Using @RequestParam for multipartfile is a right way?

ghz 1years ago ⋅ 226 views

Question

I'm developing a spring mvc application and I want to handle multipart request in my controller. In the request I'm passing MultiPartFile also, currently I'm using @RequestParam to get the file parameter, the method look like,

@RequestMapping(method = RequestMethod.POST)
public def save(
        @ModelAttribute @Valid Product product,
        @RequestParam(value = "image", required = false) MultipartFile file) {
    .....
}

Above code works well in my service and the file is getting on the server side. Now somewhere I saw that in cases that file need to use @RequestPart annotation instead of @RequestParam. Is there anything wrong to use @RequestParam for file ? Or it may cause any kind of error in future?

Answer

It is nothing wrong using @RequestParam with Multipart file.

@RequestParam annotation can also be used to associate the part of a "multipart/form-data" request with a method argument supporting the same method argument types. The main difference is that when the method argument is not a String, @RequestParam relies on type conversion via a registered Converter or PropertyEditor while @RequestPart relies on HttpMessageConverters taking into consideration the 'Content-Type' header of the request part. @RequestParam is likely to be used with name-value form fields while @RequestPart is likely to be used with parts containing more complex content (e.g. JSON, XML).

See <http://docs.spring.io/spring/docs/current/javadoc- api/org/springframework/web/bind/annotation/RequestPart.html>

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