如何使用多部分/表单数据？

Question

I need to implement a REST-Endpoint, that receives multipart/form-data
I use
- Spring Boot
- Kotlin
- Spring MVC

A multipart form submit with the following parts:

deployment-name ----- text/plain
enable-duplicate-filtering ----- text/plain
deploy-changed-only ----- text/plain
deployment-source ----- text/plain
tenant-id ----- text/plain
* ----- application/octet-stream

The Rest Controller looks so:

    @PostMapping("/data/deployment/create")
    fun uploadDmn(@RequestBody() file: Any){

    }

When I receive a request, then there is an error:

Content type 'multipart/form-data;boundary=--------------------------914124725006223485188585;charset=UTF-8' not supported]

If I use "MultipartFile" instead of any, then is file NULL.

    @PostMapping("/data/deployment/create")
    fun uploadDmn(@RequestBody() file: MultipartFile){

    }

Example of Request:

--28319d96a8c54b529aa9159ad75edef9
Content-Disposition: form-data; name="deployment-name"

aName
--28319d96a8c54b529aa9159ad75edef9
Content-Disposition: form-data; name="enable-duplicate-filtering"

true
--28319d96a8c54b529aa9159ad75edef9
Content-Disposition: form-data; name="deployment-source"

process application
--28319d96a8c54b529aa9159ad75edef9
Content-Disposition: form-data; name="data"; filename="test.bpmn"

<?xml version="1.0" encoding="UTF-8"?>
<bpmn2:definitions ...>
  <!-- BPMN 2.0 XML omitted -->
</bpmn2:definitions>
--28319d96a8c54b529aa9159ad75edef9--

Can anyone help please?

Answer 1

Retrofit has documentation on FORM ENCODED AND MULTIPART

The gist is to annotate the function with @Multipart and annotate your file as @Part