Communications link failure

package com.imooc.jdbc;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import org.junit.Test;

import com.mysql.cj.jdbc.Driver;

public class jdbcDemo1 {

@Test

public void demo1() {

//1.加载驱动

try {

DriverManager.registerDriver(new Driver());

//2.获得链接

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:33006","root","123456");

//3.创建执行SL语句的对象,并且执行SQL

//3.1创建执行SQL语句的对象

String sql = "select * from user";

java.sql.Statement stmt = conn.createStatement();

//3.2执行SQL语句

ResultSet resultset = stmt.executeQuery(sql);

while(resultset.next()) {

int uid = resultset.getInt("uid");

String username = resultset.getString("username");

String password = resultset.getString("password");

String name = resultset.getString("name");

System.out.println(uid+"  "+username+"  "+password+"  "+name);

}

//4.释放资源

resultset.close();  //结果集释放

stmt.close();   //

conn.close();   //连接对象释放

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}