How to attach multiple files in java?

Question

The following code is used to attach the files in java. I want to sent multiple files attachments through Email. Any suggestion should be appreciated.

public class SendMail {

    public SendMail() throws MessagingException {

        String host = "smtp.gmail.com";
        String Password = "mnmnn";
        String from = "[email protected]";
        String toAddress = "[email protected]";
        String filename = "C:/Users/hp/Desktop/Write.txt";
        // Get system properties
        Properties props = System.getProperties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtps.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getInstance(props, null);

        MimeMessage message = new MimeMessage(session);

        message.setFrom(new InternetAddress(from));

        message.setRecipients(Message.RecipientType.TO, toAddress);

        message.setSubject("JavaMail Attachment");

        BodyPart messageBodyPart = new MimeBodyPart();

        messageBodyPart.setText("Here's the file");

        Multipart multipart = new MimeMultipart();

        multipart.addBodyPart(messageBodyPart);

        messageBodyPart = new MimeBodyPart();

        DataSource source = new FileDataSource(filename);

        messageBodyPart.setDataHandler(new DataHandler(source));

        messageBodyPart.setFileName(filename);

        multipart.addBodyPart(messageBodyPart);

        message.setContent(multipart);

        try {
            Transport tr = session.getTransport("smtps");
            tr.connect(host, from, Password);
            tr.sendMessage(message, message.getAllRecipients());
            System.out.println("Mail Sent Successfully");
            tr.close();

        } catch (SendFailedException sfe) {

            System.out.println(sfe);
        }
    }
}` 

Answer 1

Well, it's been a while since I've done JavaMail work, but it looks like you could just repeat this code multiple times:

DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);

For example, you could write a method to do it:

private static void addAttachment(Multipart multipart, String filename)
{
    DataSource source = new FileDataSource(filename);
    messageBodyPart.setDataHandler(new DataHandler(source));
    messageBodyPart.setFileName(filename);
    multipart.addBodyPart(messageBodyPart);
}

Then from your main code, just call:

addAttachment(multipart, "file1.txt");
addAttachment(multipart, "file2.txt");

etc

Answer 2

just add another block with using the filename of the second file you want to attach and insert it before the message.setContent(multipart) command

    messageBodyPart = new MimeBodyPart();

    DataSource source = new FileDataSource(filename);

    messageBodyPart.setDataHandler(new DataHandler(source));

    messageBodyPart.setFileName(filename);

    multipart.addBodyPart(messageBodyPart);

Answer 3

Just add more files to the multipart.