请求属性无法在spring微服务中访问

Question

I am setting up request attribute in overridden method doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) of class OncePerRequestFilter but i am unable to get request attribute in my service.

public class AuthenticationFilter extends OncePerRequestFilter {
    protected void doFilterInternal(HttpServletRequest httpServletRequest,
      HttpServletResponse httpServletResponse, FilterChain filterChain)
      throws ServletException, IOException {
      ....
      .....
      httpServletRequest.setAttribute("testing","testing");
       filterChain.doFilter(httpServletRequest, httpServletResponse);

    }
}


 @RequestMapping(
      value = "/index/{index:.+}",
      method = RequestMethod.GET,
      produces = { MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE })
  public ResponseEntity<RestApiModelResponse> getIndex(
      @PathVariable String index,
     HttpServletRequest httpServletRequest)
      throws Exception {
    var test = httpServletRequest.getAttribute("testing");

}

Here, I am getting null in test variable..

Answer 1

You need to define filter as @Component

@Component
public class AuthenticationFilter extends OncePerRequestFilter { 

In order for Spring to be able to recognize a filter, we needed to define it as a bean with the @Component annotation