Category: Hacking

I have the feeling, that i might need this someday :-).

Collecting Mails from an IMAP Server with Java is pretty easy:

package de.javastream.imapcollector;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Properties;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeBodyPart;
import javax.swing.JOptionPane;

public class App {

    public static void getMail(String host, String user, String passwd) throws Exception {
        Session session = Session.getDefaultInstance(new Properties());
        Store store = session.getStore("imap");
        store.connect(host, user, passwd);
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);
        // the funny part is... you can count all the messages before you download them.
        Message[] messages = folder.getMessages();
        System.out.println("there are "+messages.length+" in your INBOX.");
        for (int i = 0; i <; messages.length; i++) {
            Message m = messages[i];
            System.out.println("Nachricht: " + i);
            System.out.println("From: " + m.getFrom()[0]);
            System.out.println("Subject: " + m.getSubject());
            // some Messages are multipart messages (e.g. text with an attachement)
            if (m.getContentType().equals("multipart")) {
                Multipart mp = (Multipart) m.getContent();
                for (int j = 0; j <; mp.getCount(); j++) {
                    Part part = mp.getBodyPart(j);
                    String disposition = part.getDisposition();
                    if (disposition == null) {
                        MimeBodyPart mimePart = (MimeBodyPart) part;
                        if (mimePart.isMimeType("text/plain")) {
                            BufferedReader in = new BufferedReader(
                                    new InputStreamReader(mimePart.getInputStream()));
                            for (String line; (line = in.readLine()) != null;) {
                                System.out.println(line);
                            }
                        }
                    }
                }
            } else {
                System.out.println(m.getContent());
            }
        }
        System.out.println("done :-)");
        folder.close(false);
        store.close();
    }

    public static void main(String[] args) throws Exception {
        // show some simple Dialogs to get server, username and password
        String server = JOptionPane.showInputDialog("enter your Mail Server e.g. mail.example.com");
        String user = JOptionPane.showInputDialog("enter your login e.g. user");
        String password = JOptionPane.showInputDialog("enter your mail password");
        getMail(server, user, password);
    }
}

Becource you will need the java mail lib as a dependency i just created a small maven project to add them.
Just unzip it and run

mvn exec:java

Download Maven Project for ImapCollector

Update:
A Colleague of mine asks for the imports of that Code. I just added them to the sources. You have to include the javamail lib from Sun Oracle as a dependency to run the code.