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    1   package examples.ntp;
    2
    3   /*
    4    * Copyright 2001-2005 The Apache Software Foundation
    5    *
    6    * Licensed under the Apache License, Version 2.0 (the "License");
    7    * you may not use this file except in compliance with the License.
    8    * You may obtain a copy of the License at
    9    *
    10   *     http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing, software
    13   * distributed under the License is distributed on an "AS IS" BASIS,
    14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15   * See the License for the specific language governing permissions and
    16   * limitations under the License.
    17   */
    18
    19  import java.io.IOException;
    20  import java.net.InetAddress;
    21  import org.apache.commons.net.TimeTCPClient;
    22  import org.apache.commons.net.TimeUDPClient;
    23
    24  /****
    25   * This is an example program demonstrating how to use the TimeTCPClient
    26   * and TimeUDPClient classes.
    27   * This program connects to the default time service port of a
    28   * specified server, retrieves the time, and prints it to standard output.
    29   * See <A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc868.txt"> the spec </A>
    30   * for details.  The default is to use the TCP port.  Use the -udp flag to
    31   * use the UDP port.
    32   * <p>
    33   * Usage: TimeClient [-udp] <hostname>
    34   * <p>
    35   ***/
    36  public final class TimeClient
    37  {
    38
    39      public static final void timeTCP(String host) throws IOException
    40      {
    41          TimeTCPClient client = new TimeTCPClient();
    42  	try {
    43            // We want to timeout if a response takes longer than 60 seconds
    44            client.setDefaultTimeout(60000);
    45  	  client.connect(host);
    46            System.out.println(client.getDate());
    47  	} finally {
    48            client.disconnect();
    49  	}
    50      }
    51
    52      public static final void timeUDP(String host) throws IOException
    53      {
    54          TimeUDPClient client = new TimeUDPClient();
    55
    56          // We want to timeout if a response takes longer than 60 seconds
    57          client.setDefaultTimeout(60000);
    58          client.open();
    59          System.out.println(client.getDate(InetAddress.getByName(host)));
    60          client.close();
    61      }
    62
    63      public static final void main(String[] args)
    64      {
    65
    66          if (args.length == 1)
    67          {
    68              try
    69              {
    70                  timeTCP(args[0]);
    71              }
    72              catch (IOException e)
    73              {
    74                  e.printStackTrace();
    75                  System.exit(1);
    76              }
    77          }
    78          else if (args.length == 2 && args[0].equals("-udp"))
    79          {
    80              try
    81              {
    82                  timeUDP(args[1]);
    83              }
    84              catch (IOException e)
    85              {
    86                  e.printStackTrace();
    87                  System.exit(1);
    88              }
    89          }
    90          else
    91          {
    92              System.err.println("Usage: TimeClient [-udp] <hostname>");
    93              System.exit(1);
    94          }
    95
    96      }
    97
    98  }
    99