java连接mysql数据库方法

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 加载数据库驱动
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 建立数据库连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

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

            // 执行SQL查询
            String sql = "SELECT * FROM mytable";
            rs = stmt.executeQuery(sql);

            // 处理查询结果
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                System.out.println("ID: " + id + ", Name: " + name);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭资源
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}