java 网络编程，四----UDP进阶篇聊天小程序

设计要求：单线程模式，客户端只发送数据，数据的来源为键盘录入，服务器端只接收数据，当客户端发送886的时候，客户端和服务器端都退出。

1. 发送端：

public class Send implements Runnable{private DatagramSocket ds;public Send(DatagramSocket ds)

{

this.ds= ds;

}

@Override break;

}

ds.close();

} catch (Exception e) {

}

}}

2. 接收端：

public class Reci implements Runnable {

private DatagramSocket ds;

public Reci(DatagramSocket ds)

{

this.ds= ds;

}

@Override

public void run() {

// TODO Auto-generated method stub

try {

while(true){

byte[] buf=new byte[1024];

DatagramPacket dp = new DatagramPacket(buf, buf.length);

ds.receive(dp);

String ipString=dp.getAddress().getHostAddress();

int port =dp.getPort();

String data= new String(dp.getData(),0,dp.getLength());

System.out.println("ip :"+ipString+"port :"+port+"data　:"+data);

if(data.equals("886"))

{

System.out.println(ipString+"...退出聊天室");

}

}

} catch (IOException e) {

}

}

}

3. 单线程进程启动

public class ChatMultiThreadDemo {

public static void main(String[] args) throws SocketException {

DatagramSocket send = new DatagramSocket();

DatagramSocket reci = new DatagramSocket(10001);

new Thread(new Send(send)).start();

new Thread(new Reci(reci)).start();

}

}