Spring MVC 中 Json 响应的后处理 [英] Post processing of a Json response in spring MVC

问题描述

我有几个控制器使用@ResponseBody 注释返回相同的通用响应对象，如下所示:

I have several controllers that return the same generic Response object with @ResponseBody annotation, like this:

@RequestMapping(value = "/status", method = RequestMethod.GET)
    @Transactional(readOnly = true)
    public @ResponseBody Response<StatusVM> status()

在返回响应后，我需要对每个控制器执行操作.此操作将使用新数据丰富 Response 对象.

I need to perform an operation on every controller, after the Response is returned. This operation will enrich the Response object with new data.

我不想重复代码，所以我需要单点干预.但是，根据文档 http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-handlermapping-interceptor 这不适用于@ResponseBody:

I don't want to duplicate code, so I need a single point of intervention. I thought I could do this with Interceptors, however, according to the docs http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-handlermapping-interceptor this does not work well with @ResponseBody:

请注意，HandlerInterceptor 的 postHandle 方法并不总是非常适合与 @ResponseBody 和 ResponseEntity 方法一起使用.在这种情况下，HttpMessageConverter 在调用 postHandle 之前写入并提交响应，这使得无法更改响应，例如添加标头.相反，应用程序可以实现 ResponseBodyAdvice 并将其声明为 @ControllerAdvice bean 或直接在 RequestMappingHandlerAdapter 上进行配置.

我找不到这种技术的例子，有人能帮我吗?

I haven't been able to find an example of this tecnique, could anybody help me?

作为替代方案，我可以使用方面，但随后我需要对每个控制器进行注释，这是我想避免的.

As an alternative I could work with aspects, but then I'd need to annotate every controller, which is something I'd like to avoid.

推荐答案

最后我是这样实现 ResponseBodyAdvice 的:

In the end I implemented ResponseBodyAdvice like this:

@ControllerAdvice
public class StatusAdvice implements ResponseBodyAdvice<Response<?>> {


    @Override
    public boolean supports(MethodParameter returnType,
            Class<? extends HttpMessageConverter<?>> converterType) {

        if (returnTypeIsReponseVM(returnType)&&responseConverterIsJackson2(converterType)){
            return true;
        }

        return false;
    }

....

    @Override
    public Response<?> beforeBodyWrite(Response<?> body, MethodParameter returnType,
            MediaType selectedContentType,
            Class<? extends HttpMessageConverter<?>> selectedConverterType,
            ServerHttpRequest request, ServerHttpResponse response) {

        ....

        return body;
    }

}

所以比预期的要容易.

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