UDP-聊天

/*
编写一个聊天程序。
有收数据的部分，和发数据的部分
这两部分需要同时执行
那就需要用到多线程技术
一个线程控制收，一个线程控制发。


因为收和发动作是不一致的，所以要定义两个run方法。
而且这两个方法要封装到不同的类中
*/
import java.io.*;
import java.net.*;


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( "886".equals(line) )
break;


byte[] buf = line.getBytes();


DatagramPacket dp = 
new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.255"),10002);

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
{
//循环接收
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("接收端失败");
}
}
}




class ChatDemo
{
public static void main(String[] args) throws Exception
{
DatagramSocket sendSocket = new DatagramSocket();
DatagramSocket receSocket = new DatagramSocket(10002);


new Thread(new Send(sendSocket)).start();
new Thread(new Rece(receSocket)).start();
}
}