post.java

apache推出的net包

/*
 * Copyright 2001-2005 The Apache Software Foundation
 *
 * Licensed 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.io.Util;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NNTPReply;
import org.apache.commons.net.nntp.SimpleNNTPHeader;

import examples.PrintCommandListener;

/***
 * 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 post
{

    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 && organization.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)));

            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();
                }
            }

            fileReader.close();

            client.logout();

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