Monitoring an E-Mail Account - Java Network

Java examples for Network:EMail

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Description

Monitoring an E-Mail Account 

import java.util.Arrays;
import java.util.Properties;

import javax.mail.Address;
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 javax.mail.internet.InternetAddress;

public class Main {
  boolean shouldContinue = true;
  Thread mailCheckingThread = null;

  public static void main(String[] args) {
    Main recipe = new Main();
    recipe.start();
  }

  public void start() {
    mailCheckingThread = new Thread(() -> {
      while (shouldContinue) {
        checkForMail();
        try {
          Thread.sleep(5000);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    });
    mailCheckingThread.start();

  }

  public void stop() {
    shouldContinue = false;
    mailCheckingThread.interrupt();
    try {
      mailCheckingThread.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }

  private void checkForMail() {
    Properties properties = new Properties();
    String username = "mymodule";
    String password = "java9test";
    String folder = "Inbox";
    String host = "imap.gmail.com";

    try {
      Session session = Session.getDefaultInstance(properties, null);
      Store store = session.getStore("imaps");
      store.connect(host, username, password);
      Folder inbox = store.getFolder(folder);
      inbox.open(Folder.READ_WRITE);
      int messageCount = inbox.getMessageCount();
      Message messages[] = inbox.getMessages(1, messageCount);
      for (Message message : messages) {
        boolean hasBeenRead = false;
        if (Arrays.asList(message.getFlags().getSystemFlags()).contains(
            Flags.Flag.SEEN)) {
          continue; // not interested in "seen" messages
        }
        if (processMessage(message)) {
          System.out.println("Processed :" + message.getSubject());
          message.setFlag(Flags.Flag.DELETED, true);
        } else {
          System.out.println("Couldn't Understand :" + message.getSubject());
          // set it as seen, but keep it around
          message.setFlag(Flags.Flag.SEEN, true);
        }
      }
      inbox.close(true);
    } catch (MessagingException e) {
      e.printStackTrace();
    }
  }

  private boolean processMessage(Message message) throws MessagingException {
    boolean result = false;

    String subject = message.getSubject().toLowerCase();
    if (subject.startsWith("subscribe")) {
      String emailAddress = extractEmail(message.getFrom());
      if (emailAddress != null) {
        System.out.println("Subscribing for :" + emailAddress);
        result = true;
      }

    } else if (subject.startsWith("unsubscribe")) {
      String emailAddress = extractEmail(message.getFrom());
      if (emailAddress != null) {
        System.out.println("UNsubscribing for :" + emailAddress);
        result = true;
      }
    }

    return result;
  }

  private String extractEmail(Address[] addressArray) {
    if ((addressArray == null) || (addressArray.length < 1))
      return null;
    if (!(addressArray[0] instanceof InternetAddress))
      return null;
    InternetAddress internetAddress = (InternetAddress) addressArray[0];
    return internetAddress.getAddress();
  }
}

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