java - 从 MimeMessage 中删除附件

Question

我正在从本地磁盘读取 eml 文件：

InputStream is = new FileInputStream(body_path);
MimeMessage message = new MimeMessage(session,is);
Multipart multipart = (Multipart)message.getContent();

现在如何删除“.dat”类型的附件？

Answer 1

你可以做这样的事情： -

编写 anew mimemsg并逐个添加除有扩展名的部分之外的所有部分DAT

撰写新消息：-

MimeMessage newMimeMsg;
MimeMultipart content;

if (mimemsg.isMimeType("multipart/*")) {
     Multipart multipartmsg = (Multipart) mimemsg.getContent();

for (int i = 0; i < multipartmsg.getCount(); ++i) {
MimeBodyPart bodypart = (MimeBodyPart) multipartmsg.getBodyPart(i);
if(getFileExtension(bodypart.getFileName()).equalsIgnoreCase("dat") {
    // Do Nothing
} else {
    content.addBodyPart(bodypart);
}
}
newMimeMsg.setContent(content);
} else {
   newMimeMsg = mimemsg;
}

public static String getFileExtension(String docFileName) {
        String[] tokens = docFileName.split("\\.(?=[^\\.]+$)");
        return tokens[1];
    }