www.pudn.com > jnp-src.rar > DaytimeClient.java

/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*; 
import java.net.*; 
 
public class DaytimeClient { 
  public static void main (String[] args) throws IOException { 
    if ((args.length != 1)) 
      throw new IllegalArgumentException 
        ("Syntax: DaytimeClient [:]"); 
  
    int idx = args[0].indexOf (":"); 
    int port = (idx > -1) ? Integer.parseInt (args[0].substring (idx + 1)) 
      : DaytimeServer.DEFAULT_PORT; 
    String hostName = (idx > -1) ? args[0].substring (0, idx) : args[0]; 
    InetAddress host = InetAddress.getByName (hostName); 
  
    DatagramSocket socket = new DatagramSocket (); 
    socket.setSoTimeout (5000); 
    DatagramPacket packet = new DatagramPacket (new byte[256], 1, host, port); 
    socket.send (packet); 
    packet.setLength (packet.getData ().length); 
    socket.receive (packet); 
    socket.close (); 
  
    byte[] data = packet.getData (); 
    int length = packet.getLength (); 
    System.out.println (new String (data, 0, length, "latin1")); 
  } 
}