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

Give this a try:

String attachment = "Привет";
DataSource ds = new ByteArrayDataSource(attachment, "text/plain; charset=UTF-8");
messageBodyPart.setDataHandler(new DataHandler(ds));

UPDATE: (full example)

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Session;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.util.ByteArrayDataSource;

public class Main {
    public static void main(String[] args) throws Exception {
        String attachment = "Привет";
        DataSource ds = new ByteArrayDataSource(attachment, "text/plain; charset=UTF-8");
        MimeBodyPart attachmentPart = new MimeBodyPart();
        attachmentPart.setDataHandler(new DataHandler(ds));

        MimeBodyPart bodyPart = new MimeBodyPart();
        bodyPart.setText("Hello this is some text");

        MimeMultipart mp = new MimeMultipart("mixed");
        mp.addBodyPart(bodyPart);
        mp.addBodyPart(attachmentPart);

        MimeMessage msg = new MimeMessage((Session)null);
        msg.setContent(mp);

        msg.writeTo(System.out);
    }
}

output:

Message-ID: <1439781957.1.1297366787857.JavaMail.dnault@dnault.local>
MIME-Version: 1.0
Content-Type: multipart/mixed; 
    boundary="----=_Part_0_1579321858.1297366787792"

------=_Part_0_1579321858.1297366787792
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Hello this is some text
------=_Part_0_1579321858.1297366787792
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64

0J/RgNC40LLQtdGC
------=_Part_0_1579321858.1297366787792--

Answer 2

If problem is in file name, rather than in body, following code helped in my (hebrew) case:

MimeBodyPart attachment = new MimeBodyPart();
attachment.setFileName(MimeUtility.encodeText(filename, "UTF-8", null));

Answer 3

I used to try send file name in url encoded. And it works for gmail

messageBodyPart.setFileName(UriUtils.encodePath(attachment.getAttachmentName(), "UTF-8"))

full code here:

if (!CollectionUtils.isEmpty(requestMessage.getAttachments())) {
            MimeBodyPart messageBodyPart;
            String fileName;
            File file;
            for (Attachment attachment : requestMessage.getAttachments()) {
                messageBodyPart = new MimeBodyPart();
                fileName = attachment.getAttachmentName();
                file = new File(fileName);
                FileUtils.writeByteArrayToFile(file, attachment.getAttachment());
                messageBodyPart.setDataHandler(new DataHandler(new FileDataSource(file)));
                messageBodyPart.setFileName(UriUtils.encodePath(attachment.getAttachmentName(), "UTF-8"));
                messageBodyPart.setDisposition(Part.ATTACHMENT);
                multipart.addBodyPart(messageBodyPart);
            }
        }

Answer 4

Had similar case, following code solved it:

MimeBodyPart att = new MimeBodyPart();
att.setFileName(MimeUtility.encodeText(fileName));

Answer 5

This is a sample code that I use to send files (irrespective on encoding or data structure).

BodyPart fileBodyPart = new MimeBodyPart();
fileBodyPart.setDataHandler(new DataHandler(fileDataSource));
fileBodyPart.setFileName(attachment.getName());
fileBodyPart.setHeader("Content-Type", fileDataSource.getContentType());
fileBodyPart.setHeader("Content-ID", attachment.getName());
fileBodyPart.setDisposition(Part.INLINE);

Where fileDataSource is a javax.activation.DataSource (text file will be in here), and fileBodyPart.setDisposition(Part.INLINE); (PART.INLINE means datasource is inlined with the message body, just like HTML emails, PART.ATTACHMENT means datasource is an attachment).

Hope this helps.

Answer 6

One more possibility:

String attachment = "älytöntä";
MimeBodyPart part = new MimeBodyPart();
part.setText(attachment, "UTF-8");
part.setDisposition("attachment");
part.setFileName("attachment.txt");
part.setHeader("Content-Transfer-Encoding", "base64");
part.setHeader("Content-type", "text/plain; charset=utf-8");