Commons Net example source code file (MessageThreading.java)

This example Commons Net source code file (MessageThreading.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Net tags/keywords

article, io, iterable, messagethreading, net, network, newsgroupinfo, newsgroupinfo, nntpclient, nntpclient, optional, printcommandlistener, socketexception, string, string, threader, threader

The Commons Net MessageThreading.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package examples.nntp;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.SocketException;
import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;
import org.apache.commons.net.nntp.Threader;


public class MessageThreading {
    public MessageThreading() {
    }

    public static void main(String[] args) throws SocketException, IOException {

        if (args.length != 2 && args.length != 4) {
            System.out.println("Usage: MessageThreading <hostname>  [ ]");
            return;
        }

        String hostname = args[0];
        String newsgroup = args[1];

        NNTPClient client = new NNTPClient();
        client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
        client.connect(hostname);

        if (args.length == 4) { // Optional auth
            String user = args[2];
            String password = args[3];
            if(!client.authenticate(user, password)) {
                System.out.println("Authentication failed for user " + user + "!");
                System.exit(1);
            }
        }

        String fmt[] = client.listOverviewFmt();
        if (fmt != null) {
            System.out.println("LIST OVERVIEW.FMT:");
            for(String s : fmt) {
                System.out.println(s);
            }
        } else {
            System.out.println("Failed to get OVERVIEW.FMT");
        }
        NewsgroupInfo group = new NewsgroupInfo();
        client.selectNewsgroup(newsgroup, group);

        long lowArticleNumber = group.getFirstArticleLong();
        long highArticleNumber = lowArticleNumber + 5000;

        System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
        Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);

        System.out.println("Building message thread tree...");
        Threader threader = new Threader();
        Article root = (Article)threader.thread(articles);

        Article.printThread(root, 0);
    }

}