DatagramSocket和DatagramPacket的使用

/**   
* @Title: SocketDemo.java
* @Package net
* @Description:
* @author huangjie
* @email [email protected]
* @date May 7, 2012 6:35:46 PM
* @version V1.0   
*/
package net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class SocketDemo {
public static void main(String[] args) throws SocketException {
	DatagramSocket ds1=new DatagramSocket();
	DatagramSocket ds2=new DatagramSocket(10000);	
	new Thread(new Send(ds1)).start();
	new Thread(new Receive(ds2)).start();
	
}
}
class Send implements Runnable{
	DatagramSocket ds=null;
	public Send(DatagramSocket ds){
		this.ds=ds;
	}
	public void run() {
		// TODO Auto-generated method stub
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String line=null;
		try{
			while((line=br.readLine())!=null){
				byte[] buf=line.getBytes();
				DatagramPacket dp=new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.255"),10000);
				ds.send(dp);
			}
		}catch(IOException e){
			e.printStackTrace();
		}finally{
			ds.close();
		}
	}
}
class Receive implements Runnable{
	DatagramSocket ds=null;
	public Receive(DatagramSocket ds){
		this.ds=ds;
	}
	public void run(){
		try{
			byte[] buf=new byte[1024];
			DatagramPacket dp=new DatagramPacket(buf,0,buf.length);
			while(true){
				ds.receive(dp);
				String data=new String(dp.getData(),0,dp.getLength());
				System.out.println(data+":"+dp.getAddress().getHostAddress());
			}
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			ds.close();
		}
	}
}