Java连接MySQL数据库（jdbc连接数据库）

一、实现代码

package com.xtd.utils.sql;

import java.sql.*;

public class DBUtil {

	// 定义连接常量
	private static final String DRIVER = "com.mysql.cj.jdbc.Driver";
//    private static final String URL = "jdbc:mysql://192.168.0.1:3306/sea?useSSL=true&useUnicode=true&characterEncoding=UTF-8";
    private static final String URL = "jdbc:mysql://192.168.0.1:3306/sea?characterEncoding=utf8&autoReconnect=true&serverTimezone=UTC";
    private static final String USER = "root";
    private static final String PASSWORD = "root";

    public static Connection conn = getConnection();
    // 测试
	public static void main(String[] args) throws SQLException {
		if( null != conn) System.out.println(conn);
		conn = null;
		conn = DBUtil.conn;
		System.out.println(conn);
	}

    // jdbc连接MySQL
    private static Connection getConnection() {
		if(null != conn) return conn;
    	try {
			Class.forName(DRIVER);
			conn = DriverManager.getConnection(URL, USER, PASSWORD);
			if(null != conn) System.out.println("MySQL数据库连接成功！");
		} catch (SQLException | ClassNotFoundException e) {
			e.printStackTrace();
		}
    	return conn;
    }

}

 

二、前置条件

1、MySQL连接jar包

  	<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
	<dependency>
	    <groupId>mysql</groupId>
	    <artifactId>mysql-connector-java</artifactId>
	    <!-- <version>5.1.47</version> -->
        <version>8.0.18</version>
	</dependency>

2、MySQL数据库配置

（1）账户密码 （2）数据库名

三、运行结果