import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.lang.*;

public class client extends Frame implements ActionListener {

private Frame f;
private Label sip, ip, wr;
private TextField wrt;
private List talk;
String word;

public client()
{
  
  f = new Frame("간단한 메신저");
  f.setBackground(Color.blue);
  sip = new Label("보낼곳(IP주소)", Label.CENTER);
  sip.setBackground(Color.green);
  ip = new Label("127.0.0.1");
  ip.setBackground(Color.yellow);
  wr = new Label("입력내용", Label.CENTER);
  wr.setBackground(Color.yellow);
  wrt = new TextField();
  talk = new List(10, false);
}

public void start()
{
  f.setLayout(null);
  
  f.add(sip);
  f.add(ip);
  f.add(wr);
  f.add(wrt);
  f.add(talk);
  
  
  f.setBounds(300, 200, 300, 350);
  sip.setBounds(10, 40, 120, 20);
  ip.setBounds(150, 40, 120, 20);
  wr.setBounds(10, 300, 120, 20);
  wrt.setBounds(150, 300, 120, 20);
  talk.setBounds(10, 90, 310, 180);
  
  
  f.setVisible(true);
  f.addWindowListener(new MyWinListener());
  wrt.addActionListener(this);
}

public static void main(String[] args)
{
  client kkk = new client();
  kkk.start();
  
  }


public void actionPerformed(ActionEvent e)
{
  if(e.getSource() == wrt)
  {
   byte[] word2 = new byte[100];
   word = wrt.getText();
   try
   {
     DatagramSocket ds1 = new DatagramSocket(5000);
     InetAddress ia1 = InetAddress.getByName("localhost");
     word2 = word.getBytes();
     DatagramPacket dp1 = new DatagramPacket(word2, word2.length, ia1, 5000);
    
     ds1.send(dp1);
     talk.add("보내는 메시지 >>" +word);
     wrt.setText("");
     wrt.requestFocus();
    
    
   }
   catch(Exception ea)
   {
        System.out.println(ea);
   }
  
   try
   {
    DatagramSocket ds2 = new DatagramSocket(3000);
       byte[] word3 = new byte[100];
    DatagramPacket dp2 = new DatagramPacket(word3, word3.length);
    
    ds2.receive(dp2);    
    String rs1 = new String(dp2.getData());
    String rs2 = new String(rs1.trim());
    talk.add("받은 메시지 >>" + rs2);
   }
   catch(Exception eaw)
   {
        System.out.println(eaw);
   }
  }
}
  
class MyWinListener extends WindowAdapter
{
  public void windowClosing(WindowEvent e)
  {
   System.exit(0);
  }
}
}

클라이언트 모양새는 갖춰졌고 메시지는 써지는데
메시지가 한번 밖에는 안들어가네요. 두번째 부터 그냥 무응답입니다.
어딜 수정해야 할까요???