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数据库驱动：如声卡、显卡一样，安装后需要驱动。Java连接数据库时候需要下载驱动

2、导入jar包

package JDBC;import java.sql.*;public class Demo1 {
       public static void main(String[] args) throws ClassNotFoundException, SQLException {
           //加载驱动        Class.forName("com.mysql.cj.jdbc.Driver");        //用户信息和URL        String url="jdbc:mysql://localhost:3306/jdbcstudent?useUnicode=true&useSSL=true&characterEncoding=utf8&serverTimezone=GMT%2B8";        String username="root";        String password="123456";        //连接成功，数据库对象        Connection connection=DriverManager.getConnection(url,username,password);        //执行sql对象        Statement statement=connection.createStatement();        String sql="select * from users";        ResultSet resultSet=statement.executeQuery(sql);        while (resultSet.next()){
               System.out.println("id="+resultSet.getObject("id"));            System.out.println("name="+resultSet.getObject("name"));            System.out.println("password="+resultSet.getObject("password"));            System.out.println("birthday="+resultSet.getObject("birthday"));        }        //释放连接        resultSet.close();        statement.close();        connection.close();    }}

注意： 1、若是版本低的MySQL文件安装版本高的驱动程序：需要加 .cj

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

2、若是运行出现这个错误：

Exception in thread "main" java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specific time zone value if you want to utilize time zone support.

只需要： 在URL中加入 &serverTimezone=GMT%2B8

运行结果如下：

id=1name=zhangsanpassword=123456birthday=1980-12-04id=2name=lisipassword=123456birthday=1981-12-04id=3name=wangwupassword=123456birthday=1979-12-04

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