从虚拟文件系统到电子邮件的Java附加文件 [英] java attach file from virtual filesystem to email

问题描述

我正在使用虚拟文件系统，我想将其中的文件附加到电子邮件中.但是，MimeBodyPart对象仅使用文件，而这些文件在默认文件系统(如jimfs)上不起作用.请参阅下面的代码，当我尝试转换为文件时，在该错误消息中出现UnsupportedOperation异常.

I am using a virtual filesystem and I'd like to attach a file from it to an email. However, the MimeBodyPart object only takes Files, which don't work on a default filesystem like jimfs. See my code below, where I get an UnsupportedOperation exception when I try to convert to file.

public Email attach(Path file){
    MimeBodyPart attachment = new MimeBodyPart()
    attachment.attachFile(file.toFile())
    attachments.add(attachment)
    return this
}

推荐答案

由于jimfs文件不是真正文件，因此不能使用文件API.

Since jimfs files aren't really files, you can't use the File APIs.

一个简单的解决方法是使用 ByteArrayDataSource ，它将复制数据.

A simple workaround is to use ByteArrayDataSource, which will copy the data.

更好的方法是编写自己的PathDataSource，类似于

A better approach would be to write your own PathDataSource that's similar to FileDataSource but uses Files.newInputStream instead of FileInputStream. Then attach the file using:

MimeBodyPart mbp = new MimeBodyPart();
mbp.setDataHandler(new DataHandler(new PathDataSource(path)));
mbp.setFileName(path.getFileName().toString());
mbp.setDisposition(Part.ATTACHMENT);

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