S02E05_MailEmpfaenger.java

package com.blogspot.debukkitsblog.mailing;

import java.io.IOException;
import java.util.Arrays;
import java.util.Properties;

import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Store;

import com.sun.mail.imap.IMAPStore;

public class StartMailEmpfaenger {

	public static void main(String[] args) {

		try {

			MailEmpfaenger empf = new MailEmpfaenger();
			empf.login("imap.gmail.com", "993", Zugangsdaten.USERNAME(), Zugangsdaten.PASSWORD());
			empf.check();

		} catch (Exception e) {
			e.printStackTrace();
		}

	}
	
	public static class MailEmpfaenger {

		protected IMAPStore imapStore;
		
		public void login(String host, String port, String username, String password) throws MessagingException {
			Properties props = new Properties();
			props.put("mail.store.protocol", "imaps");
			props.put("mail.imaps.port", port);
			props.put("mail.imaps.starttls.enable", "true");
			Session mailSession = Session.getDefaultInstance(props);
			
			Store store = mailSession.getStore("imaps");
			store.connect(host, username, password);
			this.imapStore = (IMAPStore) store;
		}
		
		public void check() throws MessagingException, IOException {
			if(imapStore == null) {
				throw new IllegalStateException("Du musst dich zuerst einloggen (login()-Methode)!");
			}
			
			Folder mailFolder = imapStore.getFolder("INBOX");
			mailFolder.open(Folder.READ_ONLY);
			
			System.out.println("Anzahl E-Mails: " + mailFolder.getMessageCount());
			System.out.println("-- davon ungelesen: " + mailFolder.getUnreadMessageCount());
			
			Message[] messages = mailFolder.getMessages(mailFolder.getMessageCount() - 10, mailFolder.getMessageCount());
			
			System.out.println("\n== Alle ungelesenen Nachrichten ==");
			for(int i = 0; i < messages.length; i++) {
				Message aktuelleMessage = messages[i];
				if(!aktuelleMessage.isSet(Flags.Flag.SEEN)) {
					System.out.println("  Datum/Uhrzeit: " + aktuelleMessage.getReceivedDate());
					System.out.println("  Von: " + Arrays.toString(aktuelleMessage.getFrom()));
					System.out.println("  Betreff: " + aktuelleMessage.getSubject());
					System.out.println("  Inhalt: " + aktuelleMessage.getContent());
				}
			}
			System.out.println("== Ende der ungelesenen Nachrichten ==");
			
			mailFolder.close();
			imapStore.close();
		}

	}

}