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 018package org.apache.commons.net.examples.nntp; 019 020import java.io.BufferedReader; 021import java.io.IOException; 022import java.io.PrintWriter; 023import java.net.SocketException; 024 025import org.apache.commons.net.PrintCommandListener; 026import org.apache.commons.net.nntp.NNTPClient; 027import org.apache.commons.net.nntp.NewsgroupInfo; 028 029/** 030 * Sample program demonstrating the use of article header and body retrieval 031 */ 032public class ArticleReader { 033 034 public static void main(final String[] args) throws SocketException, IOException { 035 036 if (args.length != 2 && args.length != 3 && args.length != 5) { 037 System.out.println("Usage: MessageThreading <hostname> <groupname> [<article specifier> [<user> <password>]]"); 038 return; 039 } 040 041 final String hostname = args[0]; 042 final String newsgroup = args[1]; 043 // Article specifier can be numeric or Id in form <m.n.o.x@host> 044 final String articleSpec = args.length >= 3 ? args[2] : null; 045 046 final NNTPClient client = new NNTPClient(); 047 client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true)); 048 client.connect(hostname); 049 050 if (args.length == 5) { // Optional auth 051 final String user = args[3]; 052 final String password = args[4]; 053 if (!client.authenticate(user, password)) { 054 System.out.println("Authentication failed for user " + user + "!"); 055 System.exit(1); 056 } 057 } 058 059 final NewsgroupInfo group = new NewsgroupInfo(); 060 client.selectNewsgroup(newsgroup, group); 061 062 final BufferedReader brHdr; 063 String line; 064 if (articleSpec != null) { 065 brHdr = (BufferedReader) client.retrieveArticleHeader(articleSpec); 066 } else { 067 final long articleNum = group.getLastArticleLong(); 068 brHdr = client.retrieveArticleHeader(articleNum); 069 } 070 if (brHdr != null) { 071 while ((line = brHdr.readLine()) != null) { 072 System.out.println(line); 073 } 074 brHdr.close(); 075 } 076 final BufferedReader brBody; 077 if (articleSpec != null) { 078 brBody = (BufferedReader) client.retrieveArticleBody(articleSpec); 079 } else { 080 final long articleNum = group.getLastArticleLong(); 081 brBody = client.retrieveArticleBody(articleNum); 082 } 083 if (brBody != null) { 084 while ((line = brBody.readLine()) != null) { 085 System.out.println(line); 086 } 087 brBody.close(); 088 } 089 } 090 091}