如何在拦截器中读取httpServletResponse? [英] How to read httpServletResponse in the interceptor?

问题描述

我有一个 Spring Boot 应用程序.现在我需要在拦截器中读取请求和响应.我使用 HttpServletRequestWrapper 替换 DispatcherServlet

I have a spring boot application. And now I need to read request and response in interceptor.I use a HttpServletRequestWrapper replace the request in DispatcherServlet

@Component("dispatcherServlet")
public class FofDisPatcherServlet extends DispatcherServlet {
    @Override
    protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
        MultiReadHttpServletRequest requestWrapper = null;
        try {
            requestWrapper = new MultiReadHttpServletRequest(request);
            super.doDispatch(requestWrapper, response);
        } catch (Exception e) {
            super.doDispatch(request,response);
        }
    }
}

在我的拦截器中，我可以读取请求正文.但是当我想读取响应正文时，它不起作用.当我替换 CustomerDispatcherServlet 中的响应时，我没有任何响应.我尝试过 ContentCachingResponseWrapper ，但我得到带有"的payload.

And in my interceptor , I can read the request body. But when I want to read the response body, it doesn't works.when I replace the response in the CustomerDispatcherServlet I got nothing response.I have tried ContentCachingResponseWrapper , but I got the payload with "".

这是一个老问题.我搜索了一些问题，但没有找到合适的解决方案.

It's a old question.and I have search some questions but didn't find a suitable solution.

我知道我可以用AOP解决这个问题.但是我想知道我在拦截器中怎么做?

I know I can solve the problem with AOP.But I want to know how can I do it in the interceptor?

这是我的拦截器代码

public class CustomerInterceptor extends HandlerInterceptorAdapter{
    @Override
    public void postHandle(...){
        MultiReadHttpServletRequest req = (MultiReadHttpServletRequest) request;
        ContentCachingResponseWrapper res = new ContentCachingResponseWrapper(response);
        Byte[] body = res. getContentAsByteArray();
        ...
    }
}

我得到的身体是 [].

the body I got is [].

推荐答案

几天后，我找到了答案.在 CustomerDispatcherServlet 我应该添加 responseWrapper.copyBodyToResponse()

After few days .I find the answer.In the CustomerDispatcherServlet I should add responseWrapper.copyBodyToResponse()

CustomerDIspatcherServlet 像这样:

@Component("dispatcherServlet")
public class FofDisPatcherServlet extends DispatcherServlet {
    @Override
    protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
        MultiReadHttpServletRequest requestWrapper = null;
        try {
            requestWrapper = new MultiReadHttpServletRequest(request);
            if (!(response instanceof ContentCachingResponseWrapper)) {
                ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
                super.doDispatch(requestWrapper, responseWrapper);
                responseWrapper.copyBodyToResponse();
            }else {
                super.doDispatch(requestWrapper, response);
            }
        } catch (Exception e) {
            super.doDispatch(request, response);
        }
    }
}    

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