public void beforeBodyWriteInternal(JSONPObject jsonpObject, MediaType contentType,
                                        MethodParameter returnType, ServerHttpRequest request, ServerHttpResponse response) {
        //MediaType contentTypeToUse = getContentType(contentType, request, response);
        //response.getHeaders().setContentType(contentTypeToUse);
    }
Created by SongLing.Dong on 7/22/2017.
<p>
Wrap with the return object from method annotated by <code>@ResponseJSONP</code>
in order to be serialized into jsonp format.
</p>
<p>
<p>
url: /path/to/your/api?<b>callback=functionName</b>
</p>

@see JSONPObject
@see ResponseJSONP
@since Spring 4.2 when ResponseBodyAdvice is supported.
<p>
In Spring 3.x, use method directly return a <code>JSONPObject</code> instead.
</p>
src/main/java/com/alibaba/fastjson/support/spring/JSONPResponseBodyAdvice.java