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javahtmlemailjakarta-mailmime-types

JavaMail: MimeMessage sent as plain text when HTML is expected?

I have the following Java code in my Spring REST Web App:

Code:

@Service("Mailer")
public class Mailer {

    private final JavaMailSender mailSender;

    private void send(final Email email){

        MimeMessage mimeMessage = mailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage);
        helper.setFrom(address);
        helper.setTo(email.to());
        helper.setSubject(email.subject());

        helper.setText(email.content(), true); //is this correct?

        mailSender.send(mimeMessage);

    }

}

MimeMessageHelper setText():

public void setText(String text, boolean html) throws MessagingException {
        Assert.notNull(text, "Text must not be null");
        MimePart partToUse;
        if (isMultipart()) {
            partToUse = getMainPart();
        }
        else {
            partToUse = this.mimeMessage;
        }
        if (html) {
            setHtmlTextToMimePart(partToUse, text);
        }
        else {
            setPlainTextToMimePart(partToUse, text);
        }
    }

My code sends an email as expected but when I receive it - it is in pain text.

I.e. the HTML is not rendered in the email body and the email starts with:

<!DOCTYPE html>
<html lang="en">
   <head>
...

How can I ensure that the email is sent and rendered as HTML not plain text?

Solution

  • Try setting the MimeMessage content directly like this.

    mimeMessage.setContent(email.content(), "text/html");
mimeMessage.saveChanges();