To send multiple attachments, create a body part for each file that you want to send.

Check out the sample code from this tutorial on the JavaMail API:


http://developer.java.sun.com/developer/onlineTraining/JavaMail/contents.html#SendingAttachments

Here is the code you would need to repeat per file:

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