[Spring] Support @ModelAttribute

Description

Way to generate @ModelAttribute strategy using parameter serialization .

Swagger-codegen version

io.springfox:springfox-swagger2

Swagger declaration file content or url

# description
pageParameter:
        in: query
        name: pageParameter
        schema:
            type: object
            properties:
                page:
                    type: integer
                    format: int32
                    minumum: 1
                    default: 1
                    example: 1
                size:
                    type: integer
                    format: int32
                    minumum: 10
                    default: 1000
                    example: 1000
                sort:
                    type: array
                    items:
                        type: string


# paths
get:
            operationId: getList
            parameters:
                - $ref: '#/parameters/pageParameter'

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

If I generate code using above yml file, it makes object parameter with @RequestParam like following .

default ResponseEntity<XXXX> getList(@ApiParam(value = "") @Valid @RequestParam(value = "pageParameter", required = false) PageParameter pageParameter) {
   // ....
}

But I wanna use multiple object parameter like .

get:
            operationId: getList
            parameters:
                - $ref: '#/parameters/pageParameter'
                - $ref: '#/parameters/searchParameter'

As you know, if they generate like below,

default ResponseEntity<XXXX> getList(@ApiParam(value = "") @Valid @ModelAttribute PageParameter pageParameter, @ModelAttribute SearchParameter searchParameter) {
   // ....
}

I can query http://XXX.com?page=1&size=10&name=XXX&age=10,
and they will be bind theirselves from this query parameter to all of that objects(PageParameter, SearchParameter) automatically. You know, It's feature of @ModelAttribute.

But it seems like that they doesn't suggest this feature.

Is there any way to achieve this?

Thank you.

No implementation files or tests are named. Reproduce the supplied OpenAPI YAML and inspect the Spring server-generation templates and parameter handling; done means multiple object query parameters generate separate Java arguments using @ModelAttribute rather than @RequestParam, with the existing request binding behavior preserved.