Of type javax.servlet.http.Part in conjunction with Servlet 3.0 multipart requests
When a parameter is annotated with @RequestPart, the content of the part is
passed through an HttpMessageConverter to resolve the method argument with the
'Content-Type' of the request part in mind. This is analogous to what @RequestBody
does to resolve an argument based on the content of a regular request.
When a parameter is not annotated or the name of the part is not specified,
it is derived from the name of the method argument.
Resolves a method parameter into an argument value from a given request.
A ModelAndViewContainer provides access to the model for the
request. A WebDataBinderFactory provides a way to create
a WebDataBinder instance when needed for data binding and
type conversion purposes.