1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package examples.unix;
19
20 import java.io.IOException;
21 import java.net.InetAddress;
22
23 import org.apache.commons.net.time.TimeTCPClient;
24 import org.apache.commons.net.time.TimeUDPClient;
25
26 /***
27 * This is an example program demonstrating how to use the TimeTCPClient
28 * and TimeUDPClient classes. It's very similar to the simple Unix rdate
29 * command. This program connects to the default time service port of a
30 * specified server, retrieves the time, and prints it to standard output.
31 * The default is to use the TCP port. Use the -udp flag to use the UDP
32 * port. You can test this program by using the NIST time server at
33 * 132.163.135.130 (warning: the IP address may change).
34 * <p>
35 * Usage: rdate [-udp] <hostname>
36 * <p>
37 * <p>
38 ***/
39 public final class rdate
40 {
41
42 public static final void timeTCP(String host) throws IOException
43 {
44 TimeTCPClient client = new TimeTCPClient();
45
46 // We want to timeout if a response takes longer than 60 seconds
47 client.setDefaultTimeout(60000);
48 client.connect(host);
49 System.out.println(client.getDate().toString());
50 client.disconnect();
51 }
52
53 public static final void timeUDP(String host) throws IOException
54 {
55 TimeUDPClient client = new TimeUDPClient();
56
57 // We want to timeout if a response takes longer than 60 seconds
58 client.setDefaultTimeout(60000);
59 client.open();
60 System.out.println(client.getDate(InetAddress.getByName(host)).toString());
61 client.close();
62 }
63
64
65 public static void main(String[] args)
66 {
67
68 if (args.length == 1)
69 {
70 try
71 {
72 timeTCP(args[0]);
73 }
74 catch (IOException e)
75 {
76 e.printStackTrace();
77 System.exit(1);
78 }
79 }
80 else if (args.length == 2 && args[0].equals("-udp"))
81 {
82 try
83 {
84 timeUDP(args[1]);
85 }
86 catch (IOException e)
87 {
88 e.printStackTrace();
89 System.exit(1);
90 }
91 }
92 else
93 {
94 System.err.println("Usage: rdate [-udp] <hostname>");
95 System.exit(1);
96 }
97
98 }
99
100 }
101