handler 类型在转换异常

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@Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,     ModelAndView modelAndView) throws Exception {        HandlerMethod hMethod = (HandlerMethod)handler;        //参与成员发送消息        RequiredSendMessage requiredInterceptor = AnnotationUtils.findAnnotation(hMethod.getMethod(), RequiredSendMessage.class);          if(requiredInterceptor!=null){              List<OaMessage> messageList = (List) request.getAttribute("messageList");            if(messageList!=null&&messageList.size()>0){                int len = messageList.size();                for(int i=0;i<len;i++){                    OaMessage omessage = messageList.get(i);                    oaMessageService.sendProjectMessage(omessage);                }            }        }      }

这样会抛类型装换异常的
你的请求里面还带有其他的请求的时候，而且不是你配置的拦截的规则，那么它转换类型的时候就报错了。我这边是页面请求里面还有js的请求，所以controller的方法请求通过了，js的拦截到的时候，你的handler 其实不是你配置的那个，所以就出现这个问题了

解决办法：

@Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,             ModelAndView modelAndView) throws Exception {//handler=default//异常        if (!(handler instanceof HandlerMethod)) {            return;        }         HandlerMethod hMethod = (HandlerMethod)handler;        //参与成员发送消息        RequiredSendMessage requiredInterceptor = AnnotationUtils.findAnnotation(hMethod.getMethod(), RequiredSendMessage.class);          if(requiredInterceptor!=null){              List<OaMessage> messageList = (List) request.getAttribute("messageList");            if(messageList!=null&&messageList.size()>0){                int len = messageList.size();                for(int i=0;i<len;i++){                    OaMessage omessage = messageList.get(i);                    oaMessageService.sendProjectMessage(omessage);                }            }        }      }

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