Multipart transferTo looks for a wrong file address when using createTempFile

Question

I have the following java code in Spring framework to convert a multipart file to a regular file:

    public static File convertToFile(MultipartFile multipart) {         


        

Answer 1

So the code looks like this: StandardMultipartHttpServletRequest

public void transferTo(File dest) throws IOException, IllegalStateException {
  this.part.write(dest.getPath());
}

and MultiPartInputStreamParser:

    /**
     * @see javax.servlet.http.Part#write(java.lang.String)
     */
    public void write(String fileName) throws IOException
    {
        if (_file == null)
        {
            _temporary = false;

            //part data is only in the ByteArrayOutputStream and never been written to disk
            _file = new File (_tmpDir, fileName);

So in the case that the file isn't on disk, we will end up with /tmp twice.

I think this is a bug in StandardMultipartHttpServletRequest -- it is passing a path to something which expects a filename.