Second commit

src/Base/Exam_result.java

@@ -0,0 +1,42 @@
+package Base;
+
+import java.util.Date;
+import java.util.List;
+
+public class Exam_result {
+    private String exam_type;
+    private int total_questions;
+    private int correct_answers;
+    private double score;
+    private long duration; // 考试时长（秒）
+    private List<Integer> wrong_questions; // 错题索引
+
+    public Exam_result( String examType, int total,
+                      int correct, double score, long duration,
+                      List<Integer> wrong) {
+        this.exam_type = examType;
+        this.total_questions = total;
+        this.correct_answers = correct;
+        this.score = Math.round(score * 100.0) / 100.0;
+        this.duration = duration;
+        this.wrong_questions = wrong;
+    }
+
+    public String getExamType() { return exam_type; }
+    public int getTotalQuestions() { return total_questions; }
+    public int getCorrectAnswers() { return correct_answers; }
+    public double getScore() { return score; }
+    public long getDuration() { return duration; }
+    public List<Integer> getWrongQuestions() { return wrong_questions; }
+
+    public String get_time() {
+        long minutes = duration / 60;
+        long seconds = duration % 60;
+        return String.format("%d分%d秒", minutes, seconds);
+    }
+
+    public String getCorrectRate() {
+        return String.format("%.1f%%", (double) correct_answers / total_questions * 100);
+    }
+
+}

src/Main.java

@@ -0,0 +1,25 @@
+import Base.Question;
+import Send_Email.Deal_i_code;
+import Send_Email.Send_email;
+import Service.Generate_paper;
+
+import java.util.ArrayList;
+
+public class Main {
+    public static void main(String[] args){
+        ArrayList<Question> q= Generate_paper.g_paper(12,"小学");
+        for (int i=0;i<12;i++) {
+            System.out.println(q.get(i));
+            for (int j = 0; j < 4; j++) {
+                System.out.print(q.get(i).getOptions(j) + " ");
+            }
+            System.out.println();
+            System.out.println();
+        }
+        /*String email="835981889@qq.com";
+        String code= Deal_i_code.generate_code(email);
+        if (Send_email.judge_email_address(email).equals("邮箱格式正确")){
+            Send_email.send_email(email,code);
+        }*/
+    }
+}

src/Send_Email/Deal_i_code.java

@@ -48,6 +48,8 @@ public class Deal_i_code{
     }
 
     public static void clean_all_codes(){
-        codeMap.clear();
+        if (!codeMap.isEmpty()) {
+            codeMap.clear();
+        }
     }
 }

src/Send_Email/Send_email.java

@@ -9,61 +9,51 @@ import java.util.Properties;
 import java.util.regex.Pattern;
 
 public class Send_email {
-    public static boolean judge_email_address(String email) {
+    public static String judge_email_address(String email) {
         if (email == null || email.trim().isEmpty()) {
-            System.out.println("邮箱不能为空");
-            return false;
+            return "邮箱不能为空";
         }
         // 去除前后空格
         email = email.trim();
         // 检查长度
         if (email.length() > 254) { // RFC标准规定邮箱最大长度
-            System.out.println("邮箱地址过长");
-            return false;
+            return "邮箱地址过长";
         }
         // 检查是否包含@
         if (!email.contains("@")) {
-            System.out.println("邮箱格式错误：缺少@符号");
-            return false;
+            return "邮箱格式错误：缺少@符号";
         }
         // 分割本地部分和域名部分
         String[] parts = email.split("@");
         if (parts.length != 2) {
-            System.out.println("邮箱格式错误：只能有一个@符号");
-            return false;
+            return "邮箱格式错误：只能有一个@符号";
         }
         String localPart = parts[0];
         String domainPart = parts[1];
         // 验证本地部分
         if (localPart.isEmpty()) {
-            System.out.println("邮箱格式错误：@前必须有内容");
-            return false;
+            return "邮箱格式错误：@前必须有内容";
         }
         if (localPart.length() > 64) {
-            System.out.println("邮箱格式错误：@前内容过长");
-            return false;
+            return "邮箱格式错误：@前内容过长";
         }
         // 验证域名部分
         if (domainPart.isEmpty()) {
-            System.out.println("邮箱格式错误：@后必须有内容");
-            return false;
+            return "邮箱格式错误：@后必须有内容";
         }
         if (!domainPart.contains(".")) {
-            System.out.println("邮箱格式错误：域名不完整");
-            return false;
+            return "邮箱格式错误：域名不完整";
         }
         // 验证顶级域名
         String[] domainParts = domainPart.split("\\.");
         String topLevelDomain = domainParts[domainParts.length - 1];
         if (topLevelDomain.length() < 2) {
-            System.out.println("邮箱格式错误：顶级域名太短");
-            return false;
+            return "邮箱格式错误：顶级域名太短";
         }
         String emailRegex = "^(?=.{1,64}@)[A-Za-z0-9_-]+(\\.[A-Za-z0-9_-]+)*@"
                 + "[^-][A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*(\\.[A-Za-z]{2,})$";
         boolean matches = Pattern.matches(emailRegex, email);
-        System.out.println(matches ? "" : "邮箱格式错误");
-        return matches;
+        return matches ? "邮箱格式正确" : "邮箱格式错误";
     }
 
     public static boolean send_email(String toEmail, String Code) {

src/Service/Exam_service.java

@@ -0,0 +1,90 @@
+package Service;
+
+import Base.Exam_result;
+import Base.Question;
+
+import java.util.*;
+
+public class Exam_service {
+    private String type;
+    private ArrayList<Question> paper;
+    private int now_index;
+    private Date start_time;
+    private Date end_time;
+    private Map<Integer, Integer> user_answers;
+
+    Exam_service(int num,String type){
+        this.type=type;
+        paper=Generate_paper.g_paper(num,type);
+        now_index=0;
+        this.start_time = new Date();
+        this.user_answers = new HashMap<>();
+    }
+
+    public ArrayList<Question> get_paper() { return paper; }
+    public int get_now_index() { return now_index; }
+    public Date get_start_time() { return start_time; }
+    public Date get_end_time() { return end_time; }
+
+    public Question get_now_question() {
+        if (now_index < paper.size()) {
+            return paper.get(now_index);
+        }
+        return null;
+    }
+
+    public boolean next_one(int answer_index) {
+        if (now_index < paper.size()) {
+            user_answers.put(now_index, answer_index);
+
+            if (now_index < paper.size() - 1) {
+                now_index++;
+                return true;
+            } else {
+                end_time = new Date();
+                return false;
+            }
+        }
+        return false;
+    }
+
+    public boolean pre_one() {
+        if (now_index > 0) {
+            now_index--;
+            return true;
+        }
+        return false;
+    }
+
+    public boolean change_answer(int index,int choice){
+        if (user_answers.containsKey(index)){
+            user_answers.put(index,choice);
+            return true;
+        }
+        return false;
+    }
+
+    public Integer get_user_answer(int question_index) {
+        return user_answers.get(question_index);
+    }
+
+    public Exam_result calculate_result(){
+        int correct = 0;
+        List<Integer> wrong = new ArrayList<>();
+
+        for (int i = 0; i < paper.size(); i++) {
+            Integer userAnswer = user_answers.get(i);
+            if (userAnswer != null && paper.get(i).getOptions(userAnswer).equals(paper.get(i).getAnswer())) {
+                correct++;
+            } else {
+                wrong.add(i);
+            }
+        }
+
+        double score = (double) correct / paper.size() * 100;
+        long duration = (end_time.getTime() - start_time.getTime()) / 1000; // 秒
+
+        return new Exam_result(type, paper.size(), correct,
+                score, duration, wrong);
+    }
+}

src/Service/Generate_paper.java

@@ -7,6 +7,7 @@ import Generator.Pri_g_ques;
 import Generator.Sen_g_ques;
 
 import java.util.ArrayList;
+import java.util.Objects;
 
 public class Generate_paper {
     public static ArrayList<Question> g_paper(int num,String type) {
@@ -30,10 +31,25 @@ public class Generate_paper {
             }
         }
         for (int i=0;i<num;i++){
-            Question temp=new Question(i+1,generator.g_question(),generator.g_type());
-            temp.set_options();
-            result.add(temp);
+            String temp;
+            int try_times = 0;
+            do {
+                temp = generator.g_question();
+                try_times++;
+            } while (check_repetition(result,temp) && try_times <= 50);
+            Question t=new Question(i+1,temp,generator.g_type());
+            t.set_options();
+            result.add(t);
         }
         return result;
     }
+
+    private static boolean check_repetition(ArrayList<Question> all,String ques){
+        for (Question q:all){
+            if (q.getContent().equals(ques)){
+                return true;
+            }
+        }
+        return false;
+    }
 }

src/Service/User_service.java

@@ -1,6 +1,9 @@
 package Service;
 
 import Base.User;
+import Send_Email.Deal_i_code;
+import Send_Email.Send_email;
+
 import java.io.*;
 import java.util.ArrayList;
 
@@ -14,6 +17,54 @@ public class User_service {
         }
     }
 
+    public String register(String email){
+        Deal_i_code.clean_all_codes();
+        if (find_user(email)!=null){
+            return "邮箱已被注册";
+        }
+        String judge_result=Send_email.judge_email_address(email);
+        if (judge_result.equals("邮箱格式正确")){
+            String code=Deal_i_code.generate_code(email);
+            if (!Send_email.send_email(email,code)){
+                return "邮件发送失败";
+            }
+            return "验证码已发送";
+        }
+        else{
+            return judge_result;
+        }
+    }
+
+    public String check_register(String email,String input_code,String pwd){
+        if (Deal_i_code.judge_code(email,input_code)){
+            if (!User.check_password(pwd)){
+                return "密码长6-20位，至少包含大小写字母和数字";
+            }
+            User new_one=new User(email);
+            new_one.set_password(pwd);
+            users.add(new_one);
+            Deal_i_code.clean_all_codes();
+            if (!save_users()){
+                return "注册失败，请重试";
+            }
+            return "注册成功";
+        }
+        else {
+            return "验证码不存在或不正确";
+        }
+    }
+
+    public String login(String email,String pwd){
+        User u=find_user(email);
+        if (u==null){
+            return "请先注册";
+        }
+        if (u.get_password().equals(pwd)){
+            return "登陆成功";
+        }
+        return "密码有误";
+    }
+
     public String change_pwd(String email, String oldPassword, String newPassword){
         User user=find_user(email);
         if (user == null) {
@@ -35,6 +86,18 @@ public class User_service {
         return "修改失败";
     }
 
+    public String logout(String email){
+        User user=find_user(email);
+        if (user!=null) {
+            if (users.remove(user)) {
+                if (!save_users()) {
+                    return "注销成功";
+                }
+            }
+        }
+        return "注销失败";
+    }
+
     public User find_user(String email){
         for (User user : users) {
             if (user.get_email().equals(email)) {
@@ -44,7 +107,7 @@ public class User_service {
         return null;
     }
 
-    public boolean save_users(){
+    private boolean save_users(){
         File baseDir = new File(base_dir);
         if (!baseDir.exists()) {
             if (!baseDir.mkdirs()){
@@ -65,7 +128,7 @@ public class User_service {
         }
     }
 
-    public boolean load_users(){
+    private boolean load_users(){
         users=new ArrayList<>();
         String file_path=base_dir+"用户信息.txt";
         File file=new File(file_path);