001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package examples.nntp;
019
020 import java.io.IOException;
021 import org.apache.commons.net.nntp.NNTPClient;
022 import org.apache.commons.net.nntp.NewsgroupInfo;
023
024 /***
025 * This is a trivial example using the NNTP package to approximate the
026 * Unix newsgroups command. It merely connects to the specified news
027 * server and issues fetches the list of newsgroups stored by the server.
028 * On servers that store a lot of newsgroups, this command can take a very
029 * long time (listing upwards of 30,000 groups).
030 * <p>
031 ***/
032
033 public final class newsgroups
034 {
035
036 public final static void main(String[] args)
037 {
038 NNTPClient client;
039 NewsgroupInfo[] list;
040
041 if (args.length < 1)
042 {
043 System.err.println("Usage: newsgroups newsserver");
044 System.exit(1);
045 }
046
047 client = new NNTPClient();
048
049 try
050 {
051 client.connect(args[0]);
052
053 list = client.listNewsgroups();
054
055 if (list != null)
056 {
057 for (int i = 0; i < list.length; i++)
058 System.out.println(list[i].getNewsgroup());
059 }
060 else
061 {
062 System.err.println("LIST command failed.");
063 System.err.println("Server reply: " + client.getReplyString());
064 }
065 }
066 catch (IOException e)
067 {
068 e.printStackTrace();
069 }
070 finally
071 {
072 try
073 {
074 if (client.isConnected())
075 client.disconnect();
076 }
077 catch (IOException e)
078 {
079 System.err.println("Error disconnecting from server.");
080 e.printStackTrace();
081 System.exit(1);
082 }
083 }
084
085 }
086
087 }
088
089