quoteclient.java

电子工业出版社出版的《java2应用开发指南》配套光盘源代码

//【代码18-2-2】
// QuoteClient.java
import java.io.*;
import java.net.*;
import java.util.*;

public class QuoteClient 
{
    public static void main(String[] args) throws IOException 
{

        if (args.length != 1) 
{
             System.out.println("Usage: java QuoteClient <hostname>");
             return;
        }

	    // get a datagram socket
        DatagramSocket socket = new DatagramSocket();

	   // send request
	   byte[] buf = new byte[256];
	   InetAddress address = InetAddress.getByName(args[0]);
	   DatagramPacket packet = 
new DatagramPacket(buf, buf.length, address, 1800);
	   socket.send(packet);

	   // get response
	   packet = new DatagramPacket(buf, buf.length);
	   socket.receive(packet);

	   // display response
	   String received = new String(packet.getData(), 0);
	   System.out.println("Quote of the Moment: " + received);

	   socket.close();
    }
}