spring - 为什么没有像 RequestContextHolder 这样的 Response 持有者类

Question

为什么 Spring 对于 HttpServletResponse 没有像 RequestContextHolder 这样的类?在某些情况下，我需要访问响应对象。例如，spring security 正在为成功登录创建一个 InteractiveSuccessEvent。我的事件处理程序需要为 cookie 正确设置一些值，但我不知道修改 HttpServletResponse 的显式方法目的。

编辑:处理程序示例

@Component
public class ActivityLoginSuccessEventHandler implements ApplicationListener<InteractiveAuthenticationSuccessEvent> {

   @Override
   public void onApplicationEvent(InteractiveAuthenticationSuccessEvent event) {
      //todo cookie
   }
}

Answer 1

我最终得到了一个简单的过滤器。

public class ResponseContextHolderFilter extends OncePerRequestFilter {

   @Override
   protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
      try {
         RequestAndResponseContextHolder.response(response);
      } finally {
         filterChain.doFilter(request, response);
      }
   }
}


public class RequestAndResponseContextHolder {

   public static final String RESPONSE_NAME_AT_ATTRIBUTES =
      ServletRequestAttributes.class.getName() + ".ATTRIBUTE_NAME";


   public static HttpServletResponse response() {
      RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
      HttpServletResponse response = null;
      if(requestAttributes != null) {
         ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
         response = (HttpServletResponse) servletRequestAttributes.getAttribute(RESPONSE_NAME_AT_ATTRIBUTES, RequestAttributes.SCOPE_REQUEST);
      }
      return response;
   }

   public static HttpServletRequest request() {
      RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
      HttpServletRequest request = null;
      if(requestAttributes != null) {
         ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
         request = servletRequestAttributes.getRequest();
      }
      return request;
   }

   public static void response(HttpServletResponse response) {
      RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

      if(requestAttributes != null) {
         ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
         servletRequestAttributes.setAttribute(RESPONSE_NAME_AT_ATTRIBUTES, response, RequestAttributes.SCOPE_REQUEST);
      }
   }
}