filter拦截指定注解

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        try {
            boolean ifPassToken = false;
            HttpServletRequest httprequest = (HttpServletRequest) servletRequest;
            List<HandlerMapping> handlerMappings = dispatcherServlet.getHandlerMappings();
            if (handlerMappings != null) {
                for (HandlerMapping mapping : handlerMappings) {
                    HandlerExecutionChain handlers = null;
                    try {
                        handlers = mapping.getHandler(httprequest);
                    } catch (Exception e) {
                        throw new RuntimeException(e);
                    }
                    if (handlers != null) {
                        if (handlers.getHandler() instanceof HandlerMethod) {
                            HandlerMethod handlerMethod = (HandlerMethod) handlers.getHandler();
                            Method method = handlerMethod.getMethod();
                            if (method.isAnnotationPresent(PassToken.class)) {
                                PassToken passToken = method.getAnnotation(PassToken.class);
                                if (passToken.required()) {
                                    ifPassToken = true;
                                    break;
                                }
                            }
                        }
                    }
                }
            }