udpclient.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.*;
public class UDPClient {
	public static void main(String args[]) throws IOException {
		   
	      //create dsocket
	      DatagramSocket dsocket = new DatagramSocket();
	      
	      //create datagrampacket for server
	      byte[] b = new byte[100];
	      InetAddress address = InetAddress.getByName("localhost");
	      //InetAddress.getLocalHost();
	      DatagramPacket outpacket = new DatagramPacket(b,5,address,13);
	      //sends data to server
	      dsocket.send(outpacket);
	      //create datagrampacket from Server
	      DatagramPacket inpacket = new DatagramPacket(b,b.length);
	      //waiting for receiving data from server
	      dsocket.receive(inpacket);
	      
	      String strTime = new String(inpacket.getData(),0,inpacket.getLength());
	      System.out.println("server time is : "+strTime+"###");
	      
	      dsocket.close();
	      
	   }
}