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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
    29   *    "Apache Commons" must not be used to endorse or promote products
    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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    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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    49   * ====================================================================
    50   *
    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.TimeTCPClient;
    60  import org.apache.commons.net.TimeUDPClient;
    61
    62  /****
    63   * This is an example program demonstrating how to use the TimeTCPClient
    64   * and TimeUDPClient classes.  It's very similar to the simple Unix rdate
    65   * command.  This program connects to the default time service port of a
    66   * specified server, retrieves the time, 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.  You can test this program by using the NIST time server at
    69   * 132.163.135.130 (warning: the IP address may change).
    70   * <p>
    71   * Usage: rdate [-udp] <hostname>
    72   * <p>
    73   * <p>
    74   * @author Daniel F. Savarese
    75   ***/
    76  public final class rdate
    77  {
    78
    79      public static final void timeTCP(String host) throws IOException
    80      {
    81          TimeTCPClient client = new TimeTCPClient();
    82
    83          // We want to timeout if a response takes longer than 60 seconds
    84          client.setDefaultTimeout(60000);
    85          client.connect(host);
    86          System.out.println(client.getDate().toString());
    87          client.disconnect();
    88      }
    89
    90      public static final void timeUDP(String host) throws IOException
    91      {
    92          TimeUDPClient client = new TimeUDPClient();
    93
    94          // We want to timeout if a response takes longer than 60 seconds
    95          client.setDefaultTimeout(60000);
    96          client.open();
    97          System.out.println(client.getDate(InetAddress.getByName(host)).toString());
    98          client.close();
    99      }
    100
    101
    102     public static final void main(String[] args)
    103     {
    104
    105         if (args.length == 1)
    106         {
    107             try
    108             {
    109                 timeTCP(args[0]);
    110             }
    111             catch (IOException e)
    112             {
    113                 e.printStackTrace();
    114                 System.exit(1);
    115             }
    116         }
    117         else if (args.length == 2 && args[0].equals("-udp"))
    118         {
    119             try
    120             {
    121                 timeUDP(args[1]);
    122             }
    123             catch (IOException e)
    124             {
    125                 e.printStackTrace();
    126                 System.exit(1);
    127             }
    128         }
    129         else
    130         {
    131             System.err.println("Usage: rdate [-udp] <hostname>");
    132             System.exit(1);
    133         }
    134
    135     }
    136
    137 }
    138

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