/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.mail;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.pop3.POP3Client;
import org.apache.commons.net.pop3.POP3MessageInfo;
import org.apache.commons.net.pop3.POP3SClient;
/**
* This is an example program demonstrating how to use the POP3[S]Client class.
* This program connects to a POP3[S] server and retrieves the message
* headers of all the messages, printing the From: and Subject: header
* entries for each message.
* <p>
* Usage: POP3Mail <pop3[s] server hostname> <username> <password> [secure protocol, e.g. TLS]
* <p>
*/
public final class POP3Mail
{
public static final void printMessageInfo(BufferedReader reader, int id) throws IOException {
String from = "";
String subject = "";
String line;
while ((line = reader.readLine()) != null)
{
String lower = line.toLowerCase(Locale.ENGLISH);
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)
{
if (args.length < 3)
{
System.err.println(
"Usage: POP3Mail <pop3 server hostname> <username> <password> [TLS [true=implicit]]");
System.exit(1);
}
String server = args[0];
String username = args[1];
String password = args[2];
String proto = args.length > 3 ? args[3] : null;
boolean implicit = args.length > 4 ? Boolean.parseBoolean(args[4]) : false;
POP3Client pop3;
if (proto != null) {
System.out.println("Using secure protocol: "+proto);
pop3 = new POP3SClient(proto, implicit);
} else {
pop3 = new POP3Client();
}
System.out.println("Connecting to server "+server+" on "+pop3.getDefaultPort());
// We want to timeout if a response takes longer than 60 seconds
pop3.setDefaultTimeout(60000);
// suppress login details
pop3.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
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);
}
POP3MessageInfo[] messages = pop3.listMessages();
if (messages == null)
{
System.err.println("Could not retrieve message list.");
pop3.disconnect();
return;
}
else if (messages.length == 0)
{
System.out.println("No messages");
pop3.logout();
pop3.disconnect();
return;
}
for (POP3MessageInfo msginfo : messages) {
BufferedReader reader = (BufferedReader) pop3.retrieveMessageTop(msginfo.number, 0);
if (reader == null) {
System.err.println("Could not retrieve message header.");
pop3.disconnect();
System.exit(1);
}
printMessageInfo(reader, msginfo.number);
}
pop3.logout();
pop3.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
return;
}
}
}