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 import java.time.Duration;
23
24 import org.apache.commons.net.daytime.DaytimeTCPClient;
25 import org.apache.commons.net.daytime.DaytimeUDPClient;
26
27 /**
28 * This is an example program demonstrating how to use the DaytimeTCP and DaytimeUDP classes. This program connects to the default daytime service port of a
29 * specified server, retrieves the daytime, and prints it to standard output. The default is to use the TCP port. Use the -udp flag to use the UDP port.
30 * <p>
31 * Usage: daytime [-udp] <hostname>
32 */
33 public final class daytime {
34
35 public static void daytimeTCP(final String host) throws IOException {
36 final DaytimeTCPClient client = new DaytimeTCPClient();
37
38 // We want to timeout if a response takes longer than 60 seconds
39 client.setDefaultTimeout(60000);
40 client.connect(host);
41 System.out.println(client.getTime().trim());
42 client.disconnect();
43 }
44
45 public static void daytimeUDP(final String host) throws IOException {
46 try (DaytimeUDPClient client = new DaytimeUDPClient()) {
47
48 // We want to timeout if a response takes longer than 60 seconds
49 client.setDefaultTimeout(Duration.ofSeconds(60));
50 client.open();
51 System.out.println(client.getTime(InetAddress.getByName(host)).trim());
52 }
53 }
54
55 public static void main(final String[] args) {
56
57 if (args.length == 1) {
58 try {
59 daytimeTCP(args[0]);
60 } catch (final IOException e) {
61 e.printStackTrace();
62 System.exit(1);
63 }
64 } else if (args.length == 2 && args[0].equals("-udp")) {
65 try {
66 daytimeUDP(args[1]);
67 } catch (final IOException e) {
68 e.printStackTrace();
69 System.exit(1);
70 }
71 } else {
72 System.err.println("Usage: daytime [-udp] <hostname>");
73 System.exit(1);
74 }
75
76 }
77
78 }