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;
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 * @author Daniel F. Savarese
39 ***/
40 public final class rdate
41 {
42
43 public static final void timeTCP(String host) throws IOException
44 {
45 TimeTCPClient client = new TimeTCPClient();
46
47 // We want to timeout if a response takes longer than 60 seconds
48 client.setDefaultTimeout(60000);
49 client.connect(host);
50 System.out.println(client.getDate().toString());
51 client.disconnect();
52 }
53
54 public static final void timeUDP(String host) throws IOException
55 {
56 TimeUDPClient client = new TimeUDPClient();
57
58 // We want to timeout if a response takes longer than 60 seconds
59 client.setDefaultTimeout(60000);
60 client.open();
61 System.out.println(client.getDate(InetAddress.getByName(host)).toString());
62 client.close();
63 }
64
65
66 public static final void main(String[] args)
67 {
68
69 if (args.length == 1)
70 {
71 try
72 {
73 timeTCP(args[0]);
74 }
75 catch (IOException e)
76 {
77 e.printStackTrace();
78 System.exit(1);
79 }
80 }
81 else if (args.length == 2 && args[0].equals("-udp"))
82 {
83 try
84 {
85 timeUDP(args[1]);
86 }
87 catch (IOException e)
88 {
89 e.printStackTrace();
90 System.exit(1);
91 }
92 }
93 else
94 {
95 System.err.println("Usage: rdate [-udp] <hostname>");
96 System.exit(1);
97 }
98
99 }
100
101 }
102