Commons Net example source code file (PostMessage.java)

This example Commons Net source code file (PostMessage.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

bufferedreader, bufferedreader, filename, filereader, filereader, io, newsgroup, newsgroup, nntpclient, organization, references, simplenntpheader, string, string, subject

The Commons Net PostMessage.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.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.Writer;

import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.io.Util;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NNTPReply;
import org.apache.commons.net.nntp.SimpleNNTPHeader;


/***
 * This is an example program using the NNTP package to post an article
 * to the specified newsgroup(s).  It prompts you for header information and
 * a filename to post.
 * <p>
 ***/

public final class PostMessage
{

    public final static void main(String[] args)
    {
        String from, subject, newsgroup, filename, server, organization;
        String references;
        BufferedReader stdin;
        FileReader fileReader = null;
        SimpleNNTPHeader header;
        NNTPClient client;

        if (args.length < 1)
        {
            System.err.println("Usage: post newsserver");
            System.exit(1);
        }

        server = args[0];

        stdin = new BufferedReader(new InputStreamReader(System.in));

        try
        {
            System.out.print("From: ");
            System.out.flush();

            from = stdin.readLine();

            System.out.print("Subject: ");
            System.out.flush();

            subject = stdin.readLine();

            header = new SimpleNNTPHeader(from, subject);

            System.out.print("Newsgroup: ");
            System.out.flush();

            newsgroup = stdin.readLine();
            header.addNewsgroup(newsgroup);

            while (true)
            {
                System.out.print("Additional Newsgroup <Hit enter to end>: ");
                System.out.flush();

                // Of course you don't want to do this because readLine() may be null
                newsgroup = stdin.readLine().trim();

                if (newsgroup.length() == 0)
                    break;

                header.addNewsgroup(newsgroup);
            }

            System.out.print("Organization: ");
            System.out.flush();

            organization = stdin.readLine();

            System.out.print("References: ");
            System.out.flush();

            references = stdin.readLine();

            if (organization != null && organization.length() > 0)
                header.addHeaderField("Organization", organization);

            if (references != null && references.length() > 0)
                header.addHeaderField("References", references);

            header.addHeaderField("X-Newsreader", "NetComponents");

            System.out.print("Filename: ");
            System.out.flush();

            filename = stdin.readLine();

            try
            {
                fileReader = new FileReader(filename);
            }
            catch (FileNotFoundException e)
            {
                System.err.println("File not found. " + e.getMessage());
                System.exit(1);
            }

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

            client.connect(server);

            if (!NNTPReply.isPositiveCompletion(client.getReplyCode()))
            {
                client.disconnect();
                System.err.println("NNTP server refused connection.");
                System.exit(1);
            }

            if (client.isAllowedToPost())
            {
                Writer writer = client.postArticle();

                if (writer != null)
                {
                    writer.write(header.toString());
                    Util.copyReader(fileReader, writer);
                    writer.close();
                    client.completePendingCommand();
                }
            }

            if (fileReader != null) {
                fileReader.close();
            }

            client.logout();

            client.disconnect();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1);
        }
    }
}