java如何在HandlerInterceptor的afterCompletion（）中获取响应数据

Question

我试图在Spring HandlerInterceptor的afterCompletion（）中获取响应数据，但获取的数据为空

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    try {
         ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper(request);
         byte[] contentAsByteArray = responseWrapper.getContentAsByteArray();
    } finally {
        SessionManagerThreadLocal.remove();
    }
}

contentAsByteArray字节[]为空

我该怎么办？谢谢

Answer 1

在您的描述中，您说您正在尝试获得响应，但在代码中，您使用的是请求和请求映射器。如果您想使用请求，您需要添加过滤器，它将请求存储在包装器中

@Component
public class CachingRequestBodyFilter extends GenericFilterBean {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
            throws IOException, ServletException {
        ContentCachingRequestWrapper wrappedRequest = new ContentCachingRequestWrapper((HttpServletRequest) servletRequest);

        //this line is necessary to cache InputStream
        wrappedRequest.getInputStream();

        chain.doFilter(wrappedRequest, servletResponse);
    }
}