1 package examples.ntp;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20
21 import java.io.IOException;
22 import java.net.InetAddress;
23
24 import org.apache.commons.net.time.TimeTCPClient;
25 import org.apache.commons.net.time.TimeUDPClient;
26
27 /***
28 * This is an example program demonstrating how to use the TimeTCPClient
29 * and TimeUDPClient classes.
30 * This program connects to the default time service port of a
31 * specified server, retrieves the time, and prints it to standard output.
32 * See <A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc868.txt"> the spec </A>
33 * for details. The default is to use the TCP port. Use the -udp flag to
34 * use the UDP port.
35 * <p>
36 * Usage: TimeClient [-udp] <hostname>
37 * <p>
38 ***/
39 public final class TimeClient
40 {
41
42 public static final void timeTCP(String host) throws IOException
43 {
44 TimeTCPClient client = new TimeTCPClient();
45 try {
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());
50 } finally {
51 client.disconnect();
52 }
53 }
54
55 public static final void timeUDP(String host) throws IOException
56 {
57 TimeUDPClient client = new TimeUDPClient();
58
59 // We want to timeout if a response takes longer than 60 seconds
60 client.setDefaultTimeout(60000);
61 client.open();
62 System.out.println(client.getDate(InetAddress.getByName(host)));
63 client.close();
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: TimeClient [-udp] <hostname>");
96 System.exit(1);
97 }
98
99 }
100
101 }
102