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@Controller public class UploadController { @PostMapping("/upload") public String upload(@RequestParam("file") MultipartFile file) { // save } }

How to specify/config that only images(jpeg, png) are allowed to be uploaded?

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You should do a check on file.getContentType() if it matches "image/jpeg" or "image/png". Not sure if consumes property of the @PostMapping would work because the request is of type "multipart/form-data" or "application/x-www-form-urlencoded" it seems.

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