sqf commit

.idea/.gitignore

@@ -0,0 +1,8 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/copilot.data.migration.agent.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AgentMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.ask.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AskMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.ask2agent.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Ask2AgentMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.edit.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="EditMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/libraries/lib.xml

@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="lib">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/lib/javax.ejb.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.servlet.jsp.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.transaction.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/jakarta.mail-2.0.1.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.resource.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.servlet.jsp.jstl.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.jms.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.persistence.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.annotation.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/javax.servlet.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/jakarta.activation-2.0.1.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="openjdk-23" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/mathStudyAPP.iml" filepath="$PROJECT_DIR$/mathStudyAPP.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

data/sqf/2025-10-02-11-29-36.txt

@@ -1,20 +0,0 @@
-1. 37 + 35
-
-2. 82 * 28
-
-3. (16 / 56) + 42
-
-4. 6 * 52 + 35
-
-5. (99 + 26) + 37
-
-6. 40 * 63
-
-7. 52 - 61 - 16 - 70 * 51
-
-8. 65 + 83
-
-9. 84 / 64
-
-10. 24 - 47 + 21 + 1 - 33
-

data/users.cfg

@@ -1,10 +1,12 @@
 王五3	123	HIGH	wangwu3@example.com
 王五2	123	HIGH	wangwu2@example.com
+123	Aa123456	PRIMARY	2571400460@qq.com
 王五1	123	HIGH	wangwu1@example.com
+scb	Aa123456	PRIMARY	3110858122@qq.com
 张三3	123	PRIMARY	zhangsan3@example.com
 张三1	123	PRIMARY	zhangsan1@example.com
 张三2	123	PRIMARY	zhangsan2@example.com
 李四3	123	MIDDLE	lishi3@example.com
-sqf	Aa123456	PRIMARY	sqf090815@hnu.edu.cn
+sqf	Qq123456	PRIMARY	sqf090815@hnu.edu.cn
 李四1	123	MIDDLE	lishi1@example.com
 李四2	123	MIDDLE	lishi2@example.com

mathStudyApp.iml

@@ -8,7 +8,5 @@
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="lib" level="project" />
-    <orderEntry type="library" name="jakarta.activation-2.0.1 (2)" level="project" />
-    <orderEntry type="library" name="jakarta.mail-2.0.1 (2)" level="project" />
   </component>
 </module>

src/Main.java

@@ -1,4 +1,5 @@
 import javax.swing.SwingUtilities;
+
 import view.LoginFrame;
 
 /**

src/controller/AssignController.java

@@ -1,18 +0,0 @@
-package controller;
-
-import model.Login;
-import model.LanguageSwitch;
-import view.ExamSetupFrame;
-
-import javax.swing.JOptionPane;
-
-/**
- * 登录后流程控制：负责从登录跳转到出题设置
- */
-public class AssignController {
-  public void loginSuccess(Login.Account user) {
-    JOptionPane.showMessageDialog(null,
-        "登录成功。当前选择为 " + LanguageSwitch.levelToChinese(user.level) + " 出题");
-    new ExamSetupFrame(user);
-  }
-}

src/controller/FunctionController.java

@@ -1,16 +1,17 @@
 package controller;
 
+import javax.swing.JOptionPane;
+
 import model.Create;
 import model.Login;
 import model.Paper;
 import view.ExamFrame;
 
-import javax.swing.JOptionPane;
-
 /**
  * 题目生成控制器：接收题数与用户信息，调用 Create 生成 Paper 并打开 ExamFrame
  */
 public class FunctionController {
+
   private Login.Account user;
 
   public FunctionController(Login.Account user) {

src/model/Create.java

@@ -1,44 +1,23 @@
 package model;
 
-import java.util.*;
-import javax.script.*;
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Random;
+import java.util.Set;
+
+import javax.script.ScriptException;
 
 /**
  * 负责生成试卷并创建选择题选项（四选一）
  */
 public class Create {
 
-  // 把数学表达式转换为 JS 可执行表达式的简单转换器
-  private static String toJsExpr(String expr) {
-    String s = expr;
-    s = s.replaceAll("\\^2", ".pow2"); // 临时占位
-    s = s.replaceAll("sqrt\\(", "Math.sqrt(");
-    s = s.replaceAll("sin\\(", "Math.sin(Math.toRadians(");
-    s = s.replaceAll("cos\\(", "Math.cos(Math.toRadians(");
-    s = s.replaceAll("tan\\(", "Math.tan(Math.toRadians(");
-    // 修复 sin(Math.toRadians(x) 末尾多一层 ) -> we need to close paren
-    // Simple approach: for each "Math.sin(Math.toRadians(", there will be following number or parenthesis, we close later with "))"
-    // Replace our .pow2 placeholder into Math.pow(x,2)
-    // Handle pow2: we earlier converted x^2 -> x.pow2, so replace (\d+|...) .pow2 to Math.pow(that,2)
-    // For simplicity, replace pattern "([0-9)]+)\\.pow2" with "Math.pow($1,2)" — approximate
-    s = s.replaceAll("(\\d+)\\.pow2", "Math.pow($1,2)");
-    // If there are parentheses before .pow2: ") .pow2" unlikely; accept some limitations.
-    // For sin/cos/tan we changed 'sin(' -> 'Math.sin(Math.toRadians(' so must add two closing ) after the argument.
-    // To keep it simple, replace "Math.sin(Math.toRadians(" -> "Math.sin(Math.toRadians(" and later we will ensure parentheses in evaluation by appending "))" when needed.
-    // We'll also replace any leftover "^2" directly
-    s = s.replaceAll("\\^2", "");
-    // Finally, replace any multiple spaces
-    s = s.replaceAll("\\s+", "");
-    return s;
-  }
-
-  // 评估表达式数值（double），若失败抛异常
   // 评估表达式数值（double），若失败抛异常
   private static double evalExpression(String expr) throws ScriptException {
     return ExpressionEvaluator.evaluate(expr);
   }
 
-
   /**
    * 生成试卷：返回 Paper 对象（questions, options, correctIndex）
    */
@@ -78,7 +57,6 @@ public class Create {
       // 判断是否为整数答案
       boolean isIntAnswer = Math.abs(correctVal - Math.round(correctVal)) < 1e-6;
 
-
 // 产生三个干扰值
       Set<String> optsSet = new LinkedHashSet<>();
       optsSet.add(correctStr);
@@ -90,7 +68,9 @@ public class Create {
         if (isIntAnswer) {
           // 整数题：干扰项也是整数（偏差 ±1~±10）
           delta = r.nextInt(10) + 1;
-          if (r.nextBoolean()) delta = -delta;
+          if (r.nextBoolean()) {
+            delta = -delta;
+          }
         } else {
           // 小数题：随机偏差比例
           delta = (Math.abs(correctVal) < 1e-6)
@@ -122,7 +102,9 @@ public class Create {
     try {
       // 为保存，我们保存原题干列表（文本）
       java.util.List<String> raw = new ArrayList<>();
-      for (String s : paper) raw.add(s);
+      for (String s : paper) {
+        raw.add(s);
+      }
       Save.savePaper(user.username, raw);
     } catch (RuntimeException re) {
       // 抛给 UI 处理（但仍返回 Paper）
@@ -143,13 +125,17 @@ public class Create {
   }
 
   private static int findIndex(String[] arr, String target) {
-    for (int i = 0; i < arr.length; i++) if (arr[i].equals(target)) return i;
+    for (int i = 0; i < arr.length; i++) {
+      if (arr[i].equals(target)) {
+        return i;
+      }
+    }
     return 0;
   }
 
   private static String formatNumber(double v) {
     if (Math.abs(v - Math.round(v)) < 1e-6) {
-      return String.valueOf((long)Math.round(v));
+      return String.valueOf((long) Math.round(v));
     } else {
       return String.format("%.3f", v);
     }

src/model/ExpressionEvaluator.java

@@ -1,9 +1,17 @@
 package model;
-import java.util.*;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Stack;
+import java.util.StringTokenizer;
+
 
 public class ExpressionEvaluator {
 
   private static final Map<String, Integer> PRECEDENCE = new HashMap<>();
+
   static {
     PRECEDENCE.put("+", 1);
     PRECEDENCE.put("-", 1);
@@ -26,12 +34,12 @@ public class ExpressionEvaluator {
   private static List<String> toRPN(String expr) {
     List<String> output = new ArrayList<>();
     Stack<String> stack = new Stack<>();
-
-    // 正则拆分 token（数字、函数、符号、括号）
     StringTokenizer tokenizer = new StringTokenizer(expr, "+-*/^() ", true);
     while (tokenizer.hasMoreTokens()) {
       String token = tokenizer.nextToken().trim();
-      if (token.isEmpty()) continue;
+      if (token.isEmpty()) {
+        continue;
+      }
 
       if (token.matches("[0-9.]+")) { // 数字
         output.add(token);
@@ -52,7 +60,6 @@ public class ExpressionEvaluator {
         if (!stack.isEmpty() && stack.peek().equals("(")) {
           stack.pop();
         }
-        // 如果栈顶是函数，弹出函数
         if (!stack.isEmpty() && stack.peek().matches("[a-zA-Z]+")) {
           output.add(stack.pop());
         }
@@ -76,20 +83,39 @@ public class ExpressionEvaluator {
         double b = stack.pop();
         double a = stack.pop();
         switch (token) {
-          case "+": stack.push(a + b); break;
-          case "-": stack.push(a - b); break;
-          case "*": stack.push(a * b); break;
-          case "/": stack.push(a / b); break;
-          case "^": stack.push(Math.pow(a, b)); break;
+          case "+":
+            stack.push(a + b);
+            break;
+          case "-":
+            stack.push(a - b);
+            break;
+          case "*":
+            stack.push(a * b);
+            break;
+          case "/":
+            stack.push(a / b);
+            break;
+          case "^":
+            stack.push(Math.pow(a, b));
+            break;
         }
       } else { // 函数
         double a = stack.pop();
         switch (token.toLowerCase()) {
-          case "sin": stack.push(Math.sin(Math.toRadians(a))); break;
-          case "cos": stack.push(Math.cos(Math.toRadians(a))); break;
-          case "tan": stack.push(Math.tan(Math.toRadians(a))); break;
-          case "sqrt": stack.push(Math.sqrt(a)); break;
-          default: throw new RuntimeException("未知函数: " + token);
+          case "sin":
+            stack.push(Math.sin(Math.toRadians(a)));
+            break;
+          case "cos":
+            stack.push(Math.cos(Math.toRadians(a)));
+            break;
+          case "tan":
+            stack.push(Math.tan(Math.toRadians(a)));
+            break;
+          case "sqrt":
+            stack.push(Math.sqrt(a));
+            break;
+          default:
+            throw new RuntimeException("未知函数: " + token);
         }
       }
     }

src/model/Generator.java

@@ -1,6 +1,11 @@
 package model;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Random;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
@@ -31,7 +36,8 @@ public class Generator extends QuestionGenerator {
       }
     }
     if (generated.size() < n) {
-      System.out.println("注意：无法生成足够的不重复题目，已生成 " + generated.size() + " 道题（请求 " + n + " 道）");
+      System.out.println(
+          "注意：无法生成足够的不重复题目，已生成 " + generated.size() + " 道题（请求 " + n + " 道）");
     }
     return new ArrayList<>(generated);
   }
@@ -59,7 +65,8 @@ public class Generator extends QuestionGenerator {
     boolean useParens = RAND.nextBoolean();
     if (useParens && operands >= 3 && RAND.nextBoolean()) {
       sb.append("(");
-      sb.append(randInt(1, 100)).append(" ").append(randomChoice(ops)).append(" ").append(randInt(1, 100));
+      sb.append(randInt(1, 100)).append(" ").append(randomChoice(ops)).append(" ")
+          .append(randInt(1, 100));
       sb.append(")");
       for (int i = 2; i < operands; i++) {
         sb.append(" ").append(randomChoice(ops)).append(" ").append(randInt(1, 100));
@@ -75,8 +82,11 @@ public class Generator extends QuestionGenerator {
 
   public String genMiddle(int operands) {
     String expr = genPrimary(operands);
-    if (RAND.nextBoolean()) expr = applySquare(expr);
-    else expr = applySqrt(expr);
+    if (RAND.nextBoolean()) {
+      expr = applySquare(expr);
+    } else {
+      expr = applySqrt(expr);
+    }
     return expr;
   }
 
@@ -88,7 +98,9 @@ public class Generator extends QuestionGenerator {
 
   public String applySquare(String expr) {
     List<int[]> spans = findNumberSpans(expr);
-    if (spans.isEmpty()) return expr + "^2";
+    if (spans.isEmpty()) {
+      return expr + "^2";
+    }
     int[] s = spans.get(RAND.nextInt(spans.size()));
     String before = expr.substring(0, s[0]);
     String num = expr.substring(s[0], s[1]);
@@ -98,7 +110,9 @@ public class Generator extends QuestionGenerator {
 
   public String applySqrt(String expr) {
     List<int[]> spans = findNumberSpans(expr);
-    if (spans.isEmpty()) return "sqrt(" + expr + ")";
+    if (spans.isEmpty()) {
+      return "sqrt(" + expr + ")";
+    }
     int[] s = spans.get(RAND.nextInt(spans.size()));
     String before = expr.substring(0, s[0]);
     String num = expr.substring(s[0], s[1]);
@@ -109,7 +123,9 @@ public class Generator extends QuestionGenerator {
   public String applyTrig(String expr) {
     List<int[]> spans = findNumberSpans(expr);
     String func = randomChoice(Arrays.asList("sin", "cos", "tan"));
-    if (spans.isEmpty()) return func + "(" + expr + ")";
+    if (spans.isEmpty()) {
+      return func + "(" + expr + ")";
+    }
     int[] s = spans.get(RAND.nextInt(spans.size()));
     String before = expr.substring(0, s[0]);
     String num = expr.substring(s[0], s[1]);
@@ -124,10 +140,14 @@ public class Generator extends QuestionGenerator {
     while (i < n) {
       if (Character.isDigit(chs[i])) {
         int j = i;
-        while (j < n && (Character.isDigit(chs[j]))) j++;
+        while (j < n && (Character.isDigit(chs[j]))) {
+          j++;
+        }
         spans.add(new int[]{i, j});
         i = j;
-      } else i++;
+      } else {
+        i++;
+      }
     }
     return spans;
   }

src/model/LanguageSwitch.java

@@ -1,6 +1,7 @@
 package model;
 
 public class LanguageSwitch {
+
   public static String levelToChinese(Login.Level l) {
     return switch (l) {
       case PRIMARY -> "小学";

src/model/LoadFile.java

@@ -1,12 +1,16 @@
 package model;
 
-import java.nio.charset.StandardCharsets;
-import java.util.*;
-import java.nio.file.*;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.stream.Collectors;
 
+
 /**
  * 读取用户文件夹下已有题目的所有题目文本（用于查重）
  */
@@ -24,7 +28,9 @@ public class LoadFile {
         StringBuilder cur = new StringBuilder();
         for (String line : lines) {
           if (line.matches("^\\s*\\d+\\..*")) {
-            if (!cur.isEmpty()) all.add(cur.toString().trim());
+            if (!cur.isEmpty()) {
+              all.add(cur.toString().trim());
+            }
             cur.setLength(0);
             cur.append(line.replaceFirst("^\\s*\\d+\\.", "").trim());
           } else {
@@ -34,16 +40,21 @@ public class LoadFile {
                 cur.setLength(0);
               }
             } else {
-              if (!cur.isEmpty()) cur.append(" ");
+              if (!cur.isEmpty()) {
+                cur.append(" ");
+              }
               cur.append(line.trim());
             }
           }
         }
-        if (!cur.isEmpty()) all.add(cur.toString().trim());
+        if (!cur.isEmpty()) {
+          all.add(cur.toString().trim());
+        }
       }
     } catch (IOException e) {
       throw new RuntimeException("读取题目文件失败：" + e.getMessage(), e);
     }
-    return all.stream().map(String::trim).filter(s -> !s.isEmpty()).distinct().collect(Collectors.toList());
+    return all.stream().map(String::trim).filter(s -> !s.isEmpty()).distinct()
+        .collect(Collectors.toList());
   }
 }

src/model/Login.java

@@ -1,10 +1,14 @@
 package model;
 
-import java.util.Map;
-import java.util.HashMap;
-import java.io.*;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.Serializable;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
 
 
 /**
@@ -61,17 +65,30 @@ public class Login {
   }
 
   // 注册（GUI 调用），若用户名已存在返回 false
+  // 注册（GUI 调用），若用户名或邮箱已存在返回 false
   public static synchronized boolean register(String username, String password, Level level,
       String email) {
+    // 检查用户名是否重复
     if (accounts.containsKey(username)) {
       return false;
     }
+
+    // 检查邮箱是否重复
+    for (Account existing : accounts.values()) {
+      if (existing.email != null && existing.email.equalsIgnoreCase(email)) {
+        // 邮箱重复，不区分大小写
+        return false;
+      }
+    }
+
+    // 都不重复，则注册成功
     Account acc = new Account(username, password, level, email);
     accounts.put(username, acc);
     persistToFile();
     return true;
   }
 
+
   // 修改密码（需提供原密码），返回是否成功
   public static synchronized boolean changePassword(String username, String oldPwd, String newPwd) {
     Account acc = accounts.get(username);

src/model/Paper.java

@@ -6,6 +6,7 @@ import java.util.List;
  * 试卷封装：每一道题为字符串（题干），每题有四个选项（字符串），且标记正确选项索引
  */
 public class Paper {
+
   public final List<String> questions;
   public final List<String[]> options; // 每题 options[i] 长度为4
   public final int[] correctIndex; // 每题正确选项下标 0..3

src/model/Save.java

@@ -2,17 +2,22 @@ package model;
 
 import java.io.BufferedWriter;
 import java.io.IOException;
-import java.nio.file.*;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.List;
-import java.nio.charset.StandardCharsets;
 
 public class Save {
+
   public static String savePaper(String username, List<String> paper) {
     Path userDir = Paths.get("data", username);
     try {
-      if (!Files.exists(userDir)) Files.createDirectories(userDir);
+      if (!Files.exists(userDir)) {
+        Files.createDirectories(userDir);
+      }
     } catch (IOException e) {
       throw new RuntimeException("无法创建用户文件夹：" + e.getMessage(), e);
     }

src/view/ExamFrame.java

@@ -1,7 +1,20 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JRadioButton;
+import javax.swing.ButtonGroup;
+import javax.swing.BorderFactory;
+import javax.swing.SwingConstants;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.Font;
+import java.awt.GridLayout;
+
 import model.Paper;
 import model.Login;
 
@@ -9,6 +22,7 @@ import model.Login;
  * 答题界面（选择题，四选一）
  */
 public class ExamFrame extends JFrame {
+
   private Paper paper;
   private Login.Account user;
   private int index = 0;
@@ -35,12 +49,12 @@ public class ExamFrame extends JFrame {
     qLabel = new JLabel("", SwingConstants.LEFT);
     qLabel.setFont(new Font("Serif", Font.PLAIN, 16));
     JPanel top = new JPanel(new BorderLayout());
-    top.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
+    top.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
     top.add(qLabel, BorderLayout.CENTER);
 
-    centerPanel = new JPanel(new GridLayout(4,1,6,6));
+    centerPanel = new JPanel(new GridLayout(4, 1, 6, 6));
     group = new ButtonGroup();
-    for (int i=0;i<4;i++){
+    for (int i = 0; i < 4; i++) {
       radioBtns[i] = new JRadioButton();
       group.add(radioBtns[i]);
       centerPanel.add(radioBtns[i]);
@@ -63,33 +77,43 @@ public class ExamFrame extends JFrame {
     setVisible(true);
   }
 
-  /** 显示一道题 */
+  /**
+   * 显示一道题
+   */
   private void showQuestion() {
     if (index >= paper.size()) {
       showSubmitPage();
       return;
     }
     String q = paper.questions.get(index);
-    qLabel.setText("<html><b>第 " + (index+1) + " 题：</b> " + q + "</html>");
+    qLabel.setText("<html><b>第 " + (index + 1) + " 题：</b> " + q + "</html>");
     String[] opts = paper.options.get(index);
 
-    for (int i=0;i<4;i++) {
+    for (int i = 0; i < 4; i++) {
       radioBtns[i].setText(opts[i]);
     }
     // 清除上一次选择
     group.clearSelection();
   }
 
-  /** 提交当前题 */
+  /**
+   * 提交当前题
+   */
   private void submitAnswer() {
     int selected = -1;
-    for (int i=0;i<4;i++) if (radioBtns[i].isSelected()) selected = i;
+    for (int i = 0; i < 4; i++) {
+      if (radioBtns[i].isSelected()) {
+        selected = i;
+      }
+    }
     if (selected == -1) {
       JOptionPane.showMessageDialog(this, "请选择一个选项后再提交");
       return;
     }
     // 判断对错
-    if (selected == paper.correctIndex[index]) score++;
+    if (selected == paper.correctIndex[index]) {
+      score++;
+    }
 
     index++;
     if (index < paper.size()) {
@@ -100,7 +124,9 @@ public class ExamFrame extends JFrame {
     }
   }
 
-  /** 做完所有题目后显示确认提交界面 */
+  /**
+   * 做完所有题目后显示确认提交界面
+   */
   private void showSubmitPage() {
     // 移除中间题目区域和按钮
     getContentPane().remove(centerPanel);
@@ -134,10 +160,12 @@ public class ExamFrame extends JFrame {
     repaint();
   }
 
-  /** 完成考试 → 进入成绩界面 */
+  /**
+   * 完成考试 → 进入成绩界面
+   */
   private void finishExam() {
     int total = paper.size();
-    double percent = total==0 ? 0 : (100.0 * score / total);
+    double percent = total == 0 ? 0 : (100.0 * score / total);
     dispose();
     new ResultFrame(user, score, total, percent);
   }

src/view/ExamSetupFrame.java

@@ -1,7 +1,16 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.BorderFactory;
+
+import java.awt.GridLayout;
+
 import controller.FunctionController;
 import model.Login;
 import model.LanguageSwitch;
@@ -10,6 +19,7 @@ import model.LanguageSwitch;
  * 出题设置：选择/切换难度（显示当前账户默认难度），输入题数（10-30）
  */
 public class ExamSetupFrame extends JFrame {
+
   private JTextField numberField;
   private JComboBox<String> levelBox;
   private FunctionController controller;
@@ -24,10 +34,10 @@ public class ExamSetupFrame extends JFrame {
     setLocationRelativeTo(null);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
-    JPanel p = new JPanel(new GridLayout(4,2,8,8));
-    p.setBorder(BorderFactory.createEmptyBorder(8,8,8,8));
+    JPanel p = new JPanel(new GridLayout(4, 2, 8, 8));
+    p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
     p.add(new JLabel("当前难度:"));
-    levelBox = new JComboBox<>(new String[]{"小学","初中","高中"});
+    levelBox = new JComboBox<>(new String[]{"小学", "初中", "高中"});
     levelBox.setSelectedItem(LanguageSwitch.levelToChinese(user.level));
     p.add(levelBox);
 
@@ -56,7 +66,10 @@ public class ExamSetupFrame extends JFrame {
       }
     });
 
-    backBtn.addActionListener(e -> { dispose(); new LoginFrame(); });
+    backBtn.addActionListener(e -> {
+      dispose();
+      new LoginFrame();
+    });
 
     setVisible(true);
   }

src/view/LoginFrame.java

@@ -1,9 +1,17 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import java.awt.GridLayout;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.JPasswordField;
+import javax.swing.BorderFactory;
+
 import model.Login;
-import controller.AssignController;
 
 /**
  * 登录窗口
@@ -20,7 +28,7 @@ public class LoginFrame extends JFrame {
     setLocationRelativeTo(null);
 
     JPanel p = new JPanel(new GridLayout(4, 2, 8, 8));
-    p.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
+    p.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
     p.add(new JLabel("用户名:"));
     usernameField = new JTextField();
     p.add(usernameField);
@@ -44,7 +52,8 @@ public class LoginFrame extends JFrame {
       String u = usernameField.getText().trim();
       String pwd = new String(passwordField.getPassword()).trim();
       if (u.isEmpty() || pwd.isEmpty()) {
-        JOptionPane.showMessageDialog(this, "请输入用户名和密码", "提示", JOptionPane.INFORMATION_MESSAGE);
+        JOptionPane.showMessageDialog(this, "请输入用户名和密码", "提示",
+            JOptionPane.INFORMATION_MESSAGE);
         return;
       }
       Login.Account acc = Login.login(u, pwd);
@@ -52,7 +61,8 @@ public class LoginFrame extends JFrame {
         dispose();
         new MainMenuFrame(acc); // 登录后先进入主菜单
       } else {
-        JOptionPane.showMessageDialog(this, "用户名或密码错误", "登录失败", JOptionPane.ERROR_MESSAGE);
+        JOptionPane.showMessageDialog(this, "用户名或密码错误", "登录失败",
+            JOptionPane.ERROR_MESSAGE);
       }
 
     });

src/view/MainMenuFrame.java

@@ -1,56 +1,94 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import java.awt.GridLayout;
+
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JPasswordField;
+import javax.swing.BorderFactory;
+
 import model.Login;
 
+
 /**
- * 登录成功后的主菜单（可修改密码、开始出题、登出）
- * 现在由 ExamSetupFrame 直接替代，但保留此类可拓展
+ * 登录成功后的主菜单（可修改密码、开始出题、登出） 现在由 ExamSetupFrame 直接替代，但保留此类可拓展
  */
 public class MainMenuFrame extends JFrame {
+
   public MainMenuFrame(Login.Account user) {
     setTitle("主菜单 - " + user.username);
-    setSize(400,200);
+    setSize(400, 200);
     setLocationRelativeTo(null);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
-    JPanel p = new JPanel(new GridLayout(3,1,10,10));
+    JPanel p = new JPanel(new GridLayout(3, 1, 10, 10));
     JButton changePwd = new JButton("修改密码");
     JButton start = new JButton("出题设置");
     JButton logout = new JButton("退出登录");
-    p.add(start); p.add(changePwd); p.add(logout);
+    p.add(start);
+    p.add(changePwd);
+    p.add(logout);
     add(p);
 
-    start.addActionListener(e -> { new ExamSetupFrame(user); dispose(); });
+    start.addActionListener(e -> {
+      new ExamSetupFrame(user);
+      dispose();
+    });
     changePwd.addActionListener(e -> new ChangePasswordDialog(this, user));
-    logout.addActionListener(e -> { dispose(); new LoginFrame(); });
+    logout.addActionListener(e -> {
+      dispose();
+      new LoginFrame();
+    });
 
     setVisible(true);
   }
 
   // 内部类：修改密码对话框
   static class ChangePasswordDialog extends JDialog {
+
     public ChangePasswordDialog(JFrame owner, Login.Account user) {
       super(owner, "修改密码", true);
-      setSize(350,200);
+      setSize(350, 200);
       setLocationRelativeTo(owner);
-      JPanel p = new JPanel(new GridLayout(4,2,6,6));
-      p.setBorder(BorderFactory.createEmptyBorder(6,6,6,6));
-      p.add(new JLabel("旧密码:")); JPasswordField oldp = new JPasswordField(); p.add(oldp);
-      p.add(new JLabel("新密码:")); JPasswordField newp = new JPasswordField(); p.add(newp);
-      p.add(new JLabel("再次输入新密码:")); JPasswordField newp2 = new JPasswordField(); p.add(newp2);
-      JButton ok = new JButton("确定"); JButton cancel = new JButton("取消"); p.add(ok); p.add(cancel);
+      JPanel p = new JPanel(new GridLayout(4, 2, 6, 6));
+      p.setBorder(BorderFactory.createEmptyBorder(6, 6, 6, 6));
+      p.add(new JLabel("旧密码:"));
+      JPasswordField oldp = new JPasswordField();
+      p.add(oldp);
+      p.add(new JLabel("新密码:"));
+      JPasswordField newp = new JPasswordField();
+      p.add(newp);
+      p.add(new JLabel("再次输入新密码:"));
+      JPasswordField newp2 = new JPasswordField();
+      p.add(newp2);
+      JButton ok = new JButton("确定");
+      JButton cancel = new JButton("取消");
+      p.add(ok);
+      p.add(cancel);
       add(p);
       ok.addActionListener(a -> {
         String oldPwd = new String(oldp.getPassword()).trim();
         String np = new String(newp.getPassword()).trim();
         String np2 = new String(newp2.getPassword()).trim();
-        if (!np.equals(np2)) { JOptionPane.showMessageDialog(this, "两次密码不一致"); return; }
-        if (!Login.validatePasswordRules(np)) { JOptionPane.showMessageDialog(this, "密码不满足规则"); return; }
+        if (!np.equals(np2)) {
+          JOptionPane.showMessageDialog(this, "两次密码不一致");
+          return;
+        }
+        if (!Login.validatePasswordRules(np)) {
+          JOptionPane.showMessageDialog(this, "密码不满足规则");
+          return;
+        }
         boolean okr = Login.changePassword(user.username, oldPwd, np);
-        if (okr) { JOptionPane.showMessageDialog(this, "修改成功"); dispose(); }
-        else JOptionPane.showMessageDialog(this, "旧密码错误");
+        if (okr) {
+          JOptionPane.showMessageDialog(this, "修改成功");
+          dispose();
+        } else {
+          JOptionPane.showMessageDialog(this, "旧密码错误");
+        }
       });
       cancel.addActionListener(a -> dispose());
       setVisible(true);

src/view/RegisterFrame.java

@@ -1,11 +1,28 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import java.awt.GridLayout;
 import java.util.Properties;
 import java.util.Random;
-import jakarta.mail.*;
-import jakarta.mail.internet.*;
+
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JPasswordField;
+import javax.swing.JTextField;
+import javax.swing.BorderFactory;
+
+import jakarta.mail.Authenticator;
+import jakarta.mail.Message;
+import jakarta.mail.PasswordAuthentication;
+import jakarta.mail.Session;
+import jakarta.mail.Transport;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+
 import model.Login;
 import model.LanguageSwitch;
 
@@ -13,6 +30,7 @@ import model.LanguageSwitch;
  * 注册界面（使用 QQ 邮箱发送验证码）
  */
 public class RegisterFrame extends JDialog {
+
   private JTextField usernameField;
   private JTextField emailField;
   private JComboBox<String> levelBox;
@@ -106,7 +124,7 @@ public class RegisterFrame extends JDialog {
       Login.Level lv = LanguageSwitch.chineseToLevel(levelStr);
       boolean ok = Login.register(u, pwd, lv, email);
       if (!ok) {
-        JOptionPane.showMessageDialog(this, "用户名已存在，请换一个用户名");
+        JOptionPane.showMessageDialog(this, "用户名或邮箱已存在，请换一个用户名");
         return;
       }
       JOptionPane.showMessageDialog(this, "注册成功，请用新用户登录");
@@ -126,7 +144,6 @@ public class RegisterFrame extends JDialog {
       props.put("mail.smtp.auth", "true");
       props.put("mail.smtp.ssl.enable", "true"); // ← 开启 SSL
 
-
       Session session = Session.getInstance(props, new Authenticator() {
         protected PasswordAuthentication getPasswordAuthentication() {
           return new PasswordAuthentication(FROM_EMAIL, AUTH_CODE);

src/view/ResultFrame.java

@@ -1,21 +1,29 @@
 package view;
 
-import javax.swing.*;
-import java.awt.*;
+import java.awt.FlowLayout;
+import java.awt.GridLayout;
+
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
 import model.Login;
 
 /**
  * 显示成绩并提供“退出或继续做题”的选择
  */
 public class ResultFrame extends JFrame {
+
   public ResultFrame(Login.Account user, int score, int total, double percent) {
     setTitle("成绩 - " + user.username);
-    setSize(360,220);
+    setSize(360, 220);
     setLocationRelativeTo(null);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
-    JPanel p = new JPanel(new GridLayout(5,1,6,6));
-    p.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
+    JPanel p = new JPanel(new GridLayout(5, 1, 6, 6));
+    p.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
     p.add(new JLabel("用户名: " + user.username));
     p.add(new JLabel("得分: " + score + " / " + total));
     p.add(new JLabel(String.format("百分比: %.2f%%", percent)));