MimeBodyPart 未为亚洲语言设置编码 UTF-8

Question

当我收到邮件时，我收到所有字符的问号。我很困惑我哪里出错了。有些附件显示正确，只有字符显示 ???? 像问号。我已验证 body 已正确转换为所有亚洲语言，但在发送邮件之前，我再次验证了他们显示的消息 ??。

  public void addAttachmentsforMail(String text, MimeMessage message, List<File> attachments, MimeSubtype mimeSubtype) throws MessagingException {

    MimeBodyPart mbpText = new MimeBodyPart();
    mbpText.setHeader("Content-Type", "text/plain;charset=utf-8");

//I have verified till here the body is getting converted to respective asian languages
    if(mimeSubtype.equals(MimeSubtype.HTML)) {
                   mbpText.setDataHandler(new DataHandler(new ByteArrayDataSource(body, "text/html")));        

            }

            Multipart mp = new MimeMultipart();
            mp.addBodyPart(mbpText);        

            MimeBodyPart mimeAttachment;
            for (File file : attachment) {

                mbpAttachment =  new MimeBodyPart();

                FileDataSource foo = new FileDataSource(file);
                mimeAttachment.setDataHandler(new DataHandler(foo));
                mimeAttachment.setHeader("Content-ID","<" + foo.getName() + ">");
                mimeAttachment.setFileName(foo.getName());

                mp.addBodyPart(mimeAttachment);


            }

   //But When I verify the message in log at here before sending the mail all the charcters were converted in to ???         

 message.setContent(mp);

transport.send(message)
        }

这是邮件的header

Message-ID: <-1251496143.10677.1468164058574.JavaMail.star@gmail.com>
Subject: =?UTF-8?B?5biQ5oi35Y+K5a+G56CB5o+Q6YaS?=
MIME-Version: 1.0
Content-Type: multipart/mixed; 
    boundary="----=_Part_10649_-1456564573.1468164040753"

------=_Part_10649_-1456564573.1468164040753
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

Answer 1

由于以下 mbpText.setDataHandler，mbpText.setHeader 调用无效。如果可能，请使用允许您指定字符集的 setText 方法。您可能还想将系统属性 "mail.mime.charset" 设置为 "utf-8".

MimeBodyPart 未为亚洲语言设置编码 UTF-8

MimeBodyPart not set encoding UTF-8 for Asian languages

java

utf-8

io

jakarta-mail

mime-message