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.nntp;
19
20 import java.io.IOException;
21 import org.apache.commons.net.nntp.NNTPClient;
22 import org.apache.commons.net.nntp.NewsgroupInfo;
23
24 /***
25 * This is a trivial example using the NNTP package to approximate the
26 * Unix newsgroups command. It merely connects to the specified news
27 * server and issues fetches the list of newsgroups stored by the server.
28 * On servers that store a lot of newsgroups, this command can take a very
29 * long time (listing upwards of 30,000 groups).
30 * <p>
31 ***/
32
33 public final class newsgroups
34 {
35
36 public final static void main(String[] args)
37 {
38 NNTPClient client;
39 NewsgroupInfo[] list;
40
41 if (args.length < 1)
42 {
43 System.err.println("Usage: newsgroups newsserver");
44 System.exit(1);
45 }
46
47 client = new NNTPClient();
48
49 try
50 {
51 client.connect(args[0]);
52
53 list = client.listNewsgroups();
54
55 if (list != null)
56 {
57 for (int i = 0; i < list.length; i++)
58 System.out.println(list[i].getNewsgroup());
59 }
60 else
61 {
62 System.err.println("LIST command failed.");
63 System.err.println("Server reply: " + client.getReplyString());
64 }
65 }
66 catch (IOException e)
67 {
68 e.printStackTrace();
69 }
70 finally
71 {
72 try
73 {
74 if (client.isConnected())
75 client.disconnect();
76 }
77 catch (IOException e)
78 {
79 System.err.println("Error disconnecting from server.");
80 e.printStackTrace();
81 System.exit(1);
82 }
83 }
84
85 }
86
87 }
88
89