How to send an iCal meeting request using Java Mail, and receive the response

Question

I\'m trying to send an iCal to an outlook, using Java Mail Library, I\'ve read already the Question, and I already have some sample code

public class SendMe         


        

Answer 1

Here,

1 - Download jar from here (JavaMail API » 1.6.2).

2 - Copy and Paste the following code (Change variable values)

import java.util.Properties;
import javax.activation.DataHandler;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.util.ByteArrayDataSource;

public class Index {

public static void main(String[] args) {

     try {
            final String username = "sender@mail.com";
            final String password = "xxxxx";
            
            String from = "sender@mail.com";
            String to = "attendee@mail.com";
            String subject = "Meeting Subject";
            String startDate = "20201208"; // Date Formate: YYYYMMDD
            String endDate = "20201208"; // Date Formate: YYYYMMDD
            String startTime = "0400"; // Time Formate: HHMM
            String endTime = "0600"; // Time Formate: HHMM
            String emailBody = "Hi Team, This is meeting description. Thanks"; 
            
            Properties prop = new Properties();
            prop.put("mail.smtp.auth", "true");
            prop.put("mail.smtp.starttls.enable", "true");
            prop.put("mail.smtp.host", "smtp.gmail.com");
            prop.put("mail.smtp.port", "25");

            Session session = Session.getDefaultInstance(prop,  new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
              });
            
            MimeMessage message = new MimeMessage(session);
            message.addHeaderLine("method=REQUEST");
            message.addHeaderLine("charset=UTF-8");
            message.addHeaderLine("component=VEVENT");

            message.setFrom(new InternetAddress(from, "New Outlook Event"));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);

            StringBuffer sb = new StringBuffer();

            StringBuffer buffer = sb.append("BEGIN:VCALENDAR\n" +
                    "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n" +
                    "VERSION:2.0\n" +
                    "METHOD:REQUEST\n" +
                    "BEGIN:VEVENT\n" +
                    "ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:"+ to +"\n" +
                    "DTSTART:"+ startDate +"T"+ startTime +"00Z\n" +
                    "DTEND:"+ endDate +"T"+ endTime +"00Z\n" +
                    "LOCATION:Conference room\n" +
                    "TRANSP:OPAQUE\n" +
                    "SEQUENCE:0\n" +
                    "UID:040000008200E00074C5B7101A82E00800000000002FF466CE3AC5010000000000000000100\n" +
                    " 000004377FE5C37984842BF9440448399EB02\n" +
                    "CATEGORIES:Meeting\n" +
                    "DESCRIPTION:"+ emailBody +"\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");

            // Create the message part
            BodyPart messageBodyPart = new MimeBodyPart();

            // Fill the message
            messageBodyPart.setHeader("Content-Class", "urn:content-  classes:calendarmessage");
            messageBodyPart.setHeader("Content-ID", "calendar_message");
            messageBodyPart.setDataHandler(new DataHandler(
                    new ByteArrayDataSource(buffer.toString(), "text/calendar")));// very important

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

            // Add part one
            multipart.addBodyPart(messageBodyPart);

            // Put parts in message
            message.setContent(multipart);

            // send message
            Transport.send(message);
            
            System.out.println("Email sent!");
        } catch (MessagingException me) {
            me.printStackTrace();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
}
}

3 - That's all, hit RUN......