Send an E-Mail with attachment using JAVA Mail API without storing in local machine

Question

I have report in my jsp page and I am writing that report in PDF Format. And I want to send the PDF as E-Mail with attachment, but I don\'t want store the file

Answer 1

You have to write your own implementation of javax.activation.DataSource to read the attachment data from an memory instead of using one of the included implementations (to read from a file, a URL, etc.). If you have the PDF report in a byte array, you can implement a DataSource which returns the byte array wrapped in a ByteArrayOutputStream.

Answer 2

Since JavaMail 1.4 - mail.jar - contains javax.mail.util.ByteArrayDataSource

• https://javamail.java.net/nonav/docs/api/javax/mail/util/ByteArrayDataSource.html
• ( https://javamail.java.net/nonav/docs/api/ )
• http://www.oracle.com/technetwork/java/javamail/index-138643.html - download location

regards

Answer 3

If you use Spring's JavaMail API, you can do this sort of thing fairly easily (or at least, as easily as the JavaMail API allows, which isn't much). So you could write something like this:

JavaMailSenderImpl mailSender = ... instantiate and configure JavaMailSenderImpl here
final byte[] data = .... this holds my PDF data

mailSender.send(new MimeMessagePreparator() {
   public void prepare(MimeMessage mimeMessage) throws Exception {
      MimeMessageHelper helper = new MimeMessageHelper(mimeMessage);
     // set from, to, subject using helper
     helper.addAttachment("my.pdf", new ByteArrayResource(data));
   } 
});

The attachment data can be any of Spring's Resource abstractions, ByteArrayResource is just one of them.

Note that this part of the Spring API stands on its own, it does not require (but does benefit from) the Spring container.