springmvc拦截器

拦截器：需要实现HandlerInterceptor

@Override
    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,
            Object arg2) throws Exception {
        String url=arg0.getRequestURI();
        if(url.indexOf("/login")>0){
            return true;
        }
        
        HttpSession session=arg0.getSession();
        if(session.getAttribute("user")!=null){
            return true;
        }
        arg0.setAttribute("msg", "没有登陆");
        arg0.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(arg0, arg1);
        return false;
    }

 

配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

       <context:component-scan base-package="com.fu" />

<!-- 拦截器配置-->
       <mvc:interceptors>
           <mvc:interceptor>
               <mvc:mapping path="/**"/>
               <mvc:exclude-mapping path="/**/*.js"/>
               <bean class="com.fu.interceptor.LoginInterceptor"></bean>
           </mvc:interceptor>
       </mvc:interceptors>

<!--过滤静态资源-->
       <mvc:resources location="/js/" mapping="/js/**"></mvc:resources>
       <mvc:annotation-driven />
       <!-- 试图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    
    
</beans>