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Java > Open Source Codes > examples > nntp > MessageThreading


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
17 package examples.nntp;
18
19 import java.io.IOException JavaDoc;
20 import java.io.PrintWriter JavaDoc;
21 import java.net.SocketException JavaDoc;
22
23 import org.apache.commons.net.nntp.Article;
24 import org.apache.commons.net.nntp.NNTPClient;
25 import org.apache.commons.net.nntp.NewsgroupInfo;
26 import org.apache.commons.net.nntp.Threader;
27
28 import examples.PrintCommandListener;
29
30 public class MessageThreading {
31     public MessageThreading() {
32     }
33     
34     public static void main(String JavaDoc[] args) throws SocketException JavaDoc, IOException JavaDoc {
35         
36         if (args.length != 3)
37             usage();
38         
39         String JavaDoc hostname = args[0];
40         String JavaDoc user = args[1];
41         String JavaDoc password = args[2];
42         
43         NNTPClient client = new NNTPClient();
44         client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter JavaDoc(System.out)));
45         client.connect(hostname);
46         
47         if(!client.authenticate(user, password)) {
48             System.out.println("Authentication failed for user " + user + "!");
49             System.exit(1);
50         }
51         
52         NewsgroupInfo group = new NewsgroupInfo();
53         client.selectNewsgroup("comp.lang.lisp", group);
54         
55         int lowArticleNumber = group.getFirstArticle();
56         int highArticleNumber = lowArticleNumber + 100;
57         
58         System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
59         Article[] articles = NNTPUtils.getArticleInfo(client, lowArticleNumber, highArticleNumber);
60         
61         System.out.println("Building message thread tree...");
62         Threader threader = new Threader();
63         Article root = (Article)threader.thread(articles);
64         
65         Article.printThread(root, 0);
66         
67     }
68     
69     
70     public static void usage() {
71         System.out.println("Usage: MessageThreading <hostname> <user> <password>");
72         System.exit(0);
73     }
74 }
75
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