udpserver.txt

利用UDP进行网络编程,并能读取服务器的时间.

import java.net.*;
import java.io.*;
import java.util.Date;
public class UDPServer {
	public static void main(String args[]) throws Exception  {
	      
	      //create dsocket
	      DatagramSocket dsocket = new DatagramSocket(13);
	      
	      //create datagrampacket from client
	      byte[] msg = new byte[10] ;
	      DatagramPacket inpacket = new DatagramPacket(msg,1);
	      
	      //waiting for receiving data from client
	      dsocket.receive(inpacket) ;
	      
	      //get address,port from DatagramPacket
	      InetAddress clientAddress = inpacket.getAddress();
	      int clientPort = inpacket.getPort();
	      
	      //create datagrampacket for client
	      msg = new Date().toString().getBytes();
	      DatagramPacket outpacket = new DatagramPacket(msg,msg.length,clientAddress,clientPort);
	      
	      //sends data to client
	      dsocket.send(outpacket);
	      
	      //close resource opened.
	      dsocket.close();
	   
	   }
}