网络编程-UDP程序聊天小程序

package com.yyq;

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

/*
 * 编写一个聊天程序。有收数据的部分，有发送数据的部分，这两部分需要同时执行
 * 那就需要用到多线程技术。一个线程收，一个线程发。
 * 因为收和发动作是不一致的，所以
 */
class Send implements Runnable{
    private DatagramSocket ds;
    public Send(DatagramSocket ds){
        this.ds = ds;
    }
    public void run(){
        try{
            BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
            String line = null;
            while((line = bufr.readLine())!=null){
                if("88".equals(line)){
                    break;
                }
                else{
                    byte[] buf = new byte[1024];
                    DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getLocalHost(),1237);
                    ds.send(dp);
                }
            }
        }
        catch(Exception e){
            throw new RuntimeException("发送端失败！！");
        }
    }
}
class Rece implements Runnable{
    private DatagramSocket ds;
    public  Rece(DatagramSocket ds){
        this.ds = ds;
    }
    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();
                String data = new String(dp.getData(),0,dp.getLength());
                System.out.println(ip+data);
            }
        }
        catch(Exception e){
            throw new RuntimeException("接受端失败！！");
        }
    }
}
public class ChatDemo {
    public static void main(String[] args) throws SocketException {
        DatagramSocket sendSocket = new DatagramSocket();
        DatagramSocket receSocket = new DatagramSocket(1237);
        new Thread(new Rece(sendSocket)).start();
        new Thread(new Send(sendSocket)).start();
    }
}