Apache Commons Email encode attach with base64

问题:

I'm trying to send a file base64-encoded via apache.commons.mail and I just can't seam to get the Content-Transfer-Encoding: base64 header where it's supposed to go.

// Create the email
MultiPartEmail email = new MultiPartEmail();
email.setSmtpPort(587);
email.setDebug(false);
email.setHostName("smtp.gmail.com");
email.setAuthentication("[e-mail]", "password");
email.setTLS(true);

email.addTo("[e-mail]");
email.setFrom("[e-mail]");
email.setSubject("subject");

email.attach(new ByteArrayDataSource(
     Base64.encodeBase64(attachFull.getBytes()), "text/plain"), 
     "samplefile.txt", 
     "sample file desc", 
     EmailAttachment.ATTACHMENT
);

And this is what gets to the recipient.

------=_Part_0_614021571.1334210788719
Content-Type: text/plain; charset=Cp1252; name=texto.txt
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment; filename=samplefile.txt
Content-Description: sample file desc

How I can specify that the file is Base64 encoded?

回答1:

You might try overriding the attach method and set the Content-Transfer-Encoding header in there. By default the framework doesn't set it for you or expose the MIME bodyPart cleanly.

回答2:

The easiest solution would be to do something like this:

// create a multipart leg for a specific attach
MimeMultipart part = new MimeMultipart();
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setDataHandler (new DataHandler(new ByteArrayDataSource(attachFull.getBytes(), "text/plain")));
messageBodyPart.removeHeader("Content-Transfer-Encoding");
messageBodyPart.addHeader("Content-Transfer-Encoding", "base64");
part.addBodyPart(messageBodyPart);
email.addPart(part);

And javax will automatically convert your file to base64.

Hope it helps.