Merge branch 'main' of http://git.innoschool.org:3000/fanxinyao/java

README.md

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+# java
+

w1/HelloWorld.java

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+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}

w1/TemperatureConverter.java

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+import java.util.Scanner;
+
+/**
+ * 温度转换器程序（Java版本）
+ * 支持摄氏度(C)与华氏度(F)之间互转
+ * 
+ * 对应Python原始程序的功能移植
+ */
+public class TemperatureConverter {
+    
+    /**
+     * 将摄氏度转换为华氏度
+     * 
+     * @param c 摄氏温度（浮点数）
+     * @return 对应的华氏温度（浮点数）
+     */
+    public static double celsiusToFahrenheit(double c) {
+        return c * 9.0 / 5.0 + 32.0;
+    }
+    
+    /**
+     * 将华氏度转换为摄氏度
+     * 
+     * @param f 华氏温度（浮点数）
+     * @return 对应的摄氏温度（浮点数）
+     */
+    public static double fahrenheitToCelsius(double f) {
+        return (f - 32.0) * 5.0 / 9.0;
+    }
+    
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        
+        // 提示用户输入，格式示例：“36.6 C”或“97 F”
+        System.out.print("请输入要转换的温度与单位（例如 36.6 C 或 97 F）：");
+        String input = scanner.nextLine().trim();
+        
+        // 检查输入是否为空
+        if (input.isEmpty()) {
+            System.out.println("输入为空，程序退出。");
+            scanner.close();
+            return;
+        }
+        
+        // 按空格分割输入
+        String[] parts = input.split("\\s+");
+        
+        try {
+            // 允许用户输入两个部分：数值与单位
+            double value = Double.parseDouble(parts[0]);
+            String unit = (parts.length > 1) ? parts[1].toUpperCase() : "C";
+            
+            // 判断单位并进行相应转换
+            if (unit.startsWith("C")) {
+                // 从摄氏度转换为华氏度
+                double f = celsiusToFahrenheit(value);
+                System.out.printf("%.2f °C = %.2f °F%n", value, f);
+            } else if (unit.startsWith("F")) {
+                // 从华氏度转换为摄氏度
+                double c = fahrenheitToCelsius(value);
+                System.out.printf("%.2f °F = %.2f °C%n", value, c);
+            } else {
+                System.out.println("未知单位，请使用 C 或 F。");
+            }
+            
+        } catch (NumberFormatException e) {
+            System.out.println("输入解析失败，请按示例输入数值与单位，例如：36.6 C");
+        } catch (ArrayIndexOutOfBoundsException e) {
+            System.out.println("输入格式错误，请按示例输入数值与单位，例如：36.6 C");
+        } finally {
+            scanner.close();
+        }
+    }
+}

w10/Command.java

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+package com.example.datacollect.command;
+
+import com.example.datacollect.repository.ArticleRepository;
+
+public interface Command {
+    String getName();
+    void execute(String[] args, ArticleRepository repository);
+}

w9/Course.java

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+package com.example.entity;
+
+import java.time.LocalDateTime;
+
+/**
+ * 课程实体类
+ * 不依赖Spring Boot，使用普通Java类实现
+ */
+public class Course {
+    private Long id;
+    private String courseCode;
+    private String courseName;
+    private Double credit;
+    private String teacher;
+    private String department;
+    private Integer capacity;
+    private Integer enrolled;
+    private String classTime;
+    private String classRoom;
+    private String courseType;
+    private String semester;
+    private LocalDateTime createTime;
+    
+    public Long getId() {
+        return id;
+    }
+    
+    public void setId(Long id) {
+        this.id = id;
+    }
+    
+    public String getCourseCode() {
+        return courseCode;
+    }
+    
+    public void setCourseCode(String courseCode) {
+        this.courseCode = courseCode;
+    }
+    
+    public String getCourseName() {
+        return courseName;
+    }
+    
+    public void setCourseName(String courseName) {
+        this.courseName = courseName;
+    }
+    
+    public Double getCredit() {
+        return credit;
+    }
+    
+    public void setCredit(Double credit) {
+        this.credit = credit;
+    }
+    
+    public String getTeacher() {
+        return teacher;
+    }
+    
+    public void setTeacher(String teacher) {
+        this.teacher = teacher;
+    }
+    
+    public String getDepartment() {
+        return department;
+    }
+    
+    public void setDepartment(String department) {
+        this.department = department;
+    }
+    
+    public Integer getCapacity() {
+        return capacity;
+    }
+    
+    public void setCapacity(Integer capacity) {
+        this.capacity = capacity;
+    }
+    
+    public Integer getEnrolled() {
+        return enrolled;
+    }
+    
+    public void setEnrolled(Integer enrolled) {
+        this.enrolled = enrolled;
+    }
+    
+    public String getClassTime() {
+        return classTime;
+    }
+    
+    public void setClassTime(String classTime) {
+        this.classTime = classTime;
+    }
+    
+    public String getClassRoom() {
+        return classRoom;
+    }
+    
+    public void setClassRoom(String classRoom) {
+        this.classRoom = classRoom;
+    }
+    
+    public String getCourseType() {
+        return courseType;
+    }
+    
+    public void setCourseType(String courseType) {
+        this.courseType = courseType;
+    }
+    
+    public String getSemester() {
+        return semester;
+    }
+    
+    public void setSemester(String semester) {
+        this.semester = semester;
+    }
+    
+    public LocalDateTime getCreateTime() {
+        return createTime;
+    }
+    
+    public void setCreateTime(LocalDateTime createTime) {
+        this.createTime = createTime;
+    }
+}

w9/CourseAnalysis.java

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+package com.example;
+
+import com.example.entity.Course;
+
+import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.ArrayList;
+import java.util.stream.Collectors;
+
+/**
+ * 课程分析类
+ * 不依赖Spring Boot，使用普通Java类实现
+ */
+public class CourseAnalysis {
+    
+    // 无参构造方法
+    public CourseAnalysis() {
+    }
+    
+    // 获取课程类型分布
+    public Map<String, Integer> getCourseTypeDistribution() {
+        return DatabaseUtil.getCourseTypeDistribution();
+    }
+    
+    // 获取院系课程分布
+    public Map<String, Integer> getDepartmentDistribution() {
+        return DatabaseUtil.getDepartmentDistribution();
+    }
+    
+    // 获取学分分布
+    public Map<Double, Integer> getCreditDistribution() {
+        Map<Double, Integer> distribution = new HashMap<>();
+        List<Course> courses = DatabaseUtil.getAllCourses();
+        
+        for (Course course : courses) {
+            double credit = course.getCredit();
+            distribution.put(credit, distribution.getOrDefault(credit, 0) + 1);
+        }
+        
+        return distribution;
+    }
+    
+    // 获取热门课程
+    public List<Map<String, Object>> getTopCourses() {
+        return DatabaseUtil.getTopCourses();
+    }
+    
+    // 获取课程容量使用率
+    public List<Map<String, Object>> getCourseUsageRate() {
+        List<Map<String, Object>> usageRates = new ArrayList<>();
+        List<Course> courses = DatabaseUtil.getAllCourses();
+        
+        for (Course course : courses) {
+            Map<String, Object> usageRate = new HashMap<>();
+            usageRate.put("courseName", course.getCourseName());
+            usageRate.put("capacity", course.getCapacity());
+            usageRate.put("enrolled", course.getEnrolled());
+            double rate = course.getCapacity() > 0 ? (double) course.getEnrolled() / course.getCapacity() * 100 : 0;
+            usageRate.put("usageRate", rate);
+            usageRates.add(usageRate);
+        }
+        
+        // 按使用率排序
+        usageRates.sort((a, b) -> Double.compare((Double) b.get("usageRate"), (Double) a.get("usageRate")));
+        
+        return usageRates;
+    }
+    
+    // 获取整体统计信息
+    public Map<String, Object> getOverallStatistics() {
+        Map<String, Object> statistics = new HashMap<>();
+        try {
+            List<Course> allCourses = DatabaseUtil.getAllCourses();
+            
+            // 总课程数
+            statistics.put("totalCourses", allCourses.size());
+            
+            // 总学分
+            double totalCredits = allCourses.stream()
+                    .mapToDouble(Course::getCredit)
+                    .sum();
+            statistics.put("totalCredits", totalCredits);
+            
+            // 平均学分
+            double avgCredit = allCourses.isEmpty() ? 0 : totalCredits / allCourses.size();
+            statistics.put("averageCredit", avgCredit);
+            
+            // 总容量
+            int totalCapacity = allCourses.stream()
+                    .mapToInt(Course::getCapacity)
+                    .sum();
+            statistics.put("totalCapacity", totalCapacity);
+            
+            // 总已选人数
+            int totalEnrolled = allCourses.stream()
+                    .mapToInt(Course::getEnrolled)
+                    .sum();
+            statistics.put("totalEnrolled", totalEnrolled);
+            
+            // 总体使用率
+            double overallUsageRate = totalCapacity > 0 ? (double) totalEnrolled / totalCapacity * 100 : 0;
+            statistics.put("overallUsageRate", overallUsageRate);
+            
+            // 课程类型数量
+            long requiredCourses = allCourses.stream()
+                    .filter(course -> "必修课".equals(course.getCourseType()))
+                    .count();
+            statistics.put("requiredCourses", requiredCourses);
+            
+            long electiveCourses = allCourses.stream()
+                    .filter(course -> "选修课".equals(course.getCourseType()))
+                    .count();
+            statistics.put("electiveCourses", electiveCourses);
+            
+            // 院系数量
+            long departmentCount = allCourses.stream()
+                    .map(Course::getDepartment)
+                    .distinct()
+                    .count();
+            statistics.put("departmentCount", departmentCount);
+        } catch (Exception e) {
+            System.err.println("获取整体统计信息失败：" + e.getMessage());
+            // 返回默认值
+            statistics.put("totalCourses", 0);
+            statistics.put("totalCredits", 0.0);
+            statistics.put("averageCredit", 0.0);
+            statistics.put("totalCapacity", 0);
+            statistics.put("totalEnrolled", 0);
+            statistics.put("overallUsageRate", 0.0);
+            statistics.put("requiredCourses", 0);
+            statistics.put("electiveCourses", 0);
+            statistics.put("departmentCount", 0);
+        }
+        return statistics;
+    }
+    
+    // 获取按院系分组的课程统计
+    public Map<String, Map<String, Object>> getDepartmentStatistics() {
+        Map<String, Map<String, Object>> deptStats = new HashMap<>();
+        try {
+            List<Course> allCourses = DatabaseUtil.getAllCourses();
+            
+            // 按院系分组
+            Map<String, List<Course>> coursesByDept = allCourses.stream()
+                    .collect(Collectors.groupingBy(Course::getDepartment));
+            
+            for (Map.Entry<String, List<Course>> entry : coursesByDept.entrySet()) {
+                String department = entry.getKey();
+                List<Course> deptCourses = entry.getValue();
+                
+                Map<String, Object> stats = new HashMap<>();
+                stats.put("courseCount", deptCourses.size());
+                
+                double deptCredits = deptCourses.stream()
+                        .mapToDouble(Course::getCredit)
+                        .sum();
+                stats.put("totalCredits", deptCredits);
+                
+                int deptCapacity = deptCourses.stream()
+                        .mapToInt(Course::getCapacity)
+                        .sum();
+                stats.put("totalCapacity", deptCapacity);
+                
+                int deptEnrolled = deptCourses.stream()
+                        .mapToInt(Course::getEnrolled)
+                        .sum();
+                stats.put("totalEnrolled", deptEnrolled);
+                
+                double deptUsageRate = deptCapacity > 0 ? (double) deptEnrolled / deptCapacity * 100 : 0;
+                stats.put("usageRate", deptUsageRate);
+                
+                deptStats.put(department, stats);
+            }
+        } catch (Exception e) {
+            System.err.println("获取院系统计信息失败：" + e.getMessage());
+        }
+        return deptStats;
+    }
+    
+    // 获取教师课程统计
+    public Map<String, Map<String, Object>> getTeacherStatistics() {
+        Map<String, Map<String, Object>> teacherStats = new HashMap<>();
+        try {
+            List<Course> allCourses = DatabaseUtil.getAllCourses();
+            
+            // 按教师分组
+            Map<String, List<Course>> coursesByTeacher = allCourses.stream()
+                    .collect(Collectors.groupingBy(Course::getTeacher));
+            
+            for (Map.Entry<String, List<Course>> entry : coursesByTeacher.entrySet()) {
+                String teacher = entry.getKey();
+                List<Course> teacherCourses = entry.getValue();
+                
+                Map<String, Object> stats = new HashMap<>();
+                stats.put("courseCount", teacherCourses.size());
+                
+                double totalCredits = teacherCourses.stream()
+                        .mapToDouble(Course::getCredit)
+                        .sum();
+                stats.put("totalCredits", totalCredits);
+                
+                int totalEnrolled = teacherCourses.stream()
+                        .mapToInt(Course::getEnrolled)
+                        .sum();
+                stats.put("totalEnrolled", totalEnrolled);
+                
+                teacherStats.put(teacher, stats);
+            }
+        } catch (Exception e) {
+            System.err.println("获取教师统计信息失败：" + e.getMessage());
+        }
+        return teacherStats;
+    }
+    
+    // 获取课程容量利用率分析
+    public Map<String, Object> getCapacityAnalysis() {
+        Map<String, Object> analysis = new HashMap<>();
+        try {
+            List<Course> allCourses = DatabaseUtil.getAllCourses();
+            
+            int totalCapacity = allCourses.stream()
+                    .mapToInt(Course::getCapacity)
+                    .sum();
+            
+            int totalEnrolled = allCourses.stream()
+                    .mapToInt(Course::getEnrolled)
+                    .sum();
+            
+            int availableCapacity = totalCapacity - totalEnrolled;
+            
+            // 计算不同使用率区间的课程数量
+            long highUsage = allCourses.stream()
+                    .filter(course -> course.getCapacity() > 0 && 
+                            (double) course.getEnrolled() / course.getCapacity() >= 0.9)
+                    .count();
+            
+            long mediumUsage = allCourses.stream()
+                    .filter(course -> course.getCapacity() > 0 && 
+                            (double) course.getEnrolled() / course.getCapacity() >= 0.5 && 
+                            (double) course.getEnrolled() / course.getCapacity() < 0.9)
+                    .count();
+            
+            long lowUsage = allCourses.stream()
+                    .filter(course -> course.getCapacity() > 0 && 
+                            (double) course.getEnrolled() / course.getCapacity() < 0.5)
+                    .count();
+            
+            analysis.put("totalCapacity", totalCapacity);
+            analysis.put("totalEnrolled", totalEnrolled);
+            analysis.put("availableCapacity", availableCapacity);
+            analysis.put("highUsageCourses", highUsage);
+            analysis.put("mediumUsageCourses", mediumUsage);
+            analysis.put("lowUsageCourses", lowUsage);
+            
+        } catch (Exception e) {
+            System.err.println("获取容量分析失败：" + e.getMessage());
+        }
+        return analysis;
+    }
+}

w9/CourseSystemTest.java

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+package com.example;
+
+import com.example.entity.Course;
+
+/**
+ * 测试类，用于验证湖大选课系统功能
+ */
+public class CourseSystemTest {
+    
+    public static void main(String[] args) {
+        // 初始化数据库
+        DatabaseUtil.initDatabase();
+        
+        // 清空现有数据
+        DatabaseUtil.clearCourses();
+        
+        // 添加测试数据
+        addTestData();
+        
+        // 创建CourseAnalysis实例
+        CourseAnalysis analysis = new CourseAnalysis();
+        
+        // 测试整体统计信息
+        System.out.println("===== 测试整体统计信息 =====");
+        System.out.println(analysis.getOverallStatistics());
+        
+        // 测试课程类型分布
+        System.out.println("\n===== 测试课程类型分布 =====");
+        System.out.println(analysis.getCourseTypeDistribution());
+        
+        // 测试院系统计
+        System.out.println("\n===== 测试院系统计 =====");
+        System.out.println(analysis.getDepartmentDistribution());
+        
+        // 测试学分分布
+        System.out.println("\n===== 测试学分分布 =====");
+        System.out.println(analysis.getCreditDistribution());
+        
+        // 测试热门课程
+        System.out.println("\n===== 测试热门课程 =====");
+        System.out.println(analysis.getTopCourses());
+        
+        // 测试课程容量使用率
+        System.out.println("\n===== 测试课程容量使用率 =====");
+        System.out.println(analysis.getCourseUsageRate());
+        
+        // 测试按院系分组的统计
+        System.out.println("\n===== 测试按院系分组的统计 =====");
+        System.out.println(analysis.getDepartmentStatistics());
+        
+        // 测试教师课程统计
+        System.out.println("\n===== 测试教师课程统计 =====");
+        System.out.println(analysis.getTeacherStatistics());
+        
+        // 测试课程容量利用率分析
+        System.out.println("\n===== 测试课程容量利用率分析 =====");
+        System.out.println(analysis.getCapacityAnalysis());
+        
+        System.out.println("\n===== 测试完成 =====");
+    }
+    
+    // 添加测试数据
+    private static void addTestData() {
+        Course course1 = new Course();
+        course1.setCourseCode("CS101");
+        course1.setCourseName("计算机科学导论");
+        course1.setCredit(3.0);
+        course1.setTeacher("张教授");
+        course1.setDepartment("计算机学院");
+        course1.setCapacity(100);
+        course1.setEnrolled(95);
+        course1.setClassTime("周一 8:00-10:00");
+        course1.setClassRoom("A101");
+        course1.setCourseType("必修课");
+        course1.setSemester("2024春季");
+        DatabaseUtil.saveCourse(course1);
+        
+        Course course2 = new Course();
+        course2.setCourseCode("CS102");
+        course2.setCourseName("数据结构");
+        course2.setCredit(4.0);
+        course2.setTeacher("李教授");
+        course2.setDepartment("计算机学院");
+        course2.setCapacity(80);
+        course2.setEnrolled(75);
+        course2.setClassTime("周二 10:00-12:00");
+        course2.setClassRoom("A102");
+        course2.setCourseType("必修课");
+        course2.setSemester("2024春季");
+        DatabaseUtil.saveCourse(course2);
+        
+        Course course3 = new Course();
+        course3.setCourseCode("MATH101");
+        course3.setCourseName("高等数学");
+        course3.setCredit(5.0);
+        course3.setTeacher("王教授");
+        course3.setDepartment("数学学院");
+        course3.setCapacity(120);
+        course3.setEnrolled(110);
+        course3.setClassTime("周三 8:00-10:00");
+        course3.setClassRoom("B101");
+        course3.setCourseType("必修课");
+        course3.setSemester("2024春季");
+        DatabaseUtil.saveCourse(course3);
+        
+        Course course4 = new Course();
+        course4.setCourseCode("ENG101");
+        course4.setCourseName("大学英语");
+        course4.setCredit(2.0);
+        course4.setTeacher("刘教授");
+        course4.setDepartment("外国语学院");
+        course4.setCapacity(150);
+        course4.setEnrolled(120);
+        course4.setClassTime("周四 14:00-16:00");
+        course4.setClassRoom("C101");
+        course4.setCourseType("选修课");
+        course4.setSemester("2024春季");
+        DatabaseUtil.saveCourse(course4);
+        
+        Course course5 = new Course();
+        course5.setCourseCode("PHYS101");
+        course5.setCourseName("大学物理");
+        course5.setCredit(4.0);
+        course5.setTeacher("陈教授");
+        course5.setDepartment("物理学院");
+        course5.setCapacity(90);
+        course5.setEnrolled(85);
+        course5.setClassTime("周五 10:00-12:00");
+        course5.setClassRoom("D101");
+        course5.setCourseType("必修课");
+        course5.setSemester("2024春季");
+        DatabaseUtil.saveCourse(course5);
+        
+        System.out.println("测试数据添加完成，共添加 5 门课程");
+    }
+}

w9/DatabaseUtil.java

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+package com.example;
+
+import com.example.entity.Course;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
+
+/**
+ * 数据库工具类
+ * 提供数据库操作相关方法
+ */
+public class DatabaseUtil {
+    // 数据库URL
+    private static final String DB_URL = "jdbc:sqlite:course.db";
+    
+    // 静态初始化块，加载SQLite驱动
+    static {
+        try {
+            Class.forName("org.sqlite.JDBC");
+            System.out.println("SQLite驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.err.println("SQLite驱动加载失败: " + e.getMessage());
+        }
+    }
+    
+    // 初始化数据库
+    public static void initDatabase() {
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement()) {
+            
+            // 创建courses表
+            String createTableSQL = "CREATE TABLE IF NOT EXISTS courses (" +
+                    "id INTEGER PRIMARY KEY AUTOINCREMENT," +
+                    "course_code TEXT," +
+                    "course_name TEXT," +
+                    "credit REAL," +
+                    "teacher TEXT," +
+                    "department TEXT," +
+                    "capacity INTEGER," +
+                    "enrolled INTEGER," +
+                    "class_time TEXT," +
+                    "class_room TEXT," +
+                    "course_type TEXT," +
+                    "semester TEXT," +
+                    "create_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP" +
+                    ")";
+            stmt.executeUpdate(createTableSQL);
+            
+            System.out.println("数据库初始化成功");
+        } catch (SQLException e) {
+            System.err.println("数据库初始化失败: " + e.getMessage());
+        }
+    }
+    
+    // 获取所有课程
+    public static List<Course> getAllCourses() {
+        List<Course> courses = new ArrayList<>();
+        String sql = "SELECT * FROM courses";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
+            
+            while (rs.next()) {
+                Course course = new Course();
+                course.setId(rs.getLong("id"));
+                course.setCourseCode(rs.getString("course_code"));
+                course.setCourseName(rs.getString("course_name"));
+                course.setCredit(rs.getDouble("credit"));
+                course.setTeacher(rs.getString("teacher"));
+                course.setDepartment(rs.getString("department"));
+                course.setCapacity(rs.getInt("capacity"));
+                course.setEnrolled(rs.getInt("enrolled"));
+                course.setClassTime(rs.getString("class_time"));
+                course.setClassRoom(rs.getString("class_room"));
+                course.setCourseType(rs.getString("course_type"));
+                course.setSemester(rs.getString("semester"));
+                courses.add(course);
+            }
+        } catch (SQLException e) {
+            System.err.println("获取课程列表失败: " + e.getMessage());
+        }
+        
+        return courses;
+    }
+    
+    // 获取课程类型分布
+    public static Map<String, Integer> getCourseTypeDistribution() {
+        Map<String, Integer> distribution = new HashMap<>();
+        String sql = "SELECT course_type, COUNT(*) as count FROM courses GROUP BY course_type";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
+            
+            while (rs.next()) {
+                String type = rs.getString("course_type");
+                int count = rs.getInt("count");
+                distribution.put(type, count);
+            }
+        } catch (SQLException e) {
+            System.err.println("获取课程类型分布失败: " + e.getMessage());
+        }
+        
+        return distribution;
+    }
+    
+    // 获取院系分布
+    public static Map<String, Integer> getDepartmentDistribution() {
+        Map<String, Integer> distribution = new HashMap<>();
+        String sql = "SELECT department, COUNT(*) as count FROM courses GROUP BY department";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
+            
+            while (rs.next()) {
+                String department = rs.getString("department");
+                int count = rs.getInt("count");
+                distribution.put(department, count);
+            }
+        } catch (SQLException e) {
+            System.err.println("获取院系分布失败: " + e.getMessage());
+        }
+        
+        return distribution;
+    }
+    
+    // 获取热门课程
+    public static List<Map<String, Object>> getTopCourses() {
+        List<Map<String, Object>> topCourses = new ArrayList<>();
+        String sql = "SELECT course_name, teacher, department, capacity, enrolled FROM courses ORDER BY enrolled DESC LIMIT 10";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
+            
+            while (rs.next()) {
+                Map<String, Object> course = new HashMap<>();
+                course.put("courseName", rs.getString("course_name"));
+                course.put("teacher", rs.getString("teacher"));
+                course.put("department", rs.getString("department"));
+                course.put("capacity", rs.getInt("capacity"));
+                course.put("enrolled", rs.getInt("enrolled"));
+                topCourses.add(course);
+            }
+        } catch (SQLException e) {
+            System.err.println("获取热门课程失败: " + e.getMessage());
+        }
+        
+        return topCourses;
+    }
+    
+    // 保存课程
+    public static void saveCourse(Course course) {
+        String sql = "INSERT INTO courses (course_code, course_name, credit, teacher, department, capacity, enrolled, class_time, class_room, course_type, semester) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+            
+            pstmt.setString(1, course.getCourseCode());
+            pstmt.setString(2, course.getCourseName());
+            pstmt.setDouble(3, course.getCredit());
+            pstmt.setString(4, course.getTeacher());
+            pstmt.setString(5, course.getDepartment());
+            pstmt.setInt(6, course.getCapacity());
+            pstmt.setInt(7, course.getEnrolled());
+            pstmt.setString(8, course.getClassTime());
+            pstmt.setString(9, course.getClassRoom());
+            pstmt.setString(10, course.getCourseType());
+            pstmt.setString(11, course.getSemester());
+            
+            pstmt.executeUpdate();
+        } catch (SQLException e) {
+            System.err.println("保存课程失败: " + e.getMessage());
+        }
+    }
+    
+    // 清空课程数据
+    public static void clearCourses() {
+        String sql = "DELETE FROM courses";
+        
+        try (Connection conn = DriverManager.getConnection(DB_URL);
+             Statement stmt = conn.createStatement()) {
+            
+            stmt.executeUpdate(sql);
+            System.out.println("课程数据清空成功");
+        } catch (SQLException e) {
+            System.err.println("清空课程数据失败: " + e.getMessage());
+        }
+    }
+}

w9/HnuCourseSystem.java

@@ -0,0 +1,127 @@
+package com.example;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Scanner;
+
+/**
+ * 湖大选课系统主应用类
+ * 不依赖Spring Boot，使用普通Java类实现
+ */
+public class HnuCourseSystem {
+    
+    public static void main(String[] args) {
+        // 初始化数据库
+        DatabaseUtil.initDatabase();
+        
+        // 创建CourseAnalysis实例
+        CourseAnalysis analysis = new CourseAnalysis();
+        
+        // 显示菜单
+        try (Scanner scanner = new Scanner(System.in)) {
+            int choice;
+            
+            do {
+                System.out.println("===== 湖大选课系统 =====");
+                System.out.println("1. 查看整体统计信息");
+                System.out.println("2. 查看课程类型分布");
+                System.out.println("3. 查看院系统计");
+                System.out.println("4. 查看学分分布");
+                System.out.println("5. 查看热门课程");
+                System.out.println("6. 查看课程容量使用率");
+                System.out.println("7. 查看按院系分组的统计");
+                System.out.println("0. 退出系统");
+                System.out.print("请选择操作: ");
+                
+                choice = scanner.nextInt();
+                scanner.nextLine(); // 消费换行符
+                
+                switch (choice) {
+                    case 1 -> {
+                        // 查看整体统计信息
+                        System.out.println("\n整体统计信息:");
+                        Map<String, Object> overallStats = analysis.getOverallStatistics();
+                        for (Map.Entry<String, Object> entry : overallStats.entrySet()) {
+                            System.out.println(entry.getKey() + ": " + entry.getValue());
+                        }
+                    }
+                    
+                    case 2 -> {
+                        // 查看课程类型分布
+                        System.out.println("\n课程类型分布:");
+                        Map<String, Integer> typeDistribution = analysis.getCourseTypeDistribution();
+                        for (Map.Entry<String, Integer> entry : typeDistribution.entrySet()) {
+                            System.out.println(entry.getKey() + ": " + entry.getValue());
+                        }
+                    }
+                    
+                    case 3 -> {
+                        // 查看院系统计
+                        System.out.println("\n院系统计:");
+                        Map<String, Integer> deptDistribution = analysis.getDepartmentDistribution();
+                        for (Map.Entry<String, Integer> entry : deptDistribution.entrySet()) {
+                            System.out.println(entry.getKey() + ": " + entry.getValue());
+                        }
+                    }
+                    
+                    case 4 -> {
+                        // 查看学分分布
+                        System.out.println("\n学分分布:");
+                        Map<Double, Integer> creditDistribution = analysis.getCreditDistribution();
+                        for (Map.Entry<Double, Integer> entry : creditDistribution.entrySet()) {
+                            System.out.println(entry.getKey() + "学分: " + entry.getValue() + "门");
+                        }
+                    }
+                    
+                    case 5 -> {
+                        // 查看热门课程
+                        System.out.println("\n热门课程:");
+                        List<Map<String, Object>> topCourses = analysis.getTopCourses();
+                        for (int i = 0; i < topCourses.size(); i++) {
+                            Map<String, Object> course = topCourses.get(i);
+                            System.out.println((i + 1) + ". " + course.get("courseName") + " - " + course.get("teacher"));
+                            System.out.println("   院系: " + course.get("department") + ", 容量: " + course.get("capacity") + ", 已选: " + course.get("enrolled"));
+                        }
+                    }
+                    
+                    case 6 -> {
+                        // 查看课程容量使用率
+                        System.out.println("\n课程容量使用率:");
+                        List<Map<String, Object>> usageRates = analysis.getCourseUsageRate();
+                        for (int i = 0; i < Math.min(10, usageRates.size()); i++) {
+                            Map<String, Object> usage = usageRates.get(i);
+                            System.out.println((i + 1) + ". " + usage.get("courseName"));
+                            System.out.println("   容量: " + usage.get("capacity") + ", 已选: " + usage.get("enrolled") + ", 使用率: " + String.format("%.2f%%", usage.get("usageRate")));
+                        }
+                    }
+                    
+                    case 7 -> {
+                        // 查看按院系分组的统计
+                        System.out.println("\n按院系分组的统计:");
+                        Map<String, Map<String, Object>> deptStats = analysis.getDepartmentStatistics();
+                        for (Map.Entry<String, Map<String, Object>> entry : deptStats.entrySet()) {
+                            String department = entry.getKey();
+                            Map<String, Object> stats = entry.getValue();
+                            System.out.println("院系: " + department);
+                            System.out.println("  课程数量: " + stats.get("courseCount"));
+                            System.out.println("  总学分: " + stats.get("totalCredits"));
+                            System.out.println("  总容量: " + stats.get("totalCapacity"));
+                            System.out.println("  总已选人数: " + stats.get("totalEnrolled"));
+                            System.out.println("  使用率: " + String.format("%.2f%%", stats.get("usageRate")));
+                        }
+                    }
+                    
+                    case 0 -> System.out.println("退出系统...");
+                    
+                    default -> System.out.println("无效选择，请重新输入");
+                }
+                
+                if (choice != 0) {
+                    System.out.println("\n按Enter键继续...");
+                    scanner.nextLine();
+                }
+                
+            } while (choice != 0);
+        }
+    }
+}

w9/Pair.java

@@ -0,0 +1,89 @@
+package com.example;
+
+/**
+ * 泛型Pair类，用于存储两个不同类型的值
+ * @param <K> 键的类型
+ * @param <V> 值的类型
+ */
+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    /**
+     * 构造方法
+     * @param key 键
+     * @param value 值
+     */
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    /**
+     * 获取键
+     * @return 键
+     */
+    public K getKey() {
+        return key;
+    }
+
+    /**
+     * 设置键
+     * @param key 键
+     */
+    public void setKey(K key) {
+        this.key = key;
+    }
+
+    /**
+     * 获取值
+     * @return 值
+     */
+    public V getValue() {
+        return value;
+    }
+
+    /**
+     * 设置值
+     * @param value 值
+     */
+    public void setValue(V value) {
+        this.value = value;
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" +
+                "key=" + key +
+                ", value=" + value +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        if (key != null ? !key.equals(pair.key) : pair.key != null) return false;
+        return value != null ? value.equals(pair.value) : pair.value == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = key != null ? key.hashCode() : 0;
+        result = 31 * result + (value != null ? value.hashCode() : 0);
+        return result;
+    }
+
+    /**
+     * 静态工厂方法，创建Pair实例
+     * @param key 键
+     * @param value 值
+     * @param <K> 键的类型
+     * @param <V> 值的类型
+     * @return Pair实例
+     */
+    public static <K, V> Pair<K, V> of(K key, V value) {
+        return new Pair<>(key, value);
+    }
+}

w9/pom.xml

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example</groupId>
+    <artifactId>hnu-course-analysis</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>湖南大学选课系统信息爬取与分析</name>
+    <description>湖南大学选课系统课程信息爬取、整理与可视化分析系统</description>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <sqlite.version>3.44.1.0</sqlite.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>${sqlite.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>2.0.13</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <mainClass>com.example.CourseSystemTest</mainClass>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>