1.創建攔截器類實現HandlerInterceptor

//該攔截器類必須實現HandlerInterceptor接口，手動覆蓋其中的方法 public class MyInterceptor1 implements HandlerInterceptor {//目標方法執行之前執行@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("preHandle");return true;//這一步如果返回false，則下面所有的東西都不會被執行}//目標方法執行之后，視圖返回之前執行@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {System.out.println("postHandle");}//在整個流程都執行完畢之后執行@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {System.out.println("afterCompletion");} }

2.創建目標類

@Controller public class TargetController {@RequestMapping("/target")public ModelAndView show(){System.out.println("目標資源執行....");ModelAndView modelAndView = new ModelAndView();modelAndView.addObject("name","zsh");modelAndView.setViewName("index");return modelAndView;} }

3.在spring-mvc配置文件中指明攔截器類

<?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:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"><!--注解驅動--><mvc:annotation-driven/><!-- 掃描controller包下的類--><context:component-scan base-package="com.hao.controller"/><!-- 配置內部資源視圖解析器--><bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/"></property><property name="suffix" value=".jsp"></property></bean><!--開放靜態資源訪問權限--><mvc:default-servlet-handler/> <!-- <mvc:resources mapping="/js/**" location="/js/"/>--><!-- 配置攔截器--><mvc:interceptors><mvc:interceptor> <!-- 對哪些資源執行攔截操作--><mvc:mapping path="/**"/><!-- 可以添加多個攔截器--><bean class="com.hao.interceptor.MyInterceptor1"/></mvc:interceptor></mvc:interceptors> </beans>

4.web.xml配置前端控制器

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><!-- 配置springMVC的核心配置控制器DispatcherServlet--><servlet><servlet-name>DispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>DispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!-- 配置監聽器--><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 全局初始化參數,告訴配置文件路徑--><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><!-- 配置編碼過濾器--><filter><filter-name>CharacterEncoding</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>CharacterEncoding</filter-name><url-pattern>/*</url-pattern></filter-mapping> </web-app>

5.啟動tomcat進行測試,訪問http://localhost:8080/target
控制臺結果：

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攔截器方法說明：
1.preHandler：返回false，表示請求結束；后面的Interceptor和controller都不會再執行

2.postHandler：目標方法執行之后，視圖返回之前執行，所以可以對這個方法中的Controller處理之后的ModelAndView進行修改

3.afterCompletion：當前端控制器渲染了視圖之后執行

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