1.首先创建Maven文件

2.在pom.xml里添加代码，配置连接MySQL数据库所需要的配置文件。

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
    </dependencies>

3.ctrl +shift +o安装包和依赖

或者右键单击reload project，选择如图

4.编辑Test代码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Test {
    public static void main(String[] args) {
        try {
            String url = "jdbc:mysql://localhost:3306/ceshi?useSSL=false";
            String uname = "root"; // 用户名
            String pwd = "123456"; // 密码
            String sql = "select id, NAME, PASSWORD from u";

            // 加载 MySQL 驱动
            Class.forName("com.mysql.jdbc.Driver");

            // 获取数据库连接
            Connection conn = DriverManager.getConnection(url, uname, pwd);

            // 创建 Statement 对象
            Statement stmt = conn.createStatement();

            // 执行查询
            ResultSet rs = stmt.executeQuery(sql);

            // 处理结果集
            while (rs.next()) {
                int id = rs.getInt("id");
                String username = rs.getString("NAME");
                String password = rs.getString("PASSWORD");
                System.out.println("ID: " + id + ", Username: " + username + ", Password: " + password);
            }

            // 关闭资源
            rs.close();
            stmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

5.显示如图即成功