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Java > Open Source Codes > examples > nntp > newsgroups


1 /*
2  * Copyright 2001-2005 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package examples.nntp;
17
18 import java.io.IOException JavaDoc;
19 import org.apache.commons.net.nntp.NNTPClient;
20 import org.apache.commons.net.nntp.NewsgroupInfo;
21
22 /***
23  * This is a trivial example using the NNTP package to approximate the
24  * Unix newsgroups command. It merely connects to the specified news
25  * server and issues fetches the list of newsgroups stored by the server.
26  * On servers that store a lot of newsgroups, this command can take a very
27  * long time (listing upwards of 30,000 groups).
28  * <p>
29  ***/
30
31 public final class newsgroups
32 {
33
34     public final static void main(String JavaDoc[] args)
35     {
36         NNTPClient client;
37         NewsgroupInfo[] list;
38
39         if (args.length < 1)
40         {
41             System.err.println("Usage: newsgroups newsserver");
42             System.exit(1);
43         }
44
45         client = new NNTPClient();
46
47         try
48         {
49             client.connect(args[0]);
50
51             list = client.listNewsgroups();
52
53             if (list != null)
54             {
55                 for (int i = 0; i < list.length; i++)
56                     System.out.println(list[i].getNewsgroup());
57             }
58             else
59             {
60                 System.err.println("LIST command failed.");
61                 System.err.println("Server reply: " + client.getReplyString());
62             }
63         }
64         catch (IOException JavaDoc e)
65         {
66             e.printStackTrace();
67         }
68         finally
69         {
70             try
71             {
72                 if (client.isConnected())
73                     client.disconnect();
74             }
75             catch (IOException JavaDoc e)
76             {
77                 System.err.println("Error disconnecting from server.");
78                 e.printStackTrace();
79                 System.exit(1);
80             }
81         }
82
83     }
84
85 }
86
87
88
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