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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
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    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import java.io.IOException;
    58  import java.net.InetAddress;
    59  import org.apache.commons.net.DaytimeTCPClient;
    60  import org.apache.commons.net.DaytimeUDPClient;
    61
    62  /****
    63   * This is an example program demonstrating how to use the DaytimeTCP
    64   * and DaytimeUDP classes.
    65   * This program connects to the default daytime service port of a
    66   * specified server, retrieves the daytime, and prints it to standard output.
    67   * The default is to use the TCP port.  Use the -udp flag to use the UDP
    68   * port.
    69   * <p>
    70   * Usage: daytime [-udp] <hostname>
    71   * <p>
    72   ***/
    73  public final class daytime
    74  {
    75
    76      public static final void daytimeTCP(String host) throws IOException
    77      {
    78          DaytimeTCPClient client = new DaytimeTCPClient();
    79
    80          // We want to timeout if a response takes longer than 60 seconds
    81          client.setDefaultTimeout(60000);
    82          client.connect(host);
    83          System.out.println(client.getTime().trim());
    84          client.disconnect();
    85      }
    86
    87      public static final void daytimeUDP(String host) throws IOException
    88      {
    89          DaytimeUDPClient client = new DaytimeUDPClient();
    90
    91          // We want to timeout if a response takes longer than 60 seconds
    92          client.setDefaultTimeout(60000);
    93          client.open();
    94          System.out.println(client.getTime(
    95                                            InetAddress.getByName(host)).trim());
    96          client.close();
    97      }
    98
    99
    100     public static final void main(String[] args)
    101     {
    102
    103         if (args.length == 1)
    104         {
    105             try
    106             {
    107                 daytimeTCP(args[0]);
    108             }
    109             catch (IOException e)
    110             {
    111                 e.printStackTrace();
    112                 System.exit(1);
    113             }
    114         }
    115         else if (args.length == 2 && args[0].equals("-udp"))
    116         {
    117             try
    118             {
    119                 daytimeUDP(args[1]);
    120             }
    121             catch (IOException e)
    122             {
    123                 e.printStackTrace();
    124                 System.exit(1);
    125             }
    126         }
    127         else
    128         {
    129             System.err.println("Usage: daytime [-udp] <hostname>");
    130             System.exit(1);
    131         }
    132
    133     }
    134
    135 }
    136

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