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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.daytime.DaytimeTCPClient;
24  import org.apache.commons.net.daytime.DaytimeUDPClient;
25  
26  /***
27   * This is an example program demonstrating how to use the DaytimeTCP
28   * and DaytimeUDP classes.
29   * This program connects to the default daytime service port of a
30   * specified server, retrieves the daytime, 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.
33   * <p>
34   * Usage: daytime [-udp] <hostname>
35   * <p>
36   ***/
37  public final class daytime
38  {
39  
40      public static final void daytimeTCP(String host) throws IOException
41      {
42          DaytimeTCPClient client = new DaytimeTCPClient();
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.getTime().trim());
48          client.disconnect();
49      }
50  
51      public static final void daytimeUDP(String host) throws IOException
52      {
53          DaytimeUDPClient client = new DaytimeUDPClient();
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.getTime(
59                                            InetAddress.getByName(host)).trim());
60          client.close();
61      }
62  
63  
64      public static void main(String[] args)
65      {
66  
67          if (args.length == 1)
68          {
69              try
70              {
71                  daytimeTCP(args[0]);
72              }
73              catch (IOException e)
74              {
75                  e.printStackTrace();
76                  System.exit(1);
77              }
78          }
79          else if (args.length == 2 && args[0].equals("-udp"))
80          {
81              try
82              {
83                  daytimeUDP(args[1]);
84              }
85              catch (IOException e)
86              {
87                  e.printStackTrace();
88                  System.exit(1);
89              }
90          }
91          else
92          {
93              System.err.println("Usage: daytime [-udp] <hostname>");
94              System.exit(1);
95          }
96  
97      }
98  
99  }
100