unclient.java

东西比较杂

/**
 * 
 */
package com.tiankong;

/**
 * @author Administrator
 *
 */
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class UnClient extends JFrame implements ActionListener{
	private JTextField enter;
	private JTextArea display;
	private DatagramPacket sendPacket,receivePacket;
	private DatagramSocket socket;
	
	public UnClient(){
		super("UnClient");
		enter=new JTextField("Type message here");
		enter.addActionListener(this);
		getContentPane().add(enter,BorderLayout.NORTH);
		display=new JTextArea();
		getContentPane().add(new JScrollPane(display),BorderLayout.CENTER);
		setSize(400,300);
		setVisible(true);
		try{
			socket=new DatagramSocket();
		}catch(SocketException se){
			se.printStackTrace();
			System.exit(1);
		}
	}
	
	public void waitForPackets(){
		while(true){
			try{
				byte data[]=new byte[100];
				receivePacket=new DatagramPacket(data,data.length);
				
				socket.receive(receivePacket);
				
				display.append("\nPacket received:"+"\nFrom host: "+
						receivePacket.getAddress()+
						"\nHost port: "+receivePacket.getPort()+
						"\nLength: "+receivePacket.getLength()+
						"\nContaining: \n\t"
				+new String(receivePacket.getData(),0,receivePacket.getLength()));
				display.setCaretPosition(display.getText().length());
			}catch(IOException exception){
				display.append(exception.toString()+"\n");
				exception.printStackTrace();
			}
		}
	}
	public void actionPerformed(ActionEvent e){
		try{
			display.append("\nSending packet containing: "+e.getActionCommand()+"\n");
			String s=e.getActionCommand();
			byte data[]=s.getBytes();
			sendPacket=new DatagramPacket(data,data.length,InetAddress.getLocalHost(),5000);
			socket.send(sendPacket);
			display.append("Packet send\n");
			display.setCaretPosition(display.getText().length());
		}catch(IOException exception){
			display.append(exception.toString()+"\n");
			exception.printStackTrace();
		}
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		UnClient app=new UnClient();
		app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		app.waitForPackets();
	}

}