spring拦截器配置

1、新增一个拦截器的类继承HandlerInterceptor，并重写里面的preHandle方法

@Componentpublic class AccessInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        String path = httpServletRequest.getRequestURI();        HttpSession session = httpServletRequest.getSession();        User user = (User) session.getAttribute("loginUser");        if(user==null){            httpServletResponse.setContentType("application/json");            httpServletResponse.setCharacterEncoding("utf-8");            JsonResult result = new JsonResult("需要重新登录");            ObjectMapper mapper = new ObjectMapper();            String jsonResult = mapper.writeValueAsString(result);            httpServletResponse.getWriter().print(jsonResult);            httpServletResponse.flushBuffer();            return false;        }        return true;    }

2、在spring-mvc配置文件中增加如下配置。所有请求路径是notebook的都会拦截。

 <mvc:interceptors>        <mvc:interceptor>            <mvc:mapping path="/notebook/*"/>            <ref bean="accessInterceptor"/>        </mvc:interceptor>    </mvc:interceptors>