Spring Boot controller - Upload Multipart and JSON to DTO

Question

I want to upload a file inside a form to a Spring Boot API endpoint.

The UI is written in React:

export function createExpense(formData) {
  return         


        

Answer 1

@RequestMapping(value = { "/test" }, method = { RequestMethod.POST })
@ResponseBody
public String create(@RequestParam("file") MultipartFile file, @RequestParam String description, @RequestParam ArrayList sharers) throws Exception {
    ExpensePostDto expensePostDto = new ExpensePostDto(file, description, sharers);
    // do your thing
    return "test";
}

This seems to be the easiest way out here, other ways could be to add your own messageConverter.