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
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
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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