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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. 15 * 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 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 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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