JavaMail sending mail attachment from string - encoding UTF-8

Question

My application has to send a textfile, which it first has to generate as a String. The text contains non-ASCII symbols, so i would like it to be UTF-8. I\'ve tried a lot of vari

Answer 1

This works:

        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(sendFrom);
        msg.setSubject(subject, "utf-8");
        msg.setSentDate(new Date());

        // create and fill the first message part
        MimeBodyPart mbp1 = new MimeBodyPart();
        mbp1.setContent(message,"text/plain; charset=UTF-8");
        // mbp1.setContent(message,"text/html; charset=UTF-8"); // with this the attachment will fail

        // create the Multipart and its parts to it
        Multipart mp = new MimeMultipart();
        mp.addBodyPart(mbp1);

        if (attachment!=null){
            // Part two is attachment
            MimeBodyPart mbp2 = new MimeBodyPart();
            mbp2 = new MimeBodyPart();

            DataSource ds = null;
            try {
                ds = new ByteArrayDataSource(attachment.getBytes("UTF-8"), "application/octet-stream");
                } catch (IOException e) {
                e.printStackTrace();
            }
            mbp2.setDataHandler(new DataHandler(ds));
            mbp2.addHeader("Content-Type", "text/plain; charset=\"UTF-8\"");
            mbp2.addHeader("Content-Transfer-Encoding", "base64");

            mbp2.setFileName("attachment.txt");
            mbp2.setDisposition(Part.ATTACHMENT);
            mp.addBodyPart(mbp2);
        }

        // add the Multipart to the message
        msg.setContent(mp);
        msg.saveChanges();

        // send the message
        Transport.send(msg);

Answer 2

Set the content type to application/octet-stream:

MimeBodyPart attachmentPart = new MimeBodyPart();

try {
  DataSource ds = new ByteArrayDataSource(attachment.getBytes("UTF-8"), "application/octet-stream");
  attachmentPart = new MimeBodyPart();
  attachmentPart.setDataHandler(new DataHandler(ds));
} 
catch (Exception e) {
  Logger.getLogger("Blina").log(Level.SEVERE, Misc.getStackTrace(e));
}

attachmentPart.setFileName(fileName);
multipart.addBodyPart(attachmentPart);

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