日历邀请作为附件而不是邀请

Question

我尝试在Outlook（2013）中发送日历邀请，但是作为附件文件发送而不是使用java发送邀请。

Properties prop = new Properties();
prop.put("mail.smtp.port", port );
prop.put("mail.smtp.auth", "false");
prop.put("mail.smtp.host", host );
Session session = Session.getDefaultInstance(prop);
session.setDebug(true);

//Define message
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(sender));

//Set TO
if( to != null && ( to.length > 0 ) ) {
  InternetAddress[] address = new InternetAddress[ to.length ] ;
  for( int i = 0; i < to.length; i++ ) {
    address[ i ] = new InternetAddress( to[ i ] ) ;
  }
  message.setRecipients( Message.RecipientType.TO, address ) ;
}
message.setSubject(subject);

StringBuffer messageText = new StringBuffer();
messageText.append("BEGIN:VCALENDAR\n" +
  "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n" +
  "VERSION:2.0\n" +
  "METHOD:REQUEST\n" +
  "BEGIN:VEVENT\n" +
  "ORGANIZER:MAILTO:" ) ;
messageText.append( organizer ) ;
messageText.append( "\n" + "DTSTART:");
messageText.append( dateformat.format( start ) ) ;
messageText.append( "\n" + "DTEND:" ) ;
messageText.append( dateformat.format( end ) ) ;
messageText.append( "\n" + "LOCATION:" ) ;
messageText.append( location ) ;
messageText.append( "\n" + "UID:" ) ;
messageText.append( invitationId ) ;
messageText.append( "\n" + "DTSTAMP:" ) ;
messageText.append( dateformat.format( new java.util.Date() ) ) ;
messageText.append( "\n" + "DESCRIPTION;ALTREP=\"CID:<eventDescriptionHTML>\"" ) ;
messageText.append( "\n" +
  "BEGIN:VALARM\n" +
  "TRIGGER:-PT15M\n" +
  "ACTION:DISPLAY\n" +
  "DESCRIPTION:Reminder\n" +
  "END:VALARM\n" +
  "END:VEVENT\n" +
  "END:VCALENDAR"
) ;

MailcapCommandMap mc = (MailcapCommandMap)CommandMap.getDefaultCommandMap();
mc.addMailcap("text/calendar;;x-java-content-
handler=com.sun.mail.handlers.text_plain");
CommandMap.setDefaultCommandMap(mc);
MimetypesFileTypeMap mimetypes = (MimetypesFileTypeMap)MimetypesFileTypeMap.getDefaultFileTypeMap();
mimetypes.addMimeTypes("text/calendar ics ICS");
MimetypesFileTypeMap.setDefaultFileTypeMap(mimetypes);
BodyPart calendarPart = new MimeBodyPart();
calendarPart.addHeader("Content-Class", "urn:content-classes:calendarmessage");
calendarPart.setContent(messageText.toString(), "text/calendar;method=CANCEL");

Multipart mp = new MimeMultipart();
MimeBodyPart meetingPart = new MimeBodyPart() ;
meetingPart.setDataHandler( new DataHandler( new StringDataSource( messageText.toString(), "text/calendar", "meetingRequest" ) ) ) ;
mp.addBodyPart( meetingPart ) ;
MimeBodyPart descriptionPart = new MimeBodyPart() ;
descriptionPart.setDataHandler( new DataHandler( new StringDataSource( 
description, "text/html", "eventDescription" ) ) ) ;
descriptionPart.setContentID( "<eventDescriptionHTML>" ) ;
mp.addBodyPart( descriptionPart ) ;
message.setContent( mp ) ;

// send message
Transport.send(message);