src/Main.java

@@ -0,0 +1,7 @@
+import controller.AppController;
+
+public class Main {
+    public static void main(String[] args) {
+        new AppController(); // 启动控制器
+    }
+}

src/controller/AppController.java

@@ -0,0 +1,112 @@
+package controller;
+
+import ui.LoginPanel;
+import ui.RegisterPanel;
+import ui.DifficultySelectionPanel; // 添加难度选择面板
+import view.QuizPanel; // 保持原有导入
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * 控制器：负责界面切换与核心逻辑
+ */
+public class AppController {
+    private JFrame frame;
+    private UserManager userManager;
+
+    public AppController() {
+        userManager = new UserManager();
+
+        frame = new JFrame("学生数学学习系统");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setSize(450, 400);
+        frame.setLocationRelativeTo(null);
+        frame.setLayout(new BorderLayout());
+
+        showLoginPanel();
+        frame.setVisible(true);
+    }
+
+    /** 显示登录界面 */
+    public void showLoginPanel() {
+        frame.getContentPane().removeAll();
+        frame.add(new LoginPanel(this));
+        frame.revalidate();
+        frame.repaint();
+    }
+
+    /** 显示注册界面 */
+    public void showRegisterPanel() {
+        frame.getContentPane().removeAll();
+        frame.add(new RegisterPanel(this));
+        frame.revalidate();
+        frame.repaint();
+    }
+
+    /** 显示难度选择界面 */
+    public void showDifficultySelectionPanel() {
+        frame.getContentPane().removeAll();
+        frame.add(new DifficultySelectionPanel(this));
+        frame.revalidate();
+        frame.repaint();
+    }
+
+    /** 显示题目选择界面（QuizPanel） */
+    public void showQuizPanel(String level, int count) {
+        frame.getContentPane().removeAll();
+        frame.add(new QuizPanel(this, level, count));
+        frame.revalidate();
+        frame.repaint();
+    }
+
+    /** 登录逻辑 */
+    public void handleLogin(String email, String password) {
+        if (userManager.checkLogin(email, password)) {
+            JOptionPane.showMessageDialog(frame, "登录成功！");
+            // 跳转到难度选择界面
+            showDifficultySelectionPanel();
+        } else {
+            JOptionPane.showMessageDialog(frame, "邮箱或密码错误！");
+        }
+    }
+
+    /** 注册逻辑 */
+    public void handleRegister(String email, String password) {
+        if (userManager.isUserExist(email)) {
+            JOptionPane.showMessageDialog(frame, "该邮箱已注册！");
+            return;
+        }
+        userManager.addUser(email, password);
+        JOptionPane.showMessageDialog(frame, "注册成功！请登录。");
+        showLoginPanel();
+    }
+
+    /** 在难度选择界面处理难度选择 */
+    public void handleDifficultySelection(String level) {
+        // 弹出输入框要求输入题目数量
+        String countInput = JOptionPane.showInputDialog(
+                frame,
+                "请输入需要生成的题目数量 (1-50):",
+                "题目数量",
+                JOptionPane.INFORMATION_MESSAGE
+        );
+
+        if (countInput == null) {
+            // 用户取消输入
+            return;
+        }
+
+        try {
+            int count = Integer.parseInt(countInput);
+            if (count < 1 || count > 50) {
+                JOptionPane.showMessageDialog(frame, "题目数量必须在1-50之间！");
+                return;
+            }
+            // 跳转到题目界面
+            showQuizPanel(level, count);
+        } catch (NumberFormatException e) {
+            JOptionPane.showMessageDialog(frame, "请输入有效的数字！");
+        }
+    }
+}

src/controller/UserManager.java

@@ -0,0 +1,60 @@
+package controller;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 用户信息管理（本地文件，无数据库）
+ */
+public class UserManager {
+    private static final String USER_FILE = "users.txt";
+    private Map<String, String> users = new HashMap<>();
+
+    public UserManager() {
+        loadUsers();
+    }
+
+    /** 检查登录 */
+    public boolean checkLogin(String email, String password) {
+        return users.containsKey(email) && users.get(email).equals(password);
+    }
+
+    /** 判断用户是否存在 */
+    public boolean isUserExist(String email) {
+        return users.containsKey(email);
+    }
+
+    /** 添加用户 */
+    public void addUser(String email, String password) {
+        users.put(email, password);
+        saveUsers();
+    }
+
+    /** 加载用户文件 */
+    private void loadUsers() {
+        File file = new File(USER_FILE);
+        if (!file.exists()) return;
+        try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                String[] parts = line.split(",");
+                if (parts.length == 2)
+                    users.put(parts[0], parts[1]);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /** 保存用户信息 */
+    private void saveUsers() {
+        try (PrintWriter pw = new PrintWriter(new FileWriter(USER_FILE))) {
+            for (Map.Entry<String, String> entry : users.entrySet()) {
+                pw.println(entry.getKey() + "," + entry.getValue());
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/model/Question.java

@@ -0,0 +1,14 @@
+package model;
+
+public class Question {
+    private String text;
+    private String userAnswer;
+
+    public Question(String text) {
+        this.text = text;
+    }
+
+    public String getText() { return text; }
+    public String getUserAnswer() { return userAnswer; }
+    public void setUserAnswer(String ans) { this.userAnswer = ans; }
+}

src/model/QuestionGenerator.java

@@ -0,0 +1,124 @@
+package model;
+
+import java.util.*;
+
+/**
+ * 随机题目生成器
+ * 小学：仅 + - * / ()
+ * 初中：含平方、根号
+ * 高中：含三角函数
+ */
+public class QuestionGenerator {
+    private static final Random rand = new Random();
+
+    public static List<Question> generateQuestions(String level, int count) {
+        Set<String> uniqueQuestions = new HashSet<>();
+        List<Question> list = new ArrayList<>();
+
+        while (list.size() < count) {
+            String q;
+            switch (level) {
+                case "小学":
+                    q = genPrimary();
+                    break;
+                case "初中":
+                    q = genMiddle();
+                    break;
+                default:
+                    q = genHigh();
+            }
+            if (!uniqueQuestions.contains(q)) {
+                uniqueQuestions.add(q);
+                list.add(new Question(q, getOptions(q)));
+            }
+        }
+        return list;
+    }
+
+    // 小学难度
+    private static String genPrimary() {
+        int a = rand.nextInt(50) + 1;
+        int b = rand.nextInt(50) + 1;
+        char op = "+-*/".charAt(rand.nextInt(4));
+        return a + " " + op + " " + b;
+    }
+
+    // 初中难度
+    private static String genMiddle() {
+        int a = rand.nextInt(20) + 1;
+        int b = rand.nextInt(5) + 1;
+        String[] ops = {a + "^2", "√" + (a * b), "(" + a + "+" + b + ")^2"};
+        return ops[rand.nextInt(ops.length)];
+    }
+
+    // 高中难度
+    private static String genHigh() {
+        String[] funcs = {"sin", "cos", "tan"};
+        int angle = (rand.nextInt(12) + 1) * 15;
+        return funcs[rand.nextInt(3)] + "(" + angle + "°)";
+    }
+
+    // 模拟生成四个选项（正确答案随机放置）
+    private static String[] getOptions(String question) {
+        double correct = calculate(question);
+        String[] opts = new String[4];
+        int correctPos = rand.nextInt(4);
+        for (int i = 0; i < 4; i++) {
+            opts[i] = (i == correctPos)
+                    ? String.format("%.2f", correct)
+                    : String.format("%.2f", correct + rand.nextDouble() * 5 - 2.5);
+        }
+        return opts;
+    }
+
+    private static double calculate(String q) {
+        try {
+            if (q.contains("sin")) {
+                int angle = Integer.parseInt(q.replaceAll("\\D", ""));
+                return Math.sin(Math.toRadians(angle));
+            }
+            if (q.contains("cos")) {
+                int angle = Integer.parseInt(q.replaceAll("\\D", ""));
+                return Math.cos(Math.toRadians(angle));
+            }
+            if (q.contains("tan")) {
+                int angle = Integer.parseInt(q.replaceAll("\\D", ""));
+                return Math.tan(Math.toRadians(angle));
+            }
+            if (q.contains("√")) {
+                int num = Integer.parseInt(q.replaceAll("\\D", ""));
+                return Math.sqrt(num);
+            }
+            if (q.contains("^2")) {
+                int num = Integer.parseInt(q.replaceAll("\\D", ""));
+                return num * num;
+            }
+            // 简单算术
+            String[] tokens = q.split(" ");
+            double a = Double.parseDouble(tokens[0]);
+            double b = Double.parseDouble(tokens[2]);
+            return switch (tokens[1]) {
+                case "+" -> a + b;
+                case "-" -> a - b;
+                case "*" -> a * b;
+                case "/" -> b != 0 ? a / b : 0;
+                default -> 0;
+            };
+        } catch (Exception e) {
+            return 0;
+        }
+    }
+
+    // Question 内部类
+    public static class Question {
+        public String questionText;
+        public String[] options;
+        public String correctAnswer;
+
+        public Question(String text, String[] options) {
+            this.questionText = text;
+            this.options = options;
+            this.correctAnswer = options[0]; // 默认第一个是正确答案（计算时设置）
+        }
+    }
+}

src/model/User.java

@@ -0,0 +1,13 @@
+package model;
+
+public class User {
+    private String email;
+    private String password;
+
+    public User(String email, String password) {
+        this.email = email;
+        this.password = password;
+    }
+    public String getEmail() { return email; }
+    public String getPassword() { return password; }
+}

src/ui/DifficultySelectionPanel.java

@@ -0,0 +1,39 @@
+package ui;
+
+import controller.AppController;
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class DifficultySelectionPanel extends JPanel {
+    private AppController controller;
+
+    public DifficultySelectionPanel(AppController controller) {
+        this.controller = controller;
+        setLayout(new GridLayout(3, 1, 10, 10));
+        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
+
+        // 创建难度按钮
+        JButton elementaryBtn = createDifficultyButton("小学", "小学");
+        JButton middleBtn = createDifficultyButton("初中", "初中");
+        JButton highBtn = createDifficultyButton("高中", "高中");
+
+        add(elementaryBtn);
+        add(middleBtn);
+        add(highBtn);
+    }
+
+    private JButton createDifficultyButton(String text, String level) {
+        JButton btn = new JButton(text);
+        btn.setFont(new Font("微软雅黑", Font.BOLD, 16));
+        btn.setPreferredSize(new Dimension(200, 40));
+        btn.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                controller.handleDifficultySelection(level);
+            }
+        });
+        return btn;
+    }
+}

src/ui/LoginPanel.java

@@ -0,0 +1,57 @@
+package ui;
+
+import controller.AppController;
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * 登录界面
+ */
+public class LoginPanel extends JPanel {
+    private JTextField emailField;
+    private JPasswordField passwordField;
+
+    public LoginPanel(AppController controller) {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(8, 8, 8, 8);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        JLabel title = new JLabel("学生数学学习系统", JLabel.CENTER);
+        title.setFont(new Font("微软雅黑", Font.BOLD, 22));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(title, gbc);
+
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 1;
+        add(new JLabel("邮箱："), gbc);
+
+        gbc.gridx = 1;
+        emailField = new JTextField(20);
+        add(emailField, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 2;
+        add(new JLabel("密码："), gbc);
+
+        gbc.gridx = 1;
+        passwordField = new JPasswordField(20);
+        add(passwordField, gbc);
+
+        JButton loginButton = new JButton("登录");
+        gbc.gridx = 0; gbc.gridy = 3;
+        add(loginButton, gbc);
+
+        JButton registerButton = new JButton("注册");
+        gbc.gridx = 1;
+        add(registerButton, gbc);
+
+        loginButton.addActionListener(e -> {
+            String email = emailField.getText().trim();
+            String password = new String(passwordField.getPassword());
+            controller.handleLogin(email, password);
+        });
+
+        registerButton.addActionListener(e -> controller.showRegisterPanel());
+    }
+}

src/ui/RegisterPanel.java

@@ -0,0 +1,110 @@
+package ui;
+
+import controller.AppController;
+import util.EmailUtil;
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * 注册界面
+ */
+public class RegisterPanel extends JPanel {
+    private JTextField emailField;
+    private JTextField codeField;
+    private JPasswordField passwordField;
+    private JPasswordField confirmField;
+
+    private String sentCode = null;
+
+    public RegisterPanel(AppController controller) {
+        setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(8, 8, 8, 8);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        JLabel title = new JLabel("用户注册", JLabel.CENTER);
+        title.setFont(new Font("微软雅黑", Font.BOLD, 22));
+        gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2;
+        add(title, gbc);
+
+        gbc.gridwidth = 1;
+        gbc.gridx = 0; gbc.gridy = 1;
+        add(new JLabel("邮箱："), gbc);
+
+        gbc.gridx = 1;
+        emailField = new JTextField(20);
+        add(emailField, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 2;
+        add(new JLabel("验证码："), gbc);
+
+        gbc.gridx = 1;
+        codeField = new JTextField(10);
+        add(codeField, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 3;
+        add(new JLabel("密码："), gbc);
+
+        gbc.gridx = 1;
+        passwordField = new JPasswordField(20);
+        add(passwordField, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 4;
+        add(new JLabel("确认密码："), gbc);
+
+        gbc.gridx = 1;
+        confirmField = new JPasswordField(20);
+        add(confirmField, gbc);
+
+        JButton sendCodeButton = new JButton("发送验证码");
+        gbc.gridx = 0; gbc.gridy = 5;
+        add(sendCodeButton, gbc);
+
+        JButton registerButton = new JButton("注册");
+        gbc.gridx = 1;
+        add(registerButton, gbc);
+
+        JButton backButton = new JButton("返回登录");
+        gbc.gridx = 0; gbc.gridy = 6; gbc.gridwidth = 2;
+        add(backButton, gbc);
+
+        sendCodeButton.addActionListener(e -> {
+            String email = emailField.getText().trim();
+            if (!email.matches("^[A-Za-z0-9+_.-]+@(.+)$")) {
+                JOptionPane.showMessageDialog(this, "邮箱格式不正确！");
+                return;
+            }
+            sentCode = EmailUtil.sendVerificationCode(email);
+            JOptionPane.showMessageDialog(this, "验证码已发送（调试模式控制台查看）！");
+        });
+
+        registerButton.addActionListener(e -> {
+            String email = emailField.getText().trim();
+            String code = codeField.getText().trim();
+            String password = new String(passwordField.getPassword());
+            String confirm = new String(confirmField.getPassword());
+
+            if (sentCode == null) {
+                JOptionPane.showMessageDialog(this, "请先获取验证码！");
+                return;
+            }
+            if (!code.equals(sentCode)) {
+                JOptionPane.showMessageDialog(this, "验证码错误！");
+                return;
+            }
+            if (!password.equals(confirm)) {
+                JOptionPane.showMessageDialog(this, "两次密码不一致！");
+                return;
+            }
+            if (!password.matches("(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[A-Za-z\\d]{6,10}")) {
+                JOptionPane.showMessageDialog(this, "密码需包含大小写字母与数字，长度6-10位！");
+                return;
+            }
+
+            controller.handleRegister(email, password);
+        });
+
+        backButton.addActionListener(e -> controller.showLoginPanel());
+    }
+}

src/util/EmailUtil.java

@@ -0,0 +1,50 @@
+package util;
+
+import jakarta.mail.*;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+import java.util.Properties;
+import java.util.Random;
+
+/**
+ * 邮件发送工具（支持 QQ、163 邮箱）
+ * 使用时请修改 senderEmail / senderAuthCode
+ */
+public class EmailUtil {
+
+    // 修改为你的发件邮箱和授权码（⚠️不是密码）
+    private static final String senderEmail = "1193626695@qq.com";
+    private static final String senderAuthCode = "ldxzjbnsirnsbacj";
+    private static final String smtpHost = "smtp.qq.com"; // 163 改为 smtp.163.com
+
+    public static String sendVerificationCode(String toEmail) {
+        String code = String.valueOf(100000 + new Random().nextInt(900000));
+
+        Properties props = new Properties();
+        props.put("mail.smtp.auth", "true");
+        props.put("mail.smtp.host", smtpHost);
+        props.put("mail.smtp.port", "587");
+        props.put("mail.smtp.starttls.enable", "true");
+
+        Session session = Session.getInstance(props, new Authenticator() {
+            protected PasswordAuthentication getPasswordAuthentication() {
+                return new PasswordAuthentication(senderEmail, senderAuthCode);
+            }
+        });
+
+        try {
+            Message message = new MimeMessage(session);
+            message.setFrom(new InternetAddress(senderEmail));
+            message.setRecipient(Message.RecipientType.TO, new InternetAddress(toEmail));
+            message.setSubject("【数学学习系统】注册验证码");
+            message.setText("您的验证码是：" + code + "\n（有效期5分钟）");
+
+            Transport.send(message);
+            System.out.println("✅ 邮件验证码已发送到：" + toEmail);
+        } catch (Exception e) {
+            System.err.println("⚠️ 邮件发送失败：" + e.getMessage());
+        }
+
+        return code;
+    }
+}

src/util/FileUtil.java

@@ -0,0 +1,31 @@
+package util;
+
+import model.User;
+import java.io.*;
+import java.util.*;
+
+public class FileUtil {
+    public static Map<String, User> loadUsers(String fileName) {
+        Map<String, User> users = new HashMap<>();
+        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                String[] parts = line.split(",");
+                users.put(parts[0], new User(parts[0], parts[1]));
+            }
+        } catch (IOException e) {
+            // 首次运行时文件可能不存在
+        }
+        return users;
+    }
+
+    public static void saveUsers(Map<String, User> users, String fileName) {
+        try (PrintWriter pw = new PrintWriter(new FileWriter(fileName))) {
+            for (User u : users.values()) {
+                pw.println(u.getEmail() + "," + u.getPassword());
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/view/QuizPanel.java

@@ -0,0 +1,88 @@
+package view;
+
+import controller.AppController;
+import model.QuestionGenerator;
+import model.QuestionGenerator.Question;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.List;
+
+public class QuizPanel extends JPanel {
+    private List<Question> questions;
+    private int currentIndex = 0;
+    private int correctCount = 0;
+    private ButtonGroup group;
+    private JLabel questionLabel;
+    private JRadioButton[] options;
+    private JButton nextButton;
+    private AppController controller;
+
+    public QuizPanel(AppController controller, String level, int count) {
+        this.controller = controller;
+        this.questions = QuestionGenerator.generateQuestions(level, count);
+        setLayout(new BorderLayout());
+
+        questionLabel = new JLabel("", JLabel.CENTER);
+        questionLabel.setFont(new Font("微软雅黑", Font.BOLD, 18));
+        add(questionLabel, BorderLayout.NORTH);
+
+        JPanel optionsPanel = new JPanel(new GridLayout(4, 1, 5, 5));
+        group = new ButtonGroup();
+        options = new JRadioButton[4];
+        for (int i = 0; i < 4; i++) {
+            options[i] = new JRadioButton();
+            group.add(options[i]);
+            optionsPanel.add(options[i]);
+        }
+        add(optionsPanel, BorderLayout.CENTER);
+
+        nextButton = new JButton("下一题");
+        add(nextButton, BorderLayout.SOUTH);
+
+        nextButton.addActionListener(e -> checkAndNext());
+        showQuestion();
+    }
+
+    private void showQuestion() {
+        if (currentIndex >= questions.size()) {
+            showResult();
+            return;
+        }
+        Question q = questions.get(currentIndex);
+        questionLabel.setText("第 " + (currentIndex + 1) + " 题：" + q.questionText);
+        for (int i = 0; i < 4; i++) {
+            options[i].setText(q.options[i]);
+            options[i].setSelected(false);
+        }
+    }
+
+    private void checkAndNext() {
+        for (JRadioButton r : options) {
+            if (r.isSelected() && r.getText().equals(questions.get(currentIndex).options[0])) {
+                correctCount++;
+            }
+        }
+        currentIndex++;
+        showQuestion();
+    }
+
+    private void showResult() {
+        removeAll();
+        setLayout(new GridLayout(3, 1, 10, 10));
+        JLabel result = new JLabel("你的得分：" + (100 * correctCount / questions.size()) + " 分", JLabel.CENTER);
+        result.setFont(new Font("微软雅黑", Font.BOLD, 22));
+        add(result);
+
+        JButton retry = new JButton("再做一份");
+        JButton exit = new JButton("退出");
+        add(retry);
+        add(exit);
+
+        retry.addActionListener(e -> controller.showLoginPanel());
+        exit.addActionListener(e -> System.exit(0));
+
+        revalidate();
+        repaint();
+    }
+}

src/view/ResultPanel.java

@@ -0,0 +1,19 @@
+package view;
+
+import controller.AppController;
+import model.User;
+import javax.swing.*;
+import java.awt.*;
+
+public class ResultPanel extends JPanel {
+    public ResultPanel(AppController controller, User user, int score) {
+        setLayout(new BorderLayout());
+        JLabel lbl = new JLabel("用户：" + user.getEmail() + "，得分：" + score + " 分", JLabel.CENTER);
+        lbl.setFont(new Font("微软雅黑", Font.BOLD, 20));
+        add(lbl, BorderLayout.CENTER);
+
+        JButton btnBack = new JButton("返回登录");
+        btnBack.addActionListener(e -> controller.showLoginPanel());
+        add(btnBack, BorderLayout.SOUTH);
+    }
+}