JAVA学生信息管理系统GUI界面连接MYSQL代码

以下是一个简单的Java学生信息管理系统GUI界面连接MySQL数据库的代码示例：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;

public class StudentDAO {
    private static final String DRIVER_CLASS = "com.mysql.jdbc.Driver";
    private static final String URL = "jdbc:mysql://localhost:3306/studentdb";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "password";

    public static Connection getConnection() throws SQLException {
        try {
            Class.forName(DRIVER_CLASS);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return DriverManager.getConnection(URL, USERNAME, PASSWORD);
    }

    public static List<Student> getAllStudents() {
        List<Student> students = new ArrayList<Student>();
        try {
            Connection conn = getConnection();
            PreparedStatement ps = conn.prepareStatement("SELECT * FROM student");
            ResultSet rs = ps.executeQuery();
            while (rs.next()) {
                Student s = new Student(rs.getInt("id"), rs.getString("name"), rs.getInt("age"),
                        rs.getString("gender"), rs.getString("major"));
                students.add(s);
            }
            rs.close();
            ps.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return students;
    }

    public static void addStudent(Student s) {
        try {
            Connection conn = getConnection();
            PreparedStatement ps = conn.prepareStatement("INSERT INTO student (name, age, gender, major) VALUES (?, ?, ?, ?)");
            ps.setString(1, s.getName());
            ps.setInt(2, s.getAge());
            ps.setString(3, s.getGender());
            ps.setString(4, s.getMajor());
            ps.executeUpdate();
            ps.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void updateStudent(Student s) {
        try {
            Connection conn = getConnection();
            PreparedStatement ps = conn.prepareStatement("UPDATE student SET name = ?, age = ?, gender = ?, major = ? WHERE id = ?");
            ps.setString(1, s.getName());
            ps.setInt(2, s.getAge());
            ps.setString(3, s.getGender());
            ps.setString(4, s.getMajor());
            ps.setInt(5, s.getId());
            ps.executeUpdate();
            ps.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void deleteStudent(Student s) {
        try {
            Connection conn = getConnection();
            PreparedStatement ps = conn.prepareStatement("DELETE FROM student WHERE id = ?");
            ps.setInt(1, s.getId());
            ps.executeUpdate();
            ps.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

这个示例代码中，我们定义了一个 `StudentDAO` 类，其中包含了对 MySQL 数据库的连接、查询、插入、更新和删除操作。在这个类中，我们使用了 `PreparedStatement` 对象来执行 SQL 命令，这样可以避免 SQL 注入攻击。同时，我们还定义了一个 `Student` 类，表示一个学生信息。在 `getAllStudents()` 方法中，我们使用了 `ResultSet` 对象来获取查询结果，并将结果封装成 `Student` 对象的集合返回。在其他的方法中，我们使用了 `PreparedStatement` 对象来执行对数据库的增、删、改操作。