Help creating a Meeting Request for Outlook using JAVA

"al" <>
16 Mar 2007 08:38:36 -0700
I have been trying to figure out a way to create a meeting request
programmatically using JAVA Mail. So far I was able to create an email
and a meeting that goes out as an attachment, which users can open and
accept/decline and so forth.

I have not been able to send this as an actual meeting request. I want
it to work as if a meeting reminder that comes from Google Calendar
(if set up to send reminders to other emails that use Outlook) and
shows up on Outlook Calendar.

I have tried several things but no success. I have not modified the
code after doing several attempts to fix it, so it might have a lot of
redundant information.

Any Help would be appreciated...


public class CalendarRequest {
    public CalendarRequest() {

    public static void main(String[] args) {
        try {
            CalendarRequest email = new CalendarRequest();
        catch (Exception e) { e.printStackTrace(); }

    public void send() throws Exception {
        String host = "";
        String from = "";
        String to = "";
        Properties prop = new Properties();
        // prop.put("", "mailhost"); -- format
        prop.put("", host);

        try {
            Session session = Session.getDefaultInstance(prop, null);
            // Define message
            MimeMessage message = new MimeMessage(session);

            message.addHeader("Mime-Version", "1.0");
            message.addHeader("PRODID","-//Microsoft Corporation//Outlook 10.0
            message.addHeader("method","REQUEST"); // Can be CANCEL to cancel
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new
            message.setSubject("Outlook Meeting Request Using JavaMail");

            StringBuffer sb ;
            StringBuffer msg = CalendarRequest.EmailMessage();

            // Microsoft
            StringBuffer buffer = CalendarRequest.createMeetingText();

            StringDataSource sdSource = new StringDataSource(buffer.toString(),
"text/calendar", "meetingRequest");

            // Fill the message
            MimeBodyPart meetingPart = new MimeBodyPart(); // for meeting
            MimeBodyPart messageBody = new MimeBodyPart(); // for email message
            MimeBodyPart attachmentBody = new MimeBodyPart(); // for

            meetingPart.setDataHandler(new DataHandler(sdSource));
            messageBody.setHeader("Content-ID", "calendar_message");
      messageBody.setContent(msg.toString(), "text/plain");

            // Create a Multipart
            Multipart multipart = new MimeMultipart();

            // Add part one - meeting request - not working right now
            multipart.addBodyPart(meetingPart); // adds the actual meeting
            // add part two - actual email message
            multipart.addBodyPart(messageBody); // add the email description

            // Part three is attachment

            String filename = "DCM Request.ics"; // need to change this later
            attachmentBody.setContent(buffer.toString(), "text/plain");

            // Add part two

            // Put parts in message

            // send message

        } catch (MessagingException me) {
        } catch (Exception ex) {

    public static StringBuffer EmailMessage()
        StringBuffer bf = new StringBuffer();
        bf.append("Here is the line1 of email\n"
                + "Here is line2 of message\n"
                + "Create an HTML file instead"
        return bf;

    public static StringBuffer createMeetingText()
        StringBuffer sb = new StringBuffer();
                + "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"
                + "VERSION:2.0\n"
                + "METHOD:REQUEST\n"
                + "BEGIN:VEVENT\n"
                + "\n"
                + "DTSTART:20070316T053000Z\n"
                + "DTEND:20070316T060000Z\n"
                + "LOCATION:Conference room\n"
                + "TRANSP:OPAQUE\n"
                + "SEQUENCE:0\n"
                + "UID:
                + " 000004377FE5C37984842BF9440448399EB02\n"
                + "DTSTAMP:20051206T120102Z\n"
                + "CATEGORIES:Meeting\n"
                + "DESCRIPTION:This the description of the meeting.\n\n"
                + "SUMMARY:Test meeting request\n" + "PRIORITY:5\n"
                + "CLASS:PUBLIC\n" + "BEGIN:VALARM\n"
                + "TRIGGER:PT1440M\n" + "ACTION:DISPLAY\n"
                + "DESCRIPTION:Reminder\n" + "END:VALARM\n"
                + "END:VEVENT\n" + "END:VCALENDAR");

    return sb;

    private static class StringDataSource implements DataSource {
        private String contents;
        private String mimetype;
        private String name;

        public StringDataSource(String contents, String mimetype, String
name) {
            this.contents = contents;
            this.mimetype = mimetype;
   = name;

        public String getContentType() {
                return (mimetype);

        public String getName() {
            return (name);

        public InputStream getInputStream() {
            InputStream is = null;
            try {
                is = new BufferedInputStream(new FileInputStream(

            } catch (Exception ex) {
                System.out.println("Exception occured: " + ex.getMessage());
            return is;


        public OutputStream getOutputStream() {

            ByteArrayOutputStream out = new ByteArrayOutputStream();
            return out; // doing nothing - including error handling later...

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