unserver.java

东西比较杂

/**
 * 
 */
package com.tiankong;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
 * @author Administrator
 *
 */
public class UnServer extends JFrame {
	private JTextArea display;
	private DatagramPacket sendPacket,receivePacket;
	private DatagramSocket socket;
	
	public UnServer(){
		super("UnServer");
		display=new JTextArea();
		getContentPane().add(new JScrollPane(display),BorderLayout.CENTER);
		setSize(400,300);
		setVisible(true);
		try{
			socket=new DatagramSocket(5000);
		}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.append("\n\nEcho data to client...");
				sendPacket=new DatagramPacket(receivePacket.getData()
						,receivePacket.getLength(),receivePacket.getAddress()
						,receivePacket.getPort());
				socket.send(sendPacket);
				display.append("Packet send\n");
				display.setCaretPosition(display.getText().length());
			}catch(IOException io){
				display.append(io.toString()+"\n");
				io.printStackTrace();
			}
		}
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		UnServer app=new UnServer();
		app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		app.waitForPackets();
	}

}