Java 控制台程序 JDBC连接数据库

package com.company;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;

public class Conn {
    // 申明Connection对象
    Connection con;

    /*连接mySql*/
    public  Connection getmySqlConnection(){
        try {
            //加载数据库驱动类
            Class.forName("com.mysql.jdbc.Driver");
            System.out.println("数据库驱动加载成功！");
        }
        catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        try {
            // 通过访问数据库的URL获取数据库连接对象
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDataBase","root","pwd");
            System.out.println("数据库连接成功,哈哈！！");
        }
        catch (SQLException e){
            e.printStackTrace();
        }

        // 返回一个Connection对象
        return con;
    }

    public static void main(String args[]){
        Conn c = new Conn();
        // 调用连接数据库方法
        c.getmySqlConnection();
    }
}

 java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

数据库驱动加载成功！
Mon Dec 03 15:48:56 CST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
数据库连接成功,哈哈！！

 con = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDataBase?useSSL=false","root","pwd");

package com.company;

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

public class Gradation {
    // 申明Connection对象
    static Connection con;
    // 申明Statement对象
    static Statement sql;
    // 申明ResultSet对象
    static ResultSet res;

    public static void main(String args[]){
        // 创建对象
        Gradation c = new Gradation();
        // 与数据连接
        con = new Conn().getmySqlConnection();

        try {
            // 实例化Statement
            sql = con.createStatement();
            // 执行sql语句，返回结果集
            res = sql.executeQuery("select * from tb_user");
            // 如果当前语句不是最后一条，则进入循环
            while (res.next()){
                String name = res.getString("user_name");
                String age = res.getString("user_age");

                System.out.println("姓名："+name+"  年龄："+age);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}