Upload File in Spring without using form data

Question

I am using Spring framework in Java. With it I am trying to write an API endpoint that accepts one file for upload. I do NOT want to use form data. Basically I want the following curl command to work on my endpoint

curl -XPOST localhost:8080/upload -d @local_file.data

Is there a way to do that with Spring? It seems like I want to use @RequestBody with File but that somehow seems like a horrible idea to most people. Why? How is MultipartFile different from File? Only because it supports form data?

All I can find is talk of forms and MultipartFile. Is what I'm doing somehow inherently wrong? I've done it before using Python/Django and it wasn't that hard.

It way not be wrong, but without form-data you'd be in trouble creating a web-frontend for your app. If you know you will always and only curl into your app you should be fine. — Jan
– Jan, Commented Dec 8, 2015 at 5:43

EricGreg · Accepted Answer · 2015-12-08 13:57:49Z

6

It seems like the answer to my question is to use @RequestBody with a byte array. This kicks in the ByteArrayHttpMessageConverter which is one of the default HttpMessageConverters. I end up with an API endpoint like this.

@RequestMapping(value = "/upload", method=RequestMethod.POST)
public Response uploadFile(@RequestBody byte[] file) {
  ...
}

Preliminary testing works. Found it in Spring docs here: http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-ann-requestbody

answered Dec 8, 2015 at 13:57

EricGreg

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