Spring中登录的拦截器

 

定义拦截器类如下：

public class LoginInterceptor extends HandlerInterceptorAdapter {

       @Override
       public void afterCompletion(HttpServletRequest request,
                  HttpServletResponse response, Object handler, Exception ex)
                   throws Exception {
            
      }

       @Override
       public void postHandle(HttpServletRequest request,
                  HttpServletResponse response, Object handler,
                  ModelAndView modelAndView) throws Exception {
            
      }

       @Override
       public boolean preHandle(HttpServletRequest request,
                  HttpServletResponse response, Object handler) throws Exception {
             // TODO Auto-generated method stub
            
          // 访问url不是/login.do时拦截
          if (request.getServletPath().startsWith( "/cmmn/menu/login") || request.getServletPath().startsWith("/cmmn/index" )) {  
              return true ;  
          }  
          // 用户Id没有的时候拦截      
          if (SessionUtil.getAttribute( "sesUserId" ) != null ) {  
              return true ;  
          }  
                
          response.sendRedirect(request.getContextPath() + "/" );  
          return false ;
      }
}

  

在applicationContext.xml中配置如下：

< beans xmlns ="http://www.springframework.org/schema/beans" xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p ="http://www.springframework.org/schema/p" xmlns:context ="http://www.springframework.org/schema/context"
        xmlns:mvc ="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation ="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
                http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

              < mvc:annotation-driven />

       <!-- 以下配置将拦截所有的URL请求 -->
       < mvc:interceptors>
             < bean class ="egovframework.rte.interceptor.LoginInterceptor" />
       </ mvc:interceptors>

 

 

•  注意以下几点：

 

      1)beans中必须添加

           xmlns:mvc ="http://www.springframework.org/schema/mvc"

                      xsi:schemaLocation ="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

      2）开启mvc注解

                     < mvc:annotation-driven />

      3）配置自己定义的拦截

       < mvc:interceptors>

                         <!-- class为自己创建的拦截类 -->

             < bean class ="egovframework.rte.interceptor.LoginInterceptor" />

       </ mvc:interceptors>