1 package examples;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Commons" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
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32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.io.IOException;
58 import org.apache.commons.net.nntp.NNTPClient;
59 import org.apache.commons.net.nntp.NewsgroupInfo;
60
61 /****
62 * This is a trivial example using the NNTP package to approximate the
63 * Unix newsgroups command. It merely connects to the specified news
64 * server and issues fetches the list of newsgroups stored by the server.
65 * On servers that store a lot of newsgroups, this command can take a very
66 * long time (listing upwards of 30,000 groups).
67 * <p>
68 ***/
69
70 public final class newsgroups
71 {
72
73 public final static void main(String[] args)
74 {
75 NNTPClient client;
76 NewsgroupInfo[] list;
77
78 if (args.length < 1)
79 {
80 System.err.println("Usage: newsgroups newsserver");
81 System.exit(1);
82 }
83
84 client = new NNTPClient();
85
86 try
87 {
88 client.connect(args[0]);
89
90 list = client.listNewsgroups();
91
92 if (list != null)
93 {
94 for (int i = 0; i < list.length; i++)
95 System.out.println(list[i].getNewsgroup());
96 }
97 else
98 {
99 System.err.println("LIST command failed.");
100 System.err.println("Server reply: " + client.getReplyString());
101 }
102 }
103 catch (IOException e)
104 {
105 e.printStackTrace();
106 }
107 finally
108 {
109 try
110 {
111 if (client.isConnected())
112 client.disconnect();
113 }
114 catch (IOException e)
115 {
116 System.err.println("Error disconnecting from server.");
117 e.printStackTrace();
118 System.exit(1);
119 }
120 }
121
122 }
123
124 }
125
126
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