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Java > Open Source Codes > examples > rdate


1 /*
2  * Copyright 2001-2005 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package examples;
17
18 import java.io.IOException JavaDoc;
19 import java.net.InetAddress JavaDoc;
20 import org.apache.commons.net.TimeTCPClient;
21 import org.apache.commons.net.TimeUDPClient;
22
23 /***
24  * This is an example program demonstrating how to use the TimeTCPClient
25  * and TimeUDPClient classes. It's very similar to the simple Unix rdate
26  * command. This program connects to the default time service port of a
27  * specified server, retrieves the time, and prints it to standard output.
28  * The default is to use the TCP port. Use the -udp flag to use the UDP
29  * port. You can test this program by using the NIST time server at
30  * 132.163.135.130 (warning: the IP address may change).
31  * <p>
32  * Usage: rdate [-udp] <hostname>
33  * <p>
34  * <p>
35  * @author Daniel F. Savarese
36  ***/
37 public final class rdate
38 {
39
40     public static final void timeTCP(String JavaDoc host) throws IOException JavaDoc
41     {
42         TimeTCPClient client = new TimeTCPClient();
43
44         // We want to timeout if a response takes longer than 60 seconds
45 client.setDefaultTimeout(60000);
46         client.connect(host);
47         System.out.println(client.getDate().toString());
48         client.disconnect();
49     }
50
51     public static final void timeUDP(String JavaDoc host) throws IOException JavaDoc
52     {
53         TimeUDPClient client = new TimeUDPClient();
54
55         // We want to timeout if a response takes longer than 60 seconds
56 client.setDefaultTimeout(60000);
57         client.open();
58         System.out.println(client.getDate(InetAddress.getByName(host)).toString());
59         client.close();
60     }
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: rdate [-udp] <hostname>");
93             System.exit(1);
94         }
95
96     }
97
98 }
99
100
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