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 org.apache.commons.net.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 */
37 public final class rdate
38 {
39
40 public static void timeTCP(final String host) throws IOException
41 {
42 final TimeTCPClientimeTCPClient.html#TimeTCPClient">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 void timeUDP(final String host) throws IOException
52 {
53 final TimeUDPClientimeUDPClient.html#TimeUDPClient">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 void main(final String[] args)
64 {
65
66 if (args.length == 1)
67 {
68 try
69 {
70 timeTCP(args[0]);
71 }
72 catch (final IOException 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 (final IOException 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