Controller中request的疑问

@Controller
public class AController{

    protected HttpServletRequest request;
    protected HttpServletResponse response;
    
    @ModelAttribute
    public void bindRequestObject(HttpServletRequest request, HttpServletResponse response) {
        this.request = request;
        this.response = response;
    }
    
    @RequestMapping("/test")
    public Result test(){
        System.out.println(request.toString());
    }
}