daytimeclient.java

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/*
 * 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 <host>[:<port>]");
 
    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"));
  }
}