.smtp.ssl"));
+    }
+    
+    public static boolean isAuthEnabled() {
+        return "true".equals(properties.getProperty("email.smtp.auth"));
+    }
+    
+    public static boolean isConfigured() {
+        return !"your-email@qq.com".equals(getFrom()) && 
+               !"your-authorization-code".equals(getPassword());
+    }
+}

src/com/mathlearning/util/EmailUtil.java

@@ -0,0 +1,116 @@
+package com.mathlearning.util;
+
+import javax.mail.*;
+import javax.mail.internet.*;
+import javax.swing.JOptionPane;
+import java.util.Properties;
+import java.util.Random;
+
+public class EmailUtil {
+    private static final Random random = new Random();
+    
+  
+    public static String sendVerificationCode(String toEmail) {
+        if (!EmailConfig.isConfigured()) {
+            JOptionPane.showMessageDialog(null, 
+                "邮箱配置未完成！\n请修改 email_config.properties 文件，配置您的邮箱信息。", 
+                "配置错误", 
+                JOptionPane.ERROR_MESSAGE);
+            return null;
+        }
+        
+        String verificationCode = generateVerificationCode();
+        
+        try {
+            boolean sendSuccess = sendEmail(toEmail, verificationCode);
+            
+            if (sendSuccess) {
+                JOptionPane.showMessageDialog(
+                    null,
+                    "验证码已发送到您的邮箱！\n\n" +
+                    "收件邮箱: " + toEmail + "\n" +
+                    "请查看您的邮箱并输入验证码。",
+                    "验证码发送成功",
+                    JOptionPane.INFORMATION_MESSAGE
+                );
+                return verificationCode;
+            } else {
+                JOptionPane.showMessageDialog(null, 
+                    "验证码发送失败，请检查邮箱地址是否正确或稍后重试", 
+                    "发送失败", 
+                    JOptionPane.ERROR_MESSAGE);
+                return null;
+            }
+        } catch (Exception e) {
+            JOptionPane.showMessageDialog(null, 
+                "发送验证码时发生错误: " + e.getMessage(), 
+                "错误", 
+                JOptionPane.ERROR_MESSAGE);
+            return null;
+        }
+    }
+    
+   
+    private static boolean sendEmail(String toEmail, String verificationCode) {
+        Properties props = new Properties();
+        props.put("mail.smtp.host", EmailConfig.getSmtpHost());
+        props.put("mail.smtp.port", EmailConfig.getSmtpPort());
+        props.put("mail.smtp.auth", "true");
+        
+        if (EmailConfig.isSslEnabled()) {
+            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
+            props.put("mail.smtp.socketFactory.port", EmailConfig.getSmtpPort());
+        }
+        
+        Session session = Session.getInstance(props, new Authenticator() {
+            @Override
+            protected PasswordAuthentication getPasswordAuthentication() {
+                return new PasswordAuthentication(EmailConfig.getFrom(), EmailConfig.getPassword());
+            }
+        });
+        
+        try {
+            Message message = new MimeMessage(session);
+            message.setFrom(new InternetAddress(EmailConfig.getFrom()));
+            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail));
+            message.setSubject("数学学习软件 - 邮箱验证码");
+            
+            String emailContent = "尊敬的用户：\n\n" +
+                                "您正在注册数学学习软件，验证码为：" + verificationCode + "\n\n" +
+                                "验证码有效期为10分钟，请尽快完成注册。\n\n" +
+                                "如果不是您本人操作，请忽略此邮件。\n\n" +
+                                "数学学习软件团队";
+            
+            message.setText(emailContent);
+            
+            Transport.send(message);
+            System.out.println("验证码邮件已发送到: " + toEmail);
+            return true;
+            
+        } catch (MessagingException e) {
+            System.err.println("发送邮件失败: " + e.getMessage());
+            e.printStackTrace();
+            return false;
+        }
+    }
+    
+  
+    private static String generateVerificationCode() {
+        return String.format("%06d", random.nextInt(1000000));
+    }
+    
+    
+    public static boolean isValidEmail(String email) {
+        if (email == null || email.trim().isEmpty()) {
+            return false;
+        }
+        
+        String emailRegex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$";
+        return email.matches(emailRegex);
+    }
+    
+
+    public static String getEmailRequirements() {
+        return "请输入有效的邮箱地址，例如：username@example.com";
+    }
+}

src/com/mathlearning/util/ExamFileUtil.java

@@ -0,0 +1,71 @@
+package com.mathlearning.util;
+
+import com.mathlearning.model.Paper;
+import com.mathlearning.model.Question;
+
+import java.io.*;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class ExamFileUtil {
+    
+
+    public static boolean savePaperToFile(String username, Paper paper) {
+        File userDir = new File("exam_papers/" + username);
+        if (!userDir.exists()) {
+            if (!userDir.mkdirs()) {
+                System.err.println("无法创建用户文件夹: " + userDir.getAbsolutePath());
+                return false;
+            }
+        }
+        
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
+        String filename = timestamp + ".txt";
+        File file = new File(userDir, filename);
+        
+        try (PrintWriter writer = new PrintWriter(new FileWriter(file))) {
+            writer.println("试卷级别: " + paper.getLevel());
+            writer.println("生成时间: " + new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒").format(new Date()));
+            writer.println("题目数量: " + paper.getTotalQuestions());
+            writer.println();
+            
+            int questionNumber = 1;
+            for (Question question : paper.getQuestions()) {
+                writer.println(questionNumber + ". " + question.getContent());
+                
+                String[] options = question.getOptions();
+                for (int i = 0; i < options.length; i++) {
+                    writer.println("   " + (char)('A' + i) + ". " + options[i]);
+                }
+                
+                writer.println(); 
+                questionNumber++;
+            }
+            
+            writer.println("=== 参考答案 ===");
+            questionNumber = 1;
+            for (Question question : paper.getQuestions()) {
+                writer.println(questionNumber + ". " + question.getCorrectAnswer());
+                questionNumber++;
+            }
+            
+            System.out.println("试卷已保存到: " + file.getAbsolutePath());
+            return true;
+            
+        } catch (IOException e) {
+            System.err.println("保存试卷时出错: " + e.getMessage());
+            e.printStackTrace();
+            return false;
+        }
+    }
+    
+   
+    public static File[] getUserExamFiles(String username) {
+        File userDir = new File("exam_papers/" + username);
+        if (!userDir.exists()) {
+            return new File[0];
+        }
+        
+        return userDir.listFiles((dir, name) -> name.endsWith(".txt"));
+    }
+}

src/com/mathlearning/util/FileStorage.java

@@ -0,0 +1,50 @@
+package com.mathlearning.util;
+
+import com.mathlearning.model.User;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.Map;
+
+public class FileStorage {
+    private static final String USER_DATA_EMAIL_FILE = "users_email.dat";
+    private static final String USER_DATA_USERNAME_FILE = "users_username.dat";
+    
+    @SuppressWarnings("unchecked")
+    public static Map<String, User> loadUsersByEmail() {
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(USER_DATA_EMAIL_FILE))) {
+            return (Map<String, User>) ois.readObject();
+        } catch (FileNotFoundException e) {
+            return new HashMap<>();
+        } catch (IOException | ClassNotFoundException e) {
+            System.err.println("加载用户数据失败: " + e.getMessage());
+            return new HashMap<>();
+        }
+    }
+    
+    @SuppressWarnings("unchecked")
+    public static Map<String, User> loadUsersByUsername() {
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(USER_DATA_USERNAME_FILE))) {
+            return (Map<String, User>) ois.readObject();
+        } catch (FileNotFoundException e) {
+            return new HashMap<>();
+        } catch (IOException | ClassNotFoundException e) {
+            System.err.println("加载用户数据失败: " + e.getMessage());
+            return new HashMap<>();
+        }
+    }
+    
+    public static void saveUsers(Map<String, User> usersByEmail, Map<String, User> usersByUsername) {
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(USER_DATA_EMAIL_FILE))) {
+            oos.writeObject(usersByEmail);
+        } catch (IOException e) {
+            System.err.println("保存用户数据失败: " + e.getMessage());
+        }
+        
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(USER_DATA_USERNAME_FILE))) {
+            oos.writeObject(usersByUsername);
+        } catch (IOException e) {
+            System.err.println("保存用户数据失败: " + e.getMessage());
+        }
+    }
+}

src/com/mathlearning/util/PasswordValidator.java

@@ -0,0 +1,21 @@
+package com.mathlearning.util;
+
+public class PasswordValidator {
+    public static boolean isValid(String password) {
+        if (password == null || password.length() < 6 || password.length() > 10) {
+            return false;
+        }
+        
+        boolean hasUpperCase = false;
+        boolean hasLowerCase = false;
+        boolean hasDigit = false;
+        
+        for (char c : password.toCharArray()) {
+            if (Character.isUpperCase(c)) hasUpperCase = true;
+            if (Character.isLowerCase(c)) hasLowerCase = true;
+            if (Character.isDigit(c)) hasDigit = true;
+        }
+        
+        return hasUpperCase && hasLowerCase && hasDigit;
+    }
+}

src/com/mathlearning/util/UsernameValidator.java

@@ -0,0 +1,15 @@
+package com.mathlearning.util;
+
+public class UsernameValidator {
+    public static boolean isValid(String username) {
+        if (username == null || username.length() < 3 || username.length() > 20) {
+            return false;
+        }
+        
+        return username.matches("^[a-zA-Z0-9_]+$");
+    }
+    
+    public static String getRequirements() {
+        return "用户名要求: 3-20位，只能包含字母、数字和下划线";
+    }
+}

src/com/mathlearning/view/ExamView.java

@@ -0,0 +1,363 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.ExamController;
+import com.mathlearning.controller.NavigationController;
+import com.mathlearning.model.Question;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+public class ExamView extends JPanel {
+    private NavigationController navigationController;
+    private ExamController examController;
+    private String userIdentifier;
+    private String email;
+    private String level;
+    private int questionCount;
+    
+    private JLabel questionNumberLabel;
+    private JLabel questionContentLabel;
+    private ButtonGroup optionsGroup;
+    private JRadioButton[] optionButtons;
+    private JButton previousButton;
+    private JButton nextButton;
+    private JButton submitButton;
+    private JProgressBar progressBar;
+    private JLabel statusLabel;
+    private JButton cancelButton;
+    
+    private int generationProgress = 0;
+    
+    public ExamView(NavigationController navigationController, String userIdentifier, String email, String level, int questionCount) {
+        this.navigationController = navigationController;
+        this.userIdentifier = userIdentifier;
+        this.email = email;
+        this.level = level;
+        this.questionCount = questionCount;
+        this.examController = new ExamController();
+        this.examController.setCurrentUser(userIdentifier);
+        
+        initializeUI();
+        startExamGeneration();
+    }
+    
+    private void initializeUI() {
+        setLayout(new BorderLayout(10, 10));
+        
+        JPanel infoPanel = new JPanel(new BorderLayout());
+        String userInfo = "用户: " + userIdentifier;
+        if (!userIdentifier.equals(email)) {
+            userInfo += " (" + email + ")";
+        }
+        JLabel userInfoLabel = new JLabel(userInfo, JLabel.LEFT);
+        userInfoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        infoPanel.add(userInfoLabel, BorderLayout.WEST);
+        
+        JLabel levelLabel = new JLabel(level + "数学", JLabel.RIGHT);
+        levelLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        infoPanel.add(levelLabel, BorderLayout.EAST);
+        
+        add(infoPanel, BorderLayout.NORTH);
+        
+        JPanel progressPanel = new JPanel(new BorderLayout());
+        progressPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
+        
+        statusLabel = new JLabel("正在生成试卷，请稍候...", JLabel.CENTER);
+        statusLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16));
+        progressPanel.add(statusLabel, BorderLayout.NORTH);
+        
+        progressBar = new JProgressBar();
+        progressBar.setIndeterminate(true);
+        progressBar.setPreferredSize(new Dimension(300, 20));
+        progressPanel.add(progressBar, BorderLayout.CENTER);
+        
+        JPanel buttonPanel = new JPanel();
+        cancelButton = new JButton("取消生成");
+        cancelButton.addActionListener(e -> {
+            navigationController.showQuestionCountView(level);
+        });
+        buttonPanel.add(cancelButton);
+        progressPanel.add(buttonPanel, BorderLayout.SOUTH);
+        
+        add(progressPanel, BorderLayout.CENTER);
+    }
+    
+    private void startExamGeneration() {
+        System.out.println("开始生成试卷，级别: " + level + ", 题目数量: " + questionCount);
+        
+        SwingWorker<Boolean, String> worker = new SwingWorker<Boolean, String>() {
+            @Override
+            protected Boolean doInBackground() throws Exception {
+                publish("正在初始化生成器...");
+                Thread.sleep(100); 
+                
+                try {
+                    publish("开始生成题目...");
+                    long startTime = System.currentTimeMillis();
+                    
+                    SwingUtilities.invokeLater(() -> {
+                        progressBar.setIndeterminate(false);
+                        progressBar.setMinimum(0);
+                        progressBar.setMaximum(100);
+                        progressBar.setValue(0);
+                    });
+                    
+                    for (int i = 0; i <= 100; i += 10) {
+                        if (isCancelled()) {
+                            return false;
+                        }
+                        publish("生成题目中... " + i + "%");
+                        progressBar.setValue(i);
+                        Thread.sleep(50);
+                    }
+                    
+                    examController.createExam(level, questionCount);
+                    
+                    long endTime = System.currentTimeMillis();
+                    publish("题目生成完成，耗时: " + (endTime - startTime) + "ms");
+                    
+                    return true;
+                } catch (Exception e) {
+                    System.err.println("生成题目时出错: " + e.getMessage());
+                    e.printStackTrace();
+                    publish("生成题目时出错: " + e.getMessage());
+                    return false;
+                }
+            }
+            
+            @Override
+            protected void process(List<String> chunks) {
+                if (!chunks.isEmpty()) {
+                    String latestMessage = chunks.get(chunks.size() - 1);
+                    statusLabel.setText(latestMessage);
+                    
+                    if (latestMessage.contains("%")) {
+                        progressBar.setString(latestMessage);
+                        progressBar.setStringPainted(true);
+                    }
+                }
+            }
+            
+            @Override
+            protected void done() {
+                try {
+                    Boolean success = get();
+                    if (success) {
+                        statusLabel.setText("题目生成成功！正在加载界面...");
+                        progressBar.setValue(100);
+                        
+                        Timer timer = new Timer(500, e -> {
+                            initializeExamUI();
+                            loadQuestion();
+                        });
+                        timer.setRepeats(false);
+                        timer.start();
+                    } else {
+                        JOptionPane.showMessageDialog(ExamView.this, 
+                            "生成试卷失败，将使用基础题目继续考试", 
+                            "生成失败", 
+                            JOptionPane.WARNING_MESSAGE);
+                        
+                        initializeExamUI();
+                        loadQuestion();
+                    }
+                } catch (InterruptedException e) {
+                    navigationController.showQuestionCountView(level);
+                } catch (ExecutionException e) {
+                    e.printStackTrace();
+                    JOptionPane.showMessageDialog(ExamView.this, 
+                        "生成试卷时发生错误: " + e.getCause().getMessage(), 
+                        "错误", 
+                        JOptionPane.ERROR_MESSAGE);
+                    navigationController.showQuestionCountView(level);
+                }
+            }
+        };
+        
+        worker.execute();
+    }
+    
+    private void initializeExamUI() {
+        removeAll();
+        setLayout(new BorderLayout(10, 10));
+        
+        JPanel headerPanel = new JPanel(new BorderLayout());
+        questionNumberLabel = new JLabel("", JLabel.CENTER);
+        questionNumberLabel.setFont(new Font("微软雅黑", Font.BOLD, 16));
+        headerPanel.add(questionNumberLabel, BorderLayout.CENTER);
+        
+        JLabel levelLabel = new JLabel(level + "数学", JLabel.RIGHT);
+        levelLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
+        headerPanel.add(levelLabel, BorderLayout.EAST);
+        
+        add(headerPanel, BorderLayout.NORTH);
+        
+        JPanel questionPanel = new JPanel(new BorderLayout(10, 10));
+        questionPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
+        
+        questionContentLabel = new JLabel("", JLabel.CENTER);
+        questionContentLabel.setFont(new Font("微软雅黑", Font.PLAIN, 18));
+        questionPanel.add(questionContentLabel, BorderLayout.NORTH);
+        
+        JPanel optionsPanel = new JPanel(new GridLayout(4, 1, 10, 10));
+        optionsGroup = new ButtonGroup();
+        optionButtons = new JRadioButton[4];
+        
+        for (int i = 0; i < 4; i++) {
+            optionButtons[i] = new JRadioButton();
+            optionButtons[i].setFont(new Font("微软雅黑", Font.PLAIN, 16));
+            final int index = i;
+            optionButtons[i].addActionListener(e -> {
+                if (optionButtons[index].isSelected()) {
+                    saveCurrentAnswer();
+                }
+            });
+            optionsGroup.add(optionButtons[i]);
+            optionsPanel.add(optionButtons[i]);
+        }
+        
+        questionPanel.add(optionsPanel, BorderLayout.CENTER);
+        add(questionPanel, BorderLayout.CENTER);
+        
+        JPanel navPanel = new JPanel(new FlowLayout());
+        
+        previousButton = new JButton("上一题");
+        previousButton.addActionListener(e -> handlePrevious());
+        navPanel.add(previousButton);
+        
+        nextButton = new JButton("下一题");
+        nextButton.addActionListener(e -> handleNext());
+        navPanel.add(nextButton);
+        
+        submitButton = new JButton("提交试卷");
+        submitButton.addActionListener(e -> handleSubmit());
+        navPanel.add(submitButton);
+        
+        JButton backButton = new JButton("返回");
+        backButton.addActionListener(e -> {
+            int result = JOptionPane.showConfirmDialog(ExamView.this, 
+                "确定要返回吗？当前进度将丢失。", 
+                "确认返回", 
+                JOptionPane.YES_NO_OPTION);
+                
+            if (result == JOptionPane.YES_OPTION) {
+                navigationController.showQuestionCountView(level);
+            }
+        });
+        navPanel.add(backButton);
+        
+        add(navPanel, BorderLayout.SOUTH);
+        
+        updateNavigationButtons();
+        revalidate();
+        repaint();
+    }
+    
+    private void loadQuestion() {
+        Question currentQuestion = examController.getCurrentQuestion();
+        if (currentQuestion != null) {
+            questionNumberLabel.setText("第 " + examController.getCurrentQuestionNumber() + " 题 / 共 " + 
+                                      examController.getTotalQuestions() + " 题");
+            
+            questionContentLabel.setText("<html><div style='text-align: center;'>" + currentQuestion.getContent() + "</div></html>");
+            
+            optionsGroup.clearSelection();
+            
+            String[] options = currentQuestion.getOptions();
+            for (int i = 0; i < 4; i++) {
+                if (i < options.length) {
+                    optionButtons[i].setText((char)('A' + i) + ". " + options[i]);
+                    optionButtons[i].setVisible(true);
+                } else {
+                    optionButtons[i].setText(""); 
+                    optionButtons[i].setVisible(false);
+                }
+            }
+            
+            String userAnswer = currentQuestion.getUserAnswer();
+            if (userAnswer != null && !userAnswer.trim().isEmpty()) {
+                for (int i = 0; i < 4; i++) {
+                    if (optionButtons[i].isVisible() && optionButtons[i].getText().contains(userAnswer)) {
+                        optionButtons[i].setSelected(true);
+                        break;
+                    }
+                }
+            }
+        } else {
+            questionContentLabel.setText("<html><div style='text-align: center; color: red;'>题目加载失败，请返回重试</div></html>");
+        }
+        
+        updateNavigationButtons();
+    }
+    
+    private void handlePrevious() {
+        saveCurrentAnswer();
+        examController.previousQuestion();
+        loadQuestion();
+    }
+    
+    private void handleNext() {
+        saveCurrentAnswer();
+        examController.nextQuestion();
+        loadQuestion();
+    }
+    
+    private void handleSubmit() {
+        saveCurrentAnswer();
+        
+        int result = JOptionPane.showConfirmDialog(this, 
+            "确认提交试卷？提交后将显示成绩并保存试卷。", 
+            "确认提交", 
+            JOptionPane.YES_NO_OPTION);
+            
+        if (result == JOptionPane.YES_OPTION) {
+            boolean saveSuccess = examController.saveCurrentPaper();
+            
+            int score = examController.calculateScore();
+            int totalQuestions = examController.getTotalQuestions();
+            
+            if (saveSuccess) {
+                JOptionPane.showMessageDialog(this, 
+                    "试卷已保存到您的文件夹中！", 
+                    "保存成功", 
+                    JOptionPane.INFORMATION_MESSAGE);
+            } else {
+                JOptionPane.showMessageDialog(this, 
+                    "试卷保存失败，但成绩计算完成。", 
+                    "保存失败", 
+                    JOptionPane.WARNING_MESSAGE);
+            }
+            
+            navigationController.showScoreView(level, score, totalQuestions);
+        }
+    }
+    
+    private void saveCurrentAnswer() {
+        for (int i = 0; i < 4; i++) {
+            if (optionButtons[i].isSelected() && optionButtons[i].isVisible()) {
+                try {
+                    String fullText = optionButtons[i].getText();
+                    String answer = fullText.substring(fullText.indexOf(". ") + 2);
+                    examController.submitAnswer(answer);
+                    System.out.println("保存答案: " + answer);
+                    break;
+                } catch (Exception e) {
+                    System.err.println("保存答案时出错: " + e.getMessage());
+                }
+            }
+        }
+    }
+    
+    private void updateNavigationButtons() {
+        boolean hasPrevious = examController.hasPreviousQuestion();
+        boolean hasNext = examController.hasNextQuestion();
+        
+        previousButton.setEnabled(hasPrevious);
+        nextButton.setEnabled(hasNext);
+        submitButton.setEnabled(!hasNext); 
+        
+        System.out.println("导航按钮状态 - 上一题: " + hasPrevious + ", 下一题: " + hasNext + ", 提交: " + !hasNext);
+    }
+}

src/com/mathlearning/view/LevelSelectionView.java

@@ -0,0 +1,69 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.NavigationController;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class LevelSelectionView extends JPanel {
+    private NavigationController navigationController;
+    private String userIdentifier;
+    private String email;
+    
+    private JButton primaryButton;
+    private JButton middleButton;
+    private JButton highButton;
+    private JButton logoutButton;
+    
+    public LevelSelectionView(NavigationController navigationController, String userIdentifier, String email) {
+        this.navigationController = navigationController;
+        this.userIdentifier = userIdentifier;
+        this.email = email;
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(15, 15, 15, 15);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel("选择学习阶段", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 24));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridy = 1;
+        String userInfo = "当前用户: " + userIdentifier;
+        if (!userIdentifier.equals(email)) {
+            userInfo += " (" + email + ")";
+        }
+        JLabel userLabel = new JLabel(userInfo, JLabel.CENTER);
+        userLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
+        add(userLabel, gbc);
+        
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 2;
+        primaryButton = new JButton("小学");
+        primaryButton.setFont(new Font("微软雅黑", Font.PLAIN, 18));
+        primaryButton.addActionListener(e -> navigationController.showQuestionCountView("小学"));
+        add(primaryButton, gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 2;
+        middleButton = new JButton("初中");
+        middleButton.setFont(new Font("微软雅黑", Font.PLAIN, 18));
+        middleButton.addActionListener(e -> navigationController.showQuestionCountView("初中"));
+        add(middleButton, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 3; gbc.gridwidth = 2;
+        highButton = new JButton("高中");
+        highButton.setFont(new Font("微软雅黑", Font.PLAIN, 18));
+        highButton.addActionListener(e -> navigationController.showQuestionCountView("高中"));
+        add(highButton, gbc);
+        
+        gbc.gridy = 4;
+        logoutButton = new JButton("退出登录");
+        logoutButton.addActionListener(e -> navigationController.showLoginView());
+        add(logoutButton, gbc);
+    }
+}

src/com/mathlearning/view/LoginView.java

@@ -0,0 +1,101 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.AuthController;
+import com.mathlearning.controller.NavigationController;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class LoginView extends JPanel {
+    private NavigationController navigationController;
+    private AuthController authController;
+    
+    private JTextField identifierField; 
+    private JPasswordField passwordField;
+    private JButton loginButton;
+    private JButton registerButton;
+    private JButton changePasswordButton;
+    private JLabel identifierLabel;
+    
+    public LoginView(NavigationController navigationController) {
+        this.navigationController = navigationController;
+        this.authController = new AuthController();
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(10, 10, 10, 10);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel("数学学习软件", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 24));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 1;
+        identifierLabel = new JLabel("用户名/邮箱:");
+        add(identifierLabel, gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 1;
+        identifierField = new JTextField(20);
+        add(identifierField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 2;
+        add(new JLabel("密码:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 2;
+        passwordField = new JPasswordField(20);
+        add(passwordField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 3; gbc.gridwidth = 2;
+        loginButton = new JButton("登录");
+        loginButton.addActionListener(e -> handleLogin());
+        add(loginButton, gbc);
+        
+        gbc.gridy = 4;
+        registerButton = new JButton("注册新账号");
+        registerButton.addActionListener(e -> navigationController.showRegisterView());
+        add(registerButton, gbc);
+        
+        gbc.gridy = 5;
+        changePasswordButton = new JButton("修改密码");
+        changePasswordButton.addActionListener(e -> handleChangePassword());
+        add(changePasswordButton, gbc);
+        
+        gbc.gridy = 6;
+        JLabel hintLabel = new JLabel("提示: 可以使用用户名或邮箱登录", JLabel.CENTER);
+        hintLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        hintLabel.setForeground(Color.GRAY);
+        add(hintLabel, gbc);
+    }
+    
+    private void handleLogin() {
+        String identifier = identifierField.getText().trim();
+        String password = new String(passwordField.getPassword());
+        
+        if (identifier.isEmpty() || password.isEmpty()) {
+            JOptionPane.showMessageDialog(this, "请输入用户名/邮箱和密码", "错误", JOptionPane.ERROR_MESSAGE);
+            return;
+        }
+        
+        if (authController.login(identifier, password)) {
+            String email = authController.getUserEmail(identifier);
+            navigationController.showLevelSelectionView(identifier, email);
+        } else {
+            JOptionPane.showMessageDialog(this, "用户名/邮箱或密码错误", "登录失败", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+    
+    private void handleChangePassword() {
+        String identifier = identifierField.getText().trim();
+        if (identifier.isEmpty()) {
+            JOptionPane.showMessageDialog(this, "请输入用户名/邮箱", "错误", JOptionPane.ERROR_MESSAGE);
+            return;
+        }
+        
+        navigationController.showChangePasswordView(identifier);
+    }
+}

src/com/mathlearning/view/QuestionCountView.java

@@ -0,0 +1,79 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.NavigationController;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class QuestionCountView extends JPanel {
+    private NavigationController navigationController;
+    private String userIdentifier;
+    private String email;
+    private String level;
+    
+    private JTextField countField;
+    private JButton submitButton;
+    private JButton backButton;
+    
+    public QuestionCountView(NavigationController navigationController, String userIdentifier, String email, String level) {
+        this.navigationController = navigationController;
+        this.userIdentifier = userIdentifier;
+        this.email = email;
+        this.level = level;
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(10, 10, 10, 10);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel(level + "数学题目生成", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 20));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridy = 1;
+        String userInfo = "当前用户: " + userIdentifier;
+        if (!userIdentifier.equals(email)) {
+            userInfo += " (" + email + ")";
+        }
+        JLabel userLabel = new JLabel(userInfo, JLabel.CENTER);
+        userLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        add(userLabel, gbc);
+        
+        gbc.gridy = 2;
+        JLabel instructionLabel = new JLabel("请输入要生成的题目数量 (10-30):", JLabel.CENTER);
+        add(instructionLabel, gbc);
+        
+        gbc.gridy = 3;
+        countField = new JTextField(10);
+        countField.setHorizontalAlignment(JTextField.CENTER);
+        add(countField, gbc);
+        
+        gbc.gridy = 4;
+        submitButton = new JButton("生成试卷");
+        submitButton.addActionListener(e -> handleSubmit());
+        add(submitButton, gbc);
+        
+        gbc.gridy = 5;
+        backButton = new JButton("返回");
+        backButton.addActionListener(e -> navigationController.showLevelSelectionView(userIdentifier, email));
+        add(backButton, gbc);
+    }
+    
+    private void handleSubmit() {
+        try {
+            int count = Integer.parseInt(countField.getText().trim());
+            if (count < 10 || count > 30) {
+                JOptionPane.showMessageDialog(this, "请输入10-30之间的数字", "错误", JOptionPane.ERROR_MESSAGE);
+                return;
+            }
+            
+            navigationController.showExamView(level, count);
+        } catch (NumberFormatException e) {
+            JOptionPane.showMessageDialog(this, "请输入有效的数字", "错误", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+}

src/com/mathlearning/view/RegisterView.java

@@ -0,0 +1,194 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.AuthController;
+import com.mathlearning.controller.NavigationController;
+import com.mathlearning.util.EmailUtil;
+import com.mathlearning.util.UsernameValidator;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class RegisterView extends JPanel {
+    private NavigationController navigationController;
+    private AuthController authController;
+    
+    private JTextField emailField;
+    private JTextField usernameField;
+    private JButton sendCodeButton;
+    private JButton verifyButton;
+    private JButton backButton;
+    private JLabel statusLabel;
+    private JTextField codeField;
+    private String currentVerificationCode;
+    
+    public RegisterView(NavigationController navigationController) {
+        this.navigationController = navigationController;
+        this.authController = new AuthController();
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(10, 10, 10, 10);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel("用户注册", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 20));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 1;
+        add(new JLabel("用户名:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 1;
+        usernameField = new JTextField(20);
+        add(usernameField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 2;
+        add(new JLabel("邮箱地址:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 2;
+        emailField = new JTextField(20);
+        add(emailField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 3;
+        add(new JLabel("验证码:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 3;
+        JPanel codePanel = new JPanel(new BorderLayout());
+        codeField = new JTextField(10);
+        codePanel.add(codeField, BorderLayout.CENTER);
+        
+        sendCodeButton = new JButton("发送验证码");
+        sendCodeButton.addActionListener(e -> handleSendCode());
+        codePanel.add(sendCodeButton, BorderLayout.EAST);
+        
+        add(codePanel, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 4; gbc.gridwidth = 2;
+        JLabel usernameReqLabel = new JLabel(UsernameValidator.getRequirements(), JLabel.CENTER);
+        usernameReqLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        usernameReqLabel.setForeground(Color.GRAY);
+        add(usernameReqLabel, gbc);
+        
+        gbc.gridy = 5;
+        JLabel emailReqLabel = new JLabel(EmailUtil.getEmailRequirements(), JLabel.CENTER);
+        emailReqLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        emailReqLabel.setForeground(Color.GRAY);
+        add(emailReqLabel, gbc);
+        
+        gbc.gridy = 6;
+        statusLabel = new JLabel("", JLabel.CENTER);
+        statusLabel.setForeground(Color.BLUE);
+        add(statusLabel, gbc);
+        
+        gbc.gridy = 7;
+        verifyButton = new JButton("验证并继续");
+        verifyButton.addActionListener(e -> handleVerify());
+        add(verifyButton, gbc);
+        
+        gbc.gridy = 8;
+        backButton = new JButton("返回登录");
+        backButton.addActionListener(e -> navigationController.showLoginView());
+        add(backButton, gbc);
+    }
+    
+    private void handleSendCode() {
+        String email = emailField.getText().trim();
+        String username = usernameField.getText().trim();
+        
+        if (username.isEmpty() || email.isEmpty()) {
+            showError("请输入用户名和邮箱地址");
+            return;
+        }
+        
+        if (!EmailUtil.isValidEmail(email)) {
+            showError("请输入有效的邮箱地址");
+            return;
+        }
+        
+        if (!UsernameValidator.isValid(username)) {
+            showError(UsernameValidator.getRequirements());
+            return;
+        }
+        
+        if (!authController.isEmailAvailable(email)) {
+            showError("该邮箱已被注册");
+            return;
+        }
+        
+        if (!authController.isUsernameAvailable(username)) {
+            showError("该用户名已被使用");
+            return;
+        }
+        
+        sendCodeButton.setEnabled(false);
+        sendCodeButton.setText("发送中...");
+        statusLabel.setText("正在发送验证码，请稍候...");
+        statusLabel.setForeground(Color.BLUE);
+        
+        SwingWorker<String, Void> worker = new SwingWorker<String, Void>() {
+            @Override
+            protected String doInBackground() throws Exception {
+                return authController.sendVerificationCode(email, username);
+            }
+            
+            @Override
+            protected void done() {
+                try {
+                    currentVerificationCode = get();
+                    if (currentVerificationCode != null) {
+                        statusLabel.setText("验证码已发送！请在下方输入验证码");
+                        statusLabel.setForeground(Color.GREEN);
+                        codeField.setEnabled(true);
+                        verifyButton.setEnabled(true);
+                    } else {
+                        showError("发送验证码失败，请检查邮箱地址或稍后重试");
+                    }
+                } catch (Exception e) {
+                    showError("发送验证码时发生错误: " + e.getMessage());
+                } finally {
+                    sendCodeButton.setEnabled(true);
+                    sendCodeButton.setText("发送验证码");
+                }
+            }
+        };
+        
+        worker.execute();
+    }
+    
+    private void handleVerify() {
+        String email = emailField.getText().trim();
+        String username = usernameField.getText().trim();
+        String code = codeField.getText().trim();
+        
+        if (code.isEmpty()) {
+            showError("请输入验证码");
+            return;
+        }
+        
+        if (currentVerificationCode != null && code.equals(currentVerificationCode)) {
+            boolean success = authController.createUnregisteredUser(email, username, currentVerificationCode);
+            if (success) {
+                showSuccess("验证成功！");
+                navigationController.showSetPasswordView(email, currentVerificationCode);
+            } else {
+                showError("创建用户失败");
+            }
+        } else {
+            showError("验证码错误，请重新输入");
+        }
+    }
+    
+    private void showError(String message) {
+        statusLabel.setText(message);
+        statusLabel.setForeground(Color.RED);
+    }
+    
+    private void showSuccess(String message) {
+        statusLabel.setText(message);
+        statusLabel.setForeground(Color.GREEN);
+    }
+}

src/com/mathlearning/view/ScoreView.java

@@ -0,0 +1,102 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.NavigationController;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class ScoreView extends JPanel {
+    private NavigationController navigationController;
+    private String userIdentifier;
+    private String email;
+    private String level;
+    private int score;
+    private int totalQuestions;
+    
+    private JLabel scoreLabel;
+    private JLabel commentLabel;
+    private JButton retryButton;
+    private JButton newExamButton;
+    private JButton logoutButton;
+    
+    public ScoreView(NavigationController navigationController, String userIdentifier, String email, String level, int score, int totalQuestions) {
+        this.navigationController = navigationController;
+        this.userIdentifier = userIdentifier;
+        this.email = email;
+        this.level = level;
+        this.score = score;
+        this.totalQuestions = totalQuestions;
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(15, 15, 15, 15);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel("考试结果", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 24));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridy = 1;
+        String userInfo = "用户: " + userIdentifier;
+        if (!userIdentifier.equals(email)) {
+            userInfo += " (" + email + ")";
+        }
+        JLabel userLabel = new JLabel(userInfo, JLabel.CENTER);
+        userLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        add(userLabel, gbc);
+        
+        gbc.gridy = 2;
+        JLabel levelLabel = new JLabel("级别: " + level, JLabel.CENTER);
+        levelLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        add(levelLabel, gbc);
+        
+        gbc.gridy = 3;
+        scoreLabel = new JLabel("得分: " + score + " / 100", JLabel.CENTER);
+        scoreLabel.setFont(new Font("微软雅黑", Font.BOLD, 20));
+        scoreLabel.setForeground(getScoreColor());
+        add(scoreLabel, gbc);
+        
+        gbc.gridy = 4;
+        commentLabel = new JLabel(getScoreComment(), JLabel.CENTER);
+        commentLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16));
+        add(commentLabel, gbc);
+        
+        gbc.gridy = 5;
+        int correctCount = (score * totalQuestions) / 100;
+        JLabel statsLabel = new JLabel("正确题数: " + correctCount + " / " + totalQuestions, JLabel.CENTER);
+        statsLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
+        add(statsLabel, gbc);
+        
+        gbc.gridy = 6;
+        retryButton = new JButton("重新答题");
+        retryButton.addActionListener(e -> navigationController.showExamView(level, totalQuestions));
+        add(retryButton, gbc);
+        
+        gbc.gridy = 7;
+        newExamButton = new JButton("新的测试");
+        newExamButton.addActionListener(e -> navigationController.showLevelSelectionView(userIdentifier, email));
+        add(newExamButton, gbc);
+        
+        gbc.gridy = 8;
+        logoutButton = new JButton("退出登录");
+        logoutButton.addActionListener(e -> navigationController.showLoginView());
+        add(logoutButton, gbc);
+    }
+    
+    private Color getScoreColor() {
+        if (score >= 80) return new Color(0, 128, 0); // 绿色
+        if (score >= 60) return new Color(255, 165, 0); // 橙色
+        return Color.RED;
+    }
+    
+    private String getScoreComment() {
+        if (score >= 90) return "优秀！继续保持！";
+        if (score >= 80) return "良好！还有进步空间！";
+        if (score >= 60) return "及格！需要多加练习！";
+        return "不及格！需要认真学习！";
+    }
+}

src/com/mathlearning/view/SetPasswordView.java

@@ -0,0 +1,92 @@
+package com.mathlearning.view;
+
+import com.mathlearning.controller.AuthController;
+import com.mathlearning.controller.NavigationController;
+import com.mathlearning.util.PasswordValidator;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class SetPasswordView extends JPanel {
+    private NavigationController navigationController;
+    private AuthController authController;
+    private String email;
+    
+    private JPasswordField passwordField;
+    private JPasswordField confirmPasswordField;
+    private JButton submitButton;
+    private JButton backButton;
+    
+    public SetPasswordView(NavigationController navigationController, String email, String verificationCode) {
+        this.navigationController = navigationController;
+        this.authController = new AuthController();
+        this.email = email;
+        initializeUI();
+    }
+    
+    private void initializeUI() {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(10, 10, 10, 10);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        
+        JLabel titleLabel = new JLabel("设置密码", JLabel.CENTER);
+        titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 20));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(titleLabel, gbc);
+        
+        gbc.gridy = 1;
+        JLabel userInfoLabel = new JLabel("邮箱: " + email, JLabel.CENTER);
+        userInfoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        add(userInfoLabel, gbc);
+        
+        gbc.gridy = 2;
+        JLabel requirementsLabel = new JLabel("密码要求: 6-10位，包含大小写字母和数字", JLabel.CENTER);
+        requirementsLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
+        add(requirementsLabel, gbc);
+        
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 3;
+        add(new JLabel("密码:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 3;
+        passwordField = new JPasswordField(20);
+        add(passwordField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 4;
+        add(new JLabel("确认密码:"), gbc);
+        
+        gbc.gridx = 1; gbc.gridy = 4;
+        confirmPasswordField = new JPasswordField(20);
+        add(confirmPasswordField, gbc);
+        
+        gbc.gridx = 0; gbc.gridy = 5; gbc.gridwidth = 2;
+        submitButton = new JButton("设置密码");
+        submitButton.addActionListener(e -> handleSetPassword());
+        add(submitButton, gbc);
+        
+        gbc.gridy = 6;
+        backButton = new JButton("返回");
+        backButton.addActionListener(e -> navigationController.showLoginView());
+        add(backButton, gbc);
+    }
+    
+    private void handleSetPassword() {
+        String password = new String(passwordField.getPassword());
+        String confirmPassword = new String(confirmPasswordField.getPassword());
+        
+        if (!PasswordValidator.isValid(password)) {
+            JOptionPane.showMessageDialog(this, 
+                "密码不符合要求！\n请确保密码：\n- 长度6-10位\n- 包含大写字母\n- 包含小写字母\n- 包含数字", 
+                "密码错误", JOptionPane.ERROR_MESSAGE);
+            return;
+        }
+        
+        if (authController.setPassword(email, password, confirmPassword)) {
+            JOptionPane.showMessageDialog(this, "密码设置成功！", "成功", JOptionPane.INFORMATION_MESSAGE);
+            navigationController.showLevelSelectionView(email, email);
+        } else {
+            JOptionPane.showMessageDialog(this, "密码设置失败，请检查输入", "错误", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+}

src/email_config.properties.txt

@@ -0,0 +1,5 @@
+email.from=1393110457@qq.com
+email.password=yuslygpkwwbtfedh
+email.smtp.host=smtp.qq.com
+email.smtp.port=465
+email.smtp.ssl=true

src/exam_papers/wjw/2025-10-11-13-29-32.txt

@@ -0,0 +1,145 @@
+试卷级别: 小学
+生成时间: 2025年10月11日 13时29分32秒
+题目数量: 20
+
+1. 21 - 4 + 70 = ?
+   A. 75
+   B. 87
+   C. 72
+   D. 101
+
+2. 76 - 32 + 23 - 21 = ?
+   A. 39
+   B. 38
+   C. 46
+   D. 53
+
+3. 64 + 86 + 25 × 21 = ?
+   A. 675
+   B. 792
+   C. 628
+   D. 771
+
+4. 8 + 75 + 74 + 81 = ?
+   A. 238
+   B. 198
+   C. 241
+   D. 244
+
+5. 79 - 6 + 86 = ?
+   A. 159
+   B. 138
+   C. 137
+   D. 185
+
+6. 85 + 9 - 24 = ?
+   A. 73
+   B. 70
+   C. 58
+   D. 78
+
+7. 91 + 20 + 42 = ?
+   A. 134
+   B. 125
+   C. 143
+   D. 153
+
+8. 11 + 71 × 8 + 52 = ?
+   A. 675
+   B. 631
+   C. 601
+   D. 511
+
+9. 64 + 54 - 75 = ?
+   A. 43
+   B. 44
+   C. 39
+   D. 38
+
+10. 30 + 85 - 42 = ?
+   A. 84
+   B. 64
+   C. 58
+   D. 73
+
+11. 22 + 94 + 89 - 97 = ?
+   A. 108
+   B. 88
+   C. 105
+   D. 94
+
+12. 62 + 27 - 21 = ?
+   A. 70
+   B. 68
+   C. 63
+   D. 79
+
+13. 74 + 17 - 5 = ?
+   A. 85
+   B. 86
+   C. 92
+   D. 90
+
+14. 94 - 6 + 61 = ?
+   A. 120
+   B. 135
+   C. 149
+   D. 121
+
+15. 89 + 77 + 60 + 26 = ?
+   A. 227
+   B. 291
+   C. 299
+   D. 252
+
+16. 100 + 22 - 50 = ?
+   A. 86
+   B. 72
+   C. 84
+   D. 80
+
+17. 69 ÷ 1 + 92 = ?
+   A. 129
+   B. 161
+   C. 135
+   D. 146
+
+18. 98 + 44 + 97 × 4 = ?
+   A. 530
+   B. 463
+   C. 482
+   D. 433
+
+19. 98 + 80 - 68 = ?
+   A. 107
+   B. 110
+   C. 119
+   D. 127
+
+20. 32 + 5 × 36 = ?
+   A. 243
+   B. 179
+   C. 240
+   D. 212
+
+=== 参考答案 ===
+1. 87
+2. 46
+3. 675
+4. 238
+5. 159
+6. 70
+7. 153
+8. 631
+9. 43
+10. 73
+11. 108
+12. 68
+13. 86
+14. 149
+15. 252
+16. 72
+17. 161
+18. 530
+19. 110
+20. 212

src/exam_papers/wjw/2025-10-11-13-29-45.txt

@@ -0,0 +1,75 @@
+试卷级别: 初中
+生成时间: 2025年10月11日 13时29分45秒
+题目数量: 10
+
+1. 64² = ?
+   A. 4468
+   B. 4122
+   C. 4256
+   D. 4096
+
+2. √36 = ?
+   A. 7
+   B. 5
+   C. 6
+   D. 4
+
+3. 13² = ?
+   A. 144
+   B. 178
+   C. 200
+   D. 169
+
+4. 40² = ?
+   A. 1567
+   B. 1439
+   C. 1600
+   D. 1369
+
+5. √49 = ?
+   A. 6
+   B. 5
+   C. 7
+   D. 8
+
+6. (16 + 1)² = ?
+   A. 339
+   B. 289
+   C. 326
+   D. 346
+
+7. 97 × 57 + 15 = ?
+   A. 6620
+   B. 5544
+   C. 5391
+   D. 5893
+
+8. 66² = ?
+   A. 4107
+   B. 4356
+   C. 4323
+   D. 4763
+
+9. √100 = ?
+   A. 9
+   B. 8
+   C. 11
+   D. 10
+
+10. (22 + 31)² = ?
+   A. 2942
+   B. 2654
+   C. 2648
+   D. 2809
+
+=== 参考答案 ===
+1. 4096
+2. 6
+3. 169
+4. 1600
+5. 7
+6. 289
+7. 5544
+8. 4356
+9. 10
+10. 2809

src/exam_papers/wjw/2025-10-11-13-30-14.txt

@@ -0,0 +1,75 @@
+试卷级别: 高中
+生成时间: 2025年10月11日 13时30分14秒
+题目数量: 10
+
+1. 70 + cos(0°) - 91 = ?
+   A. -18.61
+   B. -21.55
+   C. -20.00
+   D. -23.39
+
+2. cos(150°) = ?
+   A. -0.87
+   B. -0.74
+   C. -0.89
+   D. -1.01
+
+3. 53 + tan(60°) - 54 = ?
+   A. 0.63
+   B. 0.62
+   C. 0.73
+   D. 0.77
+
+4. sin(150°) = ?
+   A. 0.53
+   B. 0.42
+   C. 0.50
+   D. 0.60
+
+5. 8 + sin(45°) - 82 = ?
+   A. -61.24
+   B. -65.98
+   C. -87.77
+   D. -73.29
+
+6. 73 - cos(180°) - 24 = ?
+   A. 50.00
+   B. 41.82
+   C. 59.18
+   D. 56.02
+
+7. cos(45°) = ?
+   A. 0.71
+   B. 0.83
+   C. 0.70
+   D. 0.61
+
+8. cos(120°) = ?
+   A. -0.53
+   B. -0.50
+   C. -0.59
+   D. -0.42
+
+9. 59 - cos(120°) - 29 = ?
+   A. 30.50
+   B. 30.45
+   C. 33.74
+   D. 27.00
+
+10. cos(135°) = ?
+   A. -0.77
+   B. -0.70
+   C. -0.71
+   D. -0.61
+
+=== 参考答案 ===
+1. -20.00
+2. -0.87
+3. 0.73
+4. 0.50
+5. -73.29
+6. 50.00
+7. 0.71
+8. -0.50
+9. 30.50
+10. -0.71

src/exam_papers/wjw/2025-10-11-13-40-07.txt

@@ -0,0 +1,75 @@
+试卷级别: 小学
+生成时间: 2025年10月11日 13时40分07秒
+题目数量: 10
+
+1. 5 + 60 = ?
+   A. 63
+   B. 71
+   C. 59
+   D. 65
+
+2. 68 + 22 = ?
+   A. 87
+   B. 90
+   C. 78
+   D. 76
+
+3. 77 + 26 = ?
+   A. 103
+   B. 84
+   C. 108
+   D. 106
+
+4. 62 + 59 = ?
+   A. 142
+   B. 121
+   C. 123
+   D. 103
+
+5. 6 × 6 = ?
+   A. 32
+   B. 36
+   C. 38
+   D. 42
+
+6. 96 + 35 = ?
+   A. 127
+   B. 120
+   C. 131
+   D. 106
+
+7. 96 + 12 = ?
+   A. 89
+   B. 120
+   C. 108
+   D. 115
+
+8. 66 + 2 = ?
+   A. 55
+   B. 77
+   C. 74
+   D. 68
+
+9. 99 - 37 = ?
+   A. 68
+   B. 50
+   C. 59
+   D. 62
+
+10. 81 - 11 = ?
+   A. 57
+   B. 56
+   C. 75
+   D. 70
+
+=== 参考答案 ===
+1. 65
+2. 90
+3. 103
+4. 121
+5. 36
+6. 131
+7. 108
+8. 68
+9. 62
+10. 70

src/main.py

@@ -1,5 +0,0 @@
-from app import MathApp
-
-if __name__ == "__main__":
-    app = MathApp()
-    app.mainloop()

src/quiz_generator.py

@@ -1,96 +0,0 @@
-
-import random
-from abc import ABC, abstractmethod
-
-# 安全的表达式求值函数
-def safe_eval(expression):
-    try:
-        return eval(expression, {"__builtins__": None}, {})
-    except Exception:
-        return None
-
-class Question:
-    def __init__(self, text, options, correct_answer_index):
-        self.text = text
-        self.options = options
-        self.correct_answer_index = correct_answer_index
-
-class QuestionGenerator(ABC):
-    def generate_bunch(self, count):
-        questions = []
-        generated_texts = set()
-        while len(questions) < count:
-            text, answer = self._create_question_and_answer()
-            if text not in generated_texts:
-                options = self._generate_options(answer)
-                correct_index = options.index(answer)
-                
-                questions.append(Question(text, options, correct_index))
-                generated_texts.add(text)
-        return questions
-
-    def _generate_options(self, correct_answer):
-        options = {correct_answer}
-        while len(options) < 4:
-            offset = random.randint(-10, 10)
-            if offset == 0:
-                offset = random.choice([-1, 1]) * 10
-            
-            distractor = correct_answer + offset
-            options.add(distractor)
-        
-        option_list = list(options)
-        random.shuffle(option_list)
-        return option_list
-
-    @abstractmethod
-    def _create_question_and_answer(self):
-        pass
-
-class PrimarySchoolGenerator(QuestionGenerator):
-    def _create_question_and_answer(self):
-        ops = ['+', '-', '*', '/']
-        op = random.choice(ops)
-
-        if op == '+':
-            num1, num2 = random.randint(1, 100), random.randint(1, 100)
-            expr = f"{num1} + {num2}"
-        elif op == '-':
-            num1, num2 = random.randint(1, 100), random.randint(1, 100)
-            if num1 < num2: num1, num2 = num2, num1
-            expr = f"{num1} - {num2}"
-        elif op == '*':
-            num1, num2 = random.randint(1, 20), random.randint(1, 20)
-            expr = f"{num1} * {num2}"
-        else: # op == '/'
-            divisor = random.randint(2, 10)
-            answer = random.randint(2, 20)
-            dividend = divisor * answer
-            expr = f"{dividend} / {divisor}"
-
-        return expr, int(safe_eval(expr))
-
-class MiddleSchoolGenerator(PrimarySchoolGenerator):
-    def _create_question_and_answer(self):
-        if random.choice([True, False]):
-            return super()._create_question_and_answer()
-        else:
-            base = random.randint(2, 10)
-            expr = f"{base}**2"
-            return expr, int(safe_eval(expr))
-            
-class HighSchoolGenerator(MiddleSchoolGenerator):
-     def _create_question_and_answer(self):
-        # 简化版高中题，可扩展为三角函数等
-        return super()._create_question_and_answer()
-
-def get_generator(level):
-    generators = {
-        "小学": PrimarySchoolGenerator,
-        "初中": MiddleSchoolGenerator,
-        "高中": HighSchoolGenerator,
-    }
-    generator_class = generators.get(level)
-    if generator_class:
-        return generator_class()
-    raise ValueError("无效的等级")

src/user_manager.py

@@ -1,105 +0,0 @@
-# src/user_manager.py
-import json
-import hashlib
-import os
-import re
-import smtplib
-import ssl
-from email.message import EmailMessage
-
-def send_verification_email(recipient_email, code):
-    """
-    发送验证码邮件的函数。
-    """
-    # --- 配置区域 ---
-    SENDER_EMAIL = "876413020@qq.com"  
-    APP_PASSWORD = "wbeyuimdbvkxbdgf"  
-    SMTP_SERVER = "smtp.qq.com"
-    SMTP_PORT = 465
-
-    # --- 构建邮件内容 ---
-    msg = EmailMessage()
-    msg['Subject'] = "【数学学习软件】您的注册验证码"
-    msg['From'] = SENDER_EMAIL
-    msg['To'] = recipient_email
-    msg.set_content(
-        f"您好！\n\n"
-        f"感谢您注册数学学习软件。您的验证码是：\n\n"
-        f"【 {code} 】\n\n"
-        f"请在5分钟内使用。如果不是您本人操作，请忽略此邮件。"
-    )
-
-    # --- 发送邮件（健壮的结构）---
-    smtp_server = None
-    try:
-        context = ssl.create_default_context()
-        smtp_server = smtplib.SMTP_SSL(SMTP_SERVER, SMTP_PORT, context=context)
-        smtp_server.login(SENDER_EMAIL, APP_PASSWORD)
-        smtp_server.send_message(msg)
-        
-        print(f"邮件已成功发送至 {recipient_email}")
-        return True
-
-    except smtplib.SMTPAuthenticationError:
-        print("邮件发送失败: 认证错误。请检查邮箱或授权码是否正确。")
-        return False
-    except Exception as e:
-        print(f"邮件发送时发生错误: {e}")
-        return False
-    finally:
-        if smtp_server:
-            try:
-                smtp_server.quit()
-            except Exception:
-                pass
-
-class UserManager:
-    def __init__(self):
-        self.users = self._load_users()
-
-    def _load_users(self):
-        if os.path.exists("users.json"):
-            try:
-                with open("users.json", 'r', encoding='utf-8') as f:
-                    return json.load(f)
-            except (json.JSONDecodeError, IOError):
-                return {}
-        return {}
-
-    def _save_users(self):
-        with open("users.json", 'w', encoding='utf-8') as f:
-            json.dump(self.users, f, indent=4)
-
-    def _hash_password(self, password, salt):
-        return hashlib.sha256((password + salt).encode()).hexdigest()
-
-    def is_email_registered(self, email):
-        return email in self.users
-
-    def validate_password_format(self, password):
-        """密码必须 6-10 位，包含大小写字母和数字"""
-        if 6 <= len(password) <= 10 and \
-           re.search(r"[a-z]", password) and \
-           re.search(r"[A-Z]", password) and \
-           re.search(r"\d", password):
-            return True
-        return False
-
-    def register_user(self, email, password):
-        if self.is_email_registered(email):
-            return False, "该邮箱已被注册。"
-        
-        salt = os.urandom(16).hex()
-        password_hash = self._hash_password(password, salt)
-        self.users[email] = {"password_hash": password_hash, "salt": salt}
-        self._save_users()
-        return True, "注册成功！"
-
-    def validate_login(self, email, password):
-        if not self.is_email_registered(email):
-            return False
-        
-        user_data = self.users[email]
-        salt = user_data["salt"]
-        password_hash = self._hash_password(password, salt)
-        return password_hash == user_data["password_hash"]