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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
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    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache Commons" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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    54   * <http://www.apache.org/>;.
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    56
    57  import java.io.IOException;
    58  import org.apache.commons.net.nntp.NNTPClient;
    59  import org.apache.commons.net.nntp.NewsgroupInfo;
    60
    61  /****
    62   * This is a trivial example using the NNTP package to approximate the
    63   * Unix newsgroups command.  It merely connects to the specified news
    64   * server and issues fetches the list of newsgroups stored by the server.
    65   * On servers that store a lot of newsgroups, this command can take a very
    66   * long time (listing upwards of 30,000 groups).
    67   * <p>
    68   ***/
    69
    70  public final class newsgroups
    71  {
    72
    73      public final static void main(String[] args)
    74      {
    75          NNTPClient client;
    76          NewsgroupInfo[] list;
    77
    78          if (args.length < 1)
    79          {
    80              System.err.println("Usage: newsgroups newsserver");
    81              System.exit(1);
    82          }
    83
    84          client = new NNTPClient();
    85
    86          try
    87          {
    88              client.connect(args[0]);
    89
    90              list = client.listNewsgroups();
    91
    92              if (list != null)
    93              {
    94                  for (int i = 0; i < list.length; i++)
    95                      System.out.println(list[i].getNewsgroup());
    96              }
    97              else
    98              {
    99                  System.err.println("LIST command failed.");
    100                 System.err.println("Server reply: " + client.getReplyString());
    101             }
    102         }
    103         catch (IOException e)
    104         {
    105             e.printStackTrace();
    106         }
    107         finally
    108         {
    109             try
    110             {
    111                 if (client.isConnected())
    112                     client.disconnect();
    113             }
    114             catch (IOException e)
    115             {
    116                 System.err.println("Error disconnecting from server.");
    117                 e.printStackTrace();
    118                 System.exit(1);
    119             }
    120         }
    121
    122     }
    123
    124 }
    125
    126

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