import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.*;

public class MailReceiver extends JFrame {

   private JTextField host = new JTextField("imap.gmail.com");
   private JTextField port = new JTextField("993");
   private JTextField username = new JTextField();
   private JTextField password = new JTextField();
   private JTextField numberOfMessages = new JTextField("10");
   private JTextArea messages = new JTextArea();

   public static void main(String[] args) {
      new MailReceiver();
   }

   public MailReceiver() {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      JPanel panel = new JPanel();
      panel.setLayout(new GridLayout(5, 2));
      panel.add(new JLabel("Host:"));
      panel.add(host);
      panel.add(new JLabel("Port:"));
      panel.add(port);
      panel.add(new JLabel("Username:"));
      panel.add(username);
      panel.add(new JLabel("Password:"));
      panel.add(password);
      panel.add(new JLabel("Antal meddelanden:"));
      panel.add(numberOfMessages);

      JButton button = new JButton("Receive");
      button.addActionListener(new L());

      getContentPane().add("North", panel);
      getContentPane().add("South", button);
      getContentPane().add("Center", new JScrollPane(messages));

      setSize(640, 400);
      show();
   }

   public void receive() {
      try {
         Properties props = new Properties();
         props.setProperty("mail.store.protocol","imap");
         props.setProperty("mail.imap.host", host.getText());
         props.setProperty("mail.imap.port", port.getText());
         props.setProperty("mail.imap.ssl.enable","true");
         //props.setProperty("mail.debug", "true");

         Session session = Session.getDefaultInstance(props, null);
         //session.setDebug(true);

         // Get the store
         Store store = session.getStore("imap");
         store.connect(host.getText(), Integer.parseInt(port.getText()), username.getText(), password.getText());

         // Get hold of the default folder
         Folder folder = store.getDefaultFolder();
         if (folder == null) throw new Exception("No default folder");
          // ... and its INBOX
         folder = folder.getFolder("INBOX");
         if (folder == null) throw new Exception("No POP3 INBOX");
         // -- Open the folder for read only --
         folder.open(Folder.READ_ONLY);

         // Get directory
         Message message[] = folder.getMessages();

         messages.setText("");
         //for (int i = 0, n = message.length; i < n; i++) {
         for (int i = 0, n = Integer.parseInt(numberOfMessages.getText()); i < n; i++) {
           //messages.append("FROM: " + message[i].getFrom()[0] + "\n" + "SUBJECT: " + message[i].getSubject() + "\n");
           //messages.append((String)message[i].getContent() + "\n");

           printMessage(message[i]);
           //Thread.sleep(1000);
           messages.update(messages.getGraphics());
         }

         folder.close(false);
         store.close();
      } catch(Exception e) {}
   }

   public void printMessage(Message message) {
     try {
       // Get the header information
       String from = ((InternetAddress)message.getFrom()[0]).getPersonal();
       if (from == null) from = ((InternetAddress)message.getFrom()[0]).getAddress();
       messages.append("FROM: " + from + "\n");

       String subject = message.getSubject();
       messages.append("SUBJECT: " + subject + "\n");

       // -- Get the message part (i.e. the message itself) --
       Part messagePart = message;
       Object content = messagePart.getContent();
       // -- or its first body part if it is a multipart message --
       if (content instanceof Multipart) {
         messagePart=((Multipart)content).getBodyPart(0);
         messages.append("<MEDDELANDE MED BIFOGADE FILER>" + "\n");
       }
       // -- Get the content type --
       String contentType = messagePart.getContentType();
       // -- If the content is plain text, we can print it --
       // messages.append("CONTENT TYPE: " + contentType + "\n");
       if (contentType.startsWith("text/plain") || contentType.startsWith("text/html") || contentType.startsWith("TEXT/PLAIN") || contentType.startsWith("TEXT/HTML")) {
         InputStream is = messagePart.getInputStream();
         BufferedReader reader = new BufferedReader(new InputStreamReader(is));
         String thisLine = reader.readLine();
         while (thisLine != null) {
           messages.append(thisLine + "\n");
           thisLine = reader.readLine();
           //System.out.println(thisLine);
         }
       }
       messages.append("##############################" + "\n");
     } catch (Exception ex) {
       ex.printStackTrace();
     }
   }

   class L implements ActionListener {
      public void actionPerformed(ActionEvent ae) {
         receive();  
      }
   }
}