springMVC实现过滤器

package com.shaokp.hrm.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.shaokp.hrm.entity.User;public class AuthorizedInterceptor implements HandlerInterceptor{    private static final String[] LOGIN_URI={"/login","/loginCheck","404.html"};    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        boolean flag=false;        String servletPath = request.getServletPath();        for(String path:LOGIN_URI){            if(servletPath.contains(path)){                flag=true;                break;            }        }        if(!flag){            User user = (User)request.getSession().getAttribute("user");            if(user==null){                request.setAttribute("message", "请先登录再访问网站");                request.getRequestDispatcher("/login").forward(request,response);            }        }else{            flag=true;        }        return flag;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {    }}

spring-mvc的配置

<!-- 启用默认配置 -->    <mvc:annotation-driven/>    <mvc:default-servlet-handler/><!-- 权限检查拦截器 -->    <mvc:interceptors>        <mvc:interceptor>            <mvc:mapping path="/*"/>            <bean class="com.shaokp.hrm.interceptor.AuthorizedInterceptor"/>        </mvc:interceptor></mvc:interceptors>

设置web.xml中的默认拦截器，不拦截静态资源（也可以不写。也可以写自定义的）
在springmvc的Dispatcher中配置（一般Web应用服务器默认的Servlet名称是”default”，所以这里我们激活Tomcat的defaultServlet来处理静态文件，在web.xml里配置如下代码即可：）

<!--该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录，如原来访问http://localhost/foo.css,现在http://localhost/static/foo.css　--> <!-- 不拦截静态文件 --> <servlet-mapping>    <servlet-name>default</servlet-name>    <url-pattern>/js/*</url-pattern>    <url-pattern>/css/*</url-pattern>    <url-pattern>/images/*</url-pattern>    <url-pattern>/fonts/*</url-pattern>  </servlet-mapping>