SpringMVC拦截器详解

<? xml version = "1.0" encoding = "UTF-8" ?>

< web-app xmlns = "http://xmlns.jcp.org/xml/ns/javaee"

          xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

          xsi:schemaLocation = "http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

          version = "4.0" >

<!--    配置springMvc中央处理器-->

     < servlet >

         < servlet-name >springMVC</ servlet-name >

         < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class >

<!--        初始化的时候配置加载springmvc的配置文件-->

         < 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 >

<!--    3、修改web.xml中的请求路径地址方式-->

     < servlet-mapping >

         < servlet-name >springMVC</ servlet-name >

<!--        3、修改web.xml中的请求路径地址方式-->

         < url-pattern >/</ url-pattern >

<!--        <url-pattern>*.do</url-pattern>-->

     </ servlet-mapping >

<!--

  1、将css文件使用默认处理方式进行处理，不再交由中央控制器处理，

          设置路径的更高匹配优先级

  -->

<!--    <servlet-mapping>-->

<!--        <servlet-name>default</servlet-name>-->

<!--        <url-pattern>*.css</url-pattern>-->

<!--        <url-pattern>*.js</url-pattern>-->

<!--        <url-pattern>*.jpg</url-pattern>-->

<!--        <url-pattern>*.png</url-pattern>-->

<!--        <url-pattern>*.html</url-pattern>-->

<!--    </servlet-mapping>-->

</ web-app >

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

        xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

        xmlns:context = "http://HdhCmsTestspringframework.org/schema/context"

        xmlns:mvc = "http://HdhCmsTestspringframework.org/schema/mvc"

        xsi:schemaLocation="

        http://HdhCmsTestspringframework.org/schema/beans

        http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd

        http://HdhCmsTestspringframework.org/schema/context

        http://HdhCmsTestspringframework.org/schema/context/spring-context.xsd

        http://HdhCmsTestspringframework.org/schema/mvc

        http://HdhCmsTestspringframework.org/schema/mvc/spring-mvc.xsd">

     <!--自动扫描包-->

     <!-- 开启ioc   注解事务支持-->

     < context:component-scan base-package = "cn" ></ context:component-scan >

     <!--开启spiring mvc注解支持-->

     < mvc:annotation-driven ></ mvc:annotation-driven >

     <!--配置spring 中的视图解析器-->

     < bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver" id = "resolver" >

         < property name = "prefix" value = "/" ></ property >

         < property name = "suffix" value = ".jsp" ></ property >

     </ bean >

     < mvc:interceptors >

                 < bean id = "interceptor1" class = "cn.hp.interceptor.TestInterceptor1" ></ bean >

         < mvc:interceptor >

             < mvc:mapping path = "/**" />

             < bean id = "interceptor1" class = "cn.hp.interceptor.TestInterceptor1" ></ bean >

         </ mvc:interceptor >

         < mvc:interceptor >

             < mvc:mapping path = "/test1.do" />

             < mvc:exclude-mapping path = "/test2.do" />

             < bean id = "interceptor2" class = "cn.hp.interceptor.TestInterceptor2" ></ bean >

         </ mvc:interceptor >

</ beans >

package cn.hp.action;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@Controller

public class UserAction {

     @RequestMapping ( "/test1.do" )

     public   String test01(){

         System.out.println( "正在执行test1这个业务逻辑" );

         return "index" ;

     }

     @RequestMapping ( "/test2.do" )

     public   String test02(){

         System.out.println( "正在执行test2这个业务逻辑" );

         return "index" ;

     }

}

package cn.hp.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class TestInterceptor1 implements HandlerInterceptor {

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

         System.out.println( "第一个拦截器，执行业务逻辑之前执行此方法" );

         return true ;

     }

     @Override

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

         System.out.println( "第一个拦截器，执行业务逻辑之后，视图渲染之前执行此方法" );

     }

     @Override

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

         System.out.println( "第一个拦截器，执行视图渲染之后执行此方法" );

     }

}

package cn.hp.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class TestInterceptor2 implements HandlerInterceptor {

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

         System.out.println( "第二个拦截器，执行业务逻辑之前执行此方法" );

         return true ;

     }

     @Override

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

         System.out.println( "第二个拦截器，执行业务逻辑之后，视图渲染之前执行此方法" );

     }

     @Override

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

         System.out.println( "第二个拦截器，执行视图渲染之后执行此方法" );

     }

}