說明：僅供自己學習理解筆記使用
spring mvc 攔截器需要實現HandlerInterceptor接口
public class UserIsLoginInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("Pre-handle"); return false; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("Post-handle"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("After completion handle"); } }
模擬一個控制器：
@Controller public class AddUserController { @RequestMapping(value = "/user/addUi", method = RequestMethod.GET) public String addUi() { return "addUser"; } }
spring的配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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.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:annotation-config />
<context:component-scan base-package="net.viralpatel.spring3.controller"/>
<!--注冊spring mvc 攔截器-->
<mvc:interceptors>
<bean class="com.yjdgis.interceptor.UserIsLoginInterceptor" />
</mvc:interceptors>
<!--多個攔截器的注冊-->
<!--<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">
<property name="interceptors">
<list>
<ref bean="com.yjdgis.interceptor.handlerInterceptor1"/>
<ref bean="com.yjdgis.interceptor.handlerInterceptor2"/>
</list>
</property>
</bean> -->
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
則攔截器的執行順序就是此處添加攔截器的順序；會輸出：
HandlerInterceptor1 preHandle
HandlerInterceptor2 preHandle
HandlerInterceptor2 postHandle
HandlerInterceptor1 postHandle
HandlerInterceptor2 afterCompletion
HandlerInterceptor1 afterCompletion
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
附加說明：
spring配置文件注冊攔截器一
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.yjdgis.interceptors.MyInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
spring攔截器注冊二
bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name="interceptors">
<list>
<bean class="com.yjdgis.interceptors.MyInterceptor"></bean>
</list>
</property>
</bean>
在方法二中不可使用<mvc:annotation-driven />。 它默認已經注冊了DefaultAnnotationHandlerMapping，AnnotationMethodHandlerAdapter
<!-- 包掃描，注冊了各種處理器，<mvc:annotation-driven />也有可能重復注冊好多處理器。只有我們都熟悉了，再使用完全自動化吧 -->
<context:component-scan base-package="com.yjdgis"/>
多攔截器注冊：
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.yjdgis.interceptors.MyInterceptor1"></bean>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.yjdgis.interceptors.MyInterceptor2"></bean>
</mvc:interceptor>
</mvc:interceptors>