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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.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import org.apache.commons.net.pop3.POP3Client;
import org.apache.commons.net.pop3.POP3MessageInfo;

/***
 * This is an example program demonstrating how to use the POP3Client class.
 * This program connects to a POP3 server and retrieves the message
 * headers of all the messages, printing the From: and Subject: header
 * entries for each message.
 * 

* Usage: messages *

***/ public final class messages { public static final void printMessageInfo(BufferedReader reader, int id) throws IOException { String line, lower, from, subject; from = ""; subject = ""; while ((line = reader.readLine()) != null) { lower = line.toLowerCase(); if (lower.startsWith("from: ")) from = line.substring(6).trim(); else if (lower.startsWith("subject: ")) subject = line.substring(9).trim(); } System.out.println(Integer.toString(id) + " From: " + from + " Subject: " + subject); } public static final void main(String[] args) { int message; String server, username, password; POP3Client pop3; Reader reader; POP3MessageInfo[] messages; if (args.length < 3) { System.err.println( "Usage: messages "); System.exit(1); } server = args[0]; username = args[1]; password = args[2]; pop3 = new POP3Client(); // We want to timeout if a response takes longer than 60 seconds pop3.setDefaultTimeout(60000); try { pop3.connect(server); } catch (IOException e) { System.err.println("Could not connect to server."); e.printStackTrace(); System.exit(1); } try { if (!pop3.login(username, password)) { System.err.println("Could not login to server. Check password."); pop3.disconnect(); System.exit(1); } messages = pop3.listMessages(); if (messages == null) { System.err.println("Could not retrieve message list."); pop3.disconnect(); System.exit(1); } else if (messages.length == 0) { System.out.println("No messages"); pop3.logout(); pop3.disconnect(); System.exit(1); } for (message = 0; message < messages.length; message++) { reader = pop3.retrieveMessageTop(messages[message].number, 0); if (reader == null) { System.err.println("Could not retrieve message header."); pop3.disconnect(); System.exit(1); } printMessageInfo(new BufferedReader(reader), messages[message].number); } pop3.logout(); pop3.disconnect(); } catch (IOException e) { e.printStackTrace(); System.exit(1); } } }

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