juechoserver.java

java中线程的应用,你学会了吗,这里是一个例子可供你参考使用。

import java.net.*;
import java.io.*;
public class JUEchoserver implements Runnable
{private int port;
 private DatagramSocket dsocket;
 public JUEchoserver () throws SocketException
 {this(100);} 
 
 public JUEchoserver (int port) throws SocketException
	{this.port=port;
     this.dsocket=new DatagramSocket(this.port);
     }
 public void run()
	{byte[] buffer=new byte[1024];
	 while (true)
	 {DatagramPacket incomming=new DatagramPacket(buffer,buffer.length);
	  try
	  {
	  	dsocket.receive(incomming);
		DatagramPacket outgoing=new DatagramPacket(incomming.getData(),incomming.getLength(),incomming.getAddress(),incomming.getPort());
		dsocket.send(outgoing);
	  }
	  catch (IOException e)
	  {
	  }
	 }
	 }
	 public static void main(String args[])
	{try
	{
		JUEchoserver server=null;
		if(args.length==0)
			server=new JUEchoserver();
		else if (args.length==1)
		{server =new JUEchoserver(Integer.parseInt(args[0]));
		 }
		 else
		{System.out.println("usage:java JUEchoserver port");
		 return;
		 }
		 (new Thread(server)).start();
	}
	catch (Exception e)
	{e.printStackTrace();
	}
	  }
 }