关于UDP聊天 - 黑马程序员技术交流社区

/*
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.net.*;
import java.io.*;
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<FONT color=red>("127.0.0.255"),</FONT>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
{
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("发送端失败");
}
}
}
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();
}
}

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