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This file 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.

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The source code

/*
 * Copyright 2001-2004 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;

import java.io.IOException;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;

/***
 * This is a trivial example using the NNTP package to approximate the
 * Unix newsgroups command.  It merely connects to the specified news
 * server and issues fetches the list of newsgroups stored by the server.
 * On servers that store a lot of newsgroups, this command can take a very
 * long time (listing upwards of 30,000 groups).
 * 

***/ public final class newsgroups { public final static void main(String[] args) { NNTPClient client; NewsgroupInfo[] list; if (args.length < 1) { System.err.println("Usage: newsgroups newsserver"); System.exit(1); } client = new NNTPClient(); try { client.connect(args[0]); list = client.listNewsgroups(); if (list != null) { for (int i = 0; i < list.length; i++) System.out.println(list[i].getNewsgroup()); } else { System.err.println("LIST command failed."); System.err.println("Server reply: " + client.getReplyString()); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (client.isConnected()) client.disconnect(); } catch (IOException e) { System.err.println("Error disconnecting from server."); e.printStackTrace(); System.exit(1); } } } }

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