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

try {

BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
String lines = null;

while((lines=bufr.readLine())!=null)
{

byte[] buf=lines.getBytes();
DatagramPacket dp= new DatagramPacket(buf, buf.length,InetAddress.getByName("192.168.5.255"),10001);
ds.send(dp);

if("886".equals(lines))
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();

}
}