java - 从 bytearrayoutputstream 添加附件到邮件

Question

我正在尝试发送带有附件的电子邮件:

MimeMessageHelper message = new MimeMessageHelper(mimeMessage, false, CharEncoding.UTF_8);
InputStream is = new ByteArrayInputStream(baos.toByteArray());
message.addAttachment("facture.pdf",  new ByteArrayResource(IOUtils.toByteArray(is)));

我收到一个错误:

java.lang.IllegalStateException: Not in multipart mode - create an appropriate MimeMessageHelper via a constructor that takes a 'multipart' flag if you need to set alternative texts or add inline elements or attachments.

有没有办法让它在保留 addAttachment 方法的情况下工作？

Answer 1

从MimeMessageHelper的文档看来，您只需传递一个 true 标志。

MimeMessageHelper message = new MimeMessageHelper(mimeMessage, true, CharEncoding.UTF_8);