[JavaMail] Attachment name does not show correctly in Email

Problem
I am using JavaMail API to send email. But the attachment name does not show correctly.
The name should be 退匯明細表.pdf‎, but I got ATT97145.pdf‎.

The incorrect email looks like:


The expected email looks like:


Here is the code snippet to add attachment in email:

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private void attachFiles(MimeMessageHelper messageHelper, List<File> attachFiles) throws MessagingException { for (File attachFile : attachFiles) { FileSystemResource file = new FileSystemResource(attachFile); log.info("attachFile.getName():" + attachFile.getName()); try { messageHelper.addAttachment(attachFile.getName(), file); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); } } }

Solution
You can utilize MimeUtility.encodeText to handle the file name.
Here is the updated code snippet:

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private void attachFiles(MimeMessageHelper messageHelper, List<File> attachFiles) throws MessagingException { for (File attachFile : attachFiles) { FileSystemResource file = new FileSystemResource(attachFile); log.info("attachFile.getName():" + attachFile.getName()); try { messageHelper.addAttachment( MimeUtility.encodeText(attachFile.getName(), "UTF-8", null), file); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); } } }

Reference
[1] http://docs.oracle.com/javaee/6/api/javax/mail/internet/MimeUtility.html#encodeText(java.lang.String, java.lang.String, java.lang.String)