驱动是5.1.40的，MySQL是5.6.33的，数据库开着，能进能修改

package com.kevin.db;

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

public class DBUtil {
    private static final String URL="jdbc:mysql://127.0.0.1:3306/test";
    private static final String USER="root";
    private static final String PASSWORD="root";
	public static void main(String[] args) throws Exception{
		Class.forName("com.mysql.jdbc.Driver");
		Connection conn = DriverManager.getConnection(URL,USER,PASSWORD);
		Statement stmt = conn.createStatement();
		ResultSet rs = stmt.executeQuery("SELECT id,pname FROM provinces");
		while(rs.next()){
			System.out.println(rs.getString("pname")+","+rs.getInt("id"));
		}
	}

}

下面是异常

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)
	at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:632)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1016)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at com.kevin.db.DBUtil.main(DBUtil.java:14)
Caused by: java.net.SocketException: Connection reset
	at java.net.SocketInputStream.read(Unknown Source)
	at java.net.SocketInputStream.read(Unknown Source)
	at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:101)
	at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:144)
	at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:174)
	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3005)
	at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:567)
	... 16 more