socket问题

[ayiayi6386]

import java.io.*;
import java.net.*;
public class SocketTest
{
public static void main(String args[])
{

try{

Socket socket=new Socket("127.0.0.1",4700);
BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
PrintWriter os=new PrintWriter(socket.getOutputStream());
BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
String readline;
readline=sin.readLine();
while(!readline.equals("bye"))
{
os.println(readline);
os.flush();
System.out.println("Client:"+readline);
System.out.println("Server:"+is.readLine());
readline=sin.readLine();
}
os.close();
is.close();
socket.close();
}
catch(Exception e)
{
System.out.println("Error"+e);
}}}

编译可以通过但不能执行提示为：Errorjava.net.ConnectException: Connection refused: connect
教我

[CoolAbu]

Socket socket=new Socket("127.0.0.1",4700);
这个需要服务器的4700端口是开着的。要么你自己写一个服务器在这个端口监听，要么你把它换成下面的

Socket socket=new Socket("127.0.0.1",80);//如果你本机的80端口也没有开换成别的网站的
Socket socket=new Socket("www.csdn.net",80);