大学生班级管理系统 功能模块分为 班级人员管理 以及班级留言功能 用Java代码实现

好的，下面我给您提供一些大学生班级管理系统的Java代码实现的示例。

1. 班级人员管理

首先，您需要创建一个数据模型类来表示班级成员信息。例如：

public class Student {
    private int id;
    private String name;
    private String gender;
    private String major;
    private String grade;
    private String phone;

    // 省略getter和setter方法
}

然后，您可以创建一个DAO类来操作班级成员信息。例如：

public class StudentDAO {
    // 数据库连接信息
    private String url = "jdbc:mysql://localhost:3306/class_management";
    private String username = "root";
    private String password = "123456";

    // 添加新成员
    public void addStudent(Student student) throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "INSERT INTO student (name, gender, major, grade, phone) VALUES (?, ?, ?, ?, ?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, student.getName());
        pstmt.setString(2, student.getGender());
        pstmt.setString(3, student.getMajor());
        pstmt.setString(4, student.getGrade());
        pstmt.setString(5, student.getPhone());
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    }

    // 删除成员
    public void deleteStudent(int id) throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "DELETE FROM student WHERE id = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, id);
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    }

    // 更新成员信息
    public void updateStudent(Student student) throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "UPDATE student SET name = ?, gender = ?, major = ?, grade = ?, phone = ? WHERE id = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, student.getName());
        pstmt.setString(2, student.getGender());
        pstmt.setString(3, student.getMajor());
        pstmt.setString(4, student.getGrade());
        pstmt.setString(5, student.getPhone());
        pstmt.setInt(6, student.getId());
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    }

    // 查询班级成员列表
    public List<Student> getStudentList() throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "SELECT * FROM student";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        ResultSet rs = pstmt.executeQuery();
        List<Student> list = new ArrayList<Student>();
        while (rs.next()) {
            Student student = new Student();
            student.setId(rs.getInt("id"));
            student.setName(rs.getString("name"));
            student.setGender(rs.getString("gender"));
            student.setMajor(rs.getString("major"));
            student.setGrade(rs.getString("grade"));
            student.setPhone(rs.getString("phone"));
            list.add(student);
        }
        rs.close();
        pstmt.close();
        conn.close();
        return list;
    }
}

请注意，这里使用了JDBC API来连接和操作MySQL数据库。

2. 班级留言功能

对于班级留言功能，您可以创建一个数据模型类来表示留言信息。例如：

public class Message {
    private int id;
    private String content;
    private String author;
    private Date createTime;

    // 省略getter和setter方法
}

然后，您可以创建一个DAO类来操作留言信息。例如：

public class MessageDAO {
    // 数据库连接信息
    private String url = "jdbc:mysql://localhost:3306/class_management";
    private String username = "root";
    private String password = "123456";

    // 发布留言
    public void addMessage(Message message) throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "INSERT INTO message (content, author, create_time) VALUES (?, ?, ?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, message.getContent());
        pstmt.setString(2, message.getAuthor());
        pstmt.setTimestamp(3, new Timestamp(message.getCreateTime().getTime()));
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    }

    // 删除留言
    public void deleteMessage(int id) throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "DELETE FROM message WHERE id = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, id);
        pstmt.executeUpdate();
        pstmt.close();
        conn.close();
    }

    // 查询留言列表
    public List<Message> getMessageList() throws SQLException {
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "SELECT * FROM message";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        ResultSet rs = pstmt.executeQuery();
        List<Message> list = new ArrayList<Message>();
        while (rs.next()) {
            Message message = new Message();
            message.setId(rs.getInt("id"));
            message.setContent(rs.getString("content"));
            message.setAuthor(rs.getString("author"));
            message.setCreateTime(rs.getTimestamp("create_time"));
            list.add(message);
        }
        rs.close();
        pstmt.close();
        conn.close();
        return list;
    }
}

请注意，这里使用了JDBC API来连接和操作MySQL数据库。

希望这些示例代码能够帮助到您实现大学生班级管理系统的Java代码！