Sending Email request with calendar integration using Java

Email request with calendar integration

/**
	 * method to send mail request along with calendar intergration for interview
	 * @author simbu
	 * @param emails
	 * @param string
	 * @param subject
	 * @throws Exception
	 */
	public static void eventRequest(List<String> emails, String string, String subject) throws Exception {
		final MimetypesFileTypeMap mimetypes = (MimetypesFileTypeMap) MimetypesFileTypeMap.getDefaultFileTypeMap();
		mimetypes.addMimeTypes("text/calendar ics ICS");
		final MailcapCommandMap mailcap = (MailcapCommandMap) MailcapCommandMap.getDefaultCommandMap();
		mailcap.addMailcap("text/calendar;; x-java-content-handler=com.sun.mail.handlers.text_plain");

		// **************//
		// Provide SMTP Details
		final String username = "no-reply@sss.com"; // your username
		final String password = "no-reply@ddd.com003"; // your password

		Properties props = new Properties();
		props.put("mail.smtp.auth", "true");
		props.put("mail.smtp.startTLS.enable", "true");
		props.put("mail.smtp.host", "smtp.ss.com");
		props.put("mail.smtp.port", "587");
		props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
		props.put("mail.smtp.socketFactory.port", "465");
		props.put("mail.smtp.ssl.trust", "smtp.ssss.com");

		Session session = Session.getInstance(props, new javax.mail.Authenticator() {
			protected PasswordAuthentication getPasswordAuthentication() {
				return new PasswordAuthentication(username, password);
			}
		});

		// ************//

		MimeMessage message = new MimeMessage(session);
		try {
			message.setFrom(new InternetAddress(username));
		} catch (AddressException e) {
			e.printStackTrace();
			log.error(e);
		} catch (MessagingException e) {
			e.printStackTrace();
			log.error(e);
		}
		message.setSubject(subject);	// Subject of the event
		
		//adding emails to internetaddres
		for (String email : emails) {
			message.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
		}

		Multipart multipart = new MimeMultipart("alternative");

		BodyPart messageBodyPart = buildCalendarPart(string);
		multipart.addBodyPart(messageBodyPart);
		message.setContent(multipart);

		// send the message
		Transport transport = session.getTransport("smtp");
		transport.connect();
		transport.sendMessage(message, message.getAllRecipients());
		transport.close();
	}

	/**
	 * @author simbu
	 * @return description part along with design
	 * @throws MessagingException
	 */
	private static BodyPart buildHtmlTextPart() throws MessagingException {

		MimeBodyPart descriptionPart = new MimeBodyPart();

		// Note: even if the content is specified as being text/html, outlook
		// won't read correctly tables at all
		// and only some properties from div:s. Thus, try to avoid too fancy
		// content
		String content = "<h1 >simple meeting invitation</h1>";
		descriptionPart.setContent(content, "text/html; charset=utf-8");

		return descriptionPart;
	}

	/**
	 * @author simbu
	 * @param bodyMsg
	 * @return calendardata along with design
	 * @throws Exception
	 */
	private static BodyPart buildCalendarPart(String bodyMsg) throws Exception {

		BodyPart calendarPart = new MimeBodyPart();

		// TODO: DATE AND TIME OF EVENT
		Calendar cal = Calendar.getInstance();
		cal.add(Calendar.DAY_OF_MONTH, 1);
		Date start = cal.getTime();
		cal.add(Calendar.HOUR_OF_DAY, 3);
		final Date end = cal.getTime();

		// check the icalendar spec in order to build a more complicated meeting
		// request
		final String calendarContent = "BEGIN:VCALENDAR\n" + "METHOD:REQUEST\n" + "PRODID: BCP - Meeting\n" +  "VERSION:2.0\n" + "BEGIN:VEVENT\n" + "DTSTAMP:" + iCalendarDateFormat.format(start) + "\n" + "DTSTART:" + iCalendarDateFormat.format(start) + "\n" + "DTEND:" + iCalendarDateFormat.format(end) + "\n" + "SUMMARY:Interview with candidate\n" + "UID:324\n" + "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE:MAILTO:rajeshwright@gmail.com\n" + "ORGANIZER:MAILTO:rajeshwright@gmail.com\n"
				+ "LOCATION:Company\n" + "DESCRIPTION:" + bodyMsg + "\n" + "SEQUENCE:0\n" + "PRIORITY:5\n" + "CLASS:PUBLIC\n" + "STATUS:CONFIRMED\n" + "TRANSP:OPAQUE\n" + "BEGIN:VALARM\n" + "ACTION:DISPLAY\n" + "DESCRIPTION:REMINDER\n" + "END:VALARM\n" + "TRIGGER;RELATED=START:-PT00H15M00S\n" + "END:VEVENT\n" + "END:VCALENDAR";

		calendarPart.addHeader("Content-Class", "urn:content-classes:calendarmessage");
		calendarPart.setContent(calendarContent, "text/calendar;method=CANCEL");

		return calendarPart;
	}

This java code is used to sending email that contains accept, decline and later like meeting request , and can integrate with any email's calendar.

What is iCalendarDateFormat on line 105