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Java > Open Source Codes > examples > ntp > TimeClient


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 JavaDoc;
20 import java.net.InetAddress JavaDoc;
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 JavaDoc host) throws IOException JavaDoc
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 JavaDoc host) throws IOException JavaDoc
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 JavaDoc[] args)
64     {
65
66         if (args.length == 1)
67         {
68             try
69             {
70                 timeTCP(args[0]);
71             }
72             catch (IOException JavaDoc 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 JavaDoc 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
100
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