TanSanC

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

import java.util.Scanner;

class RecvThread extends Thread {

     Socket s;

     public RecvThread(Socket s) {

          this.s = s;

     }

     @Override

     public void run() {

          // 받는 부분

          BufferedReader is;

          try {

              is = new BufferedReader(new InputStreamReader(s.getInputStream()));

              String recvMsg;

              while ((recvMsg = is.readLine()) != null) {

                   System.out.println(recvMsg);

              }

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}

class SendThread extends Thread {

     Socket s;

     public SendThread(Socket s) {

          this.s = s;

     }

     @Override

     public void run() {

          PrintWriter os;

          try {

              os = new PrintWriter(s.getOutputStream(), true);

              // 보내는 부분

              Scanner sc = new Scanner(System.in);

              while (true) {

                   String msg = sc.next();

                   os.println(msg);

              }

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}

public class ClientTest {

     public static void main(String[] args) {

          try {

              Socket s = new Socket("115.20.247.142", 4000);

              SendThread st = new SendThread(s);

              RecvThread rt = new RecvThread(s);

          } catch (UnknownHostException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}