udp群聊

package cn.charp3;

import java.net.DatagramSocket;
import java.net.SocketException;

public class charDemo {

    public static void main(String[] args) throws Exception {
        DatagramSocket send=new DatagramSocket();
        DatagramSocket rece=new DatagramSocket(10001);    
        new Thread(new Send(send)).start();
        new Thread(new Rece(rece)).start();
        

    }

}
package cn.charp3;

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

public class Send implements Runnable {
    private DatagramSocket ds;
    public Send(DatagramSocket ds)
    {
        this.ds=ds;
    }
    @Override
    public void run() {
        try {
            
            BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));
            String line=null;
            while((line=bufr.readLine())!=null)
            {
                byte[] buf=line.getBytes();
                DatagramPacket dp=new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.0.255"), 10001);
                ds.send(dp);
            }                
        } catch (Exception e) {
            // TODO: handle exception
        }

    }    
}
package cn.charp3;

import java.net.DatagramPacket;
import java.net.DatagramSocket;


public class Rece implements Runnable {
    private DatagramSocket ds;
    public Rece(DatagramSocket ds)
    {
        this.ds=ds;
    }
    @Override
    public void run() {
        
        try{
        while(true)
        {
            byte[] buf=new byte[1024];
            DatagramPacket dp=new DatagramPacket(buf,buf.length);
            ds.receive(dp);
            String ip=dp.getAddress().getHostAddress();
            int port=dp.getPort();
            String text=new String(dp.getData(),0,dp.getLength());
            System.out.println(ip+""+port+""+text);
            if(text.equals("886")){
                System.out.println(ip+"退出了");
            }
        }
        }catch(Exception e)
        {
            
        }
    }

}