ChatClient.java

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

public class ChatClient extends Frame {
 Socket s = null;
 DataOutputStream dos =null;

 TextField tfTxt = new TextField();

 TextArea taContent = new TextArea();

 public static void main(String[] args) {
  new ChatClient().launchFrame();
 }

 public void launchFrame() {
  setLocation(400, 300);
  this.setSize(300, 300);
  add(tfTxt, BorderLayout.SOUTH);
  add(taContent, BorderLayout.NORTH);
  pack();
  this.addWindowListener(new WindowAdapter() {

   @Override
   public void windowClosing(WindowEvent arg0) {
    disconnect();
    System.exit(0);
   }
   
  });
  tfTxt.addActionListener(new TFListener());
  setVisible(true);
  connect();
 }
 
 public void connect() {
  try {
   s = new Socket("127.0.0.1", 8888);
   dos=new DataOutputStream(s.getOutputStream());
System.out.println("connected!");
  } catch (UnknownHostException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  
 }
 public void disconnect(){
  
  try {
   dos.close();
   s.close();
  } catch (IOException e) {   
   e.printStackTrace();
  }
  
  
  
 }
 
 private class TFListener implements ActionListener {

  public void actionPerformed(ActionEvent e) {
   String str = tfTxt.getText().trim();
   taContent.setText(str);
   tfTxt.setText("");
   
   try {
//System.out.println(s);
    
    dos.writeUTF(str);
    dos.flush();
    //dos.close();
   } catch (IOException e1) {
    e1.printStackTrace();
   }
   
  }
  
 }

}