How to transfer MultipartFile and File in java

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MultipartFile to File

The company's business needs to receive pictures or documents (multipart/form-data) submitted by the front desk (ps: I don't know if it's misspelled hee hee)

Received in the background needs to be converted to a File type

So here is the issue of type conversion:

List my code first:

@ PostMapping ("upload") @ ResponseBody public void upload (HttpServletResponse response,MultipartFile file) throws IOException {/ / MultipartFile file = ((MultipartHttpServletRequest) request) .getFile ("file"); PrintWriter writer = response.getWriter (); File f = null; if (file.equals (") | file.getSize ()