spring mvc系列文章 - 拦截器篇

今天给项目加个拦截器，结合之前的系列文章，这里给出两个需要新增的文件。

1 interceptor.java

package com.springmvc.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;/** * 拦截器 *  * @author jiaojun * */public class StudentInterceptor implements HandlerInterceptor {/**       * 在Controller方法后进行拦截       * 当有拦截器抛出异常时,会从当前拦截器往回执行所有拦截器的afterCompletion方法       */  @Overridepublic void afterCompletion(HttpServletRequest arg0,HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {arg0.setAttribute("end", "终于毕业了");System.out.println("终于毕业了!");}/** * 当Controller执行完毕，Interceptor会调用postHandle来做后置处理 */@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2, ModelAndView arg3) throws Exception {System.out.println("饱经沧桑，苦读诗书！");}/**       * 在Controller方法前进行拦截       * 如果返回false       *      从当前拦截器往回执行所有拦截器的afterCompletion方法,再退出拦截器链.       * 如果返回true       *      执行下一个拦截器,直到所有拦截器都执行完毕.       *      再运行被拦截的Controller.       *      然后进入拦截器链,从最后一个拦截器往回运行所有拦截器的postHandle方法.       *      接着依旧是从最后一个拦截器往回执行所有拦截器的afterCompletion方法.       */  @Overridepublic boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2) throws Exception {arg0.setAttribute("start", "入学登记开始");System.out.println("入学登记开始");return true;}}

2 interceptor 配置文件

<?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:aop="http://www.springframework.org/schema/aop"        xmlns:tx="http://www.springframework.org/schema/tx"         xmlns:jdbc="http://www.springframework.org/schema/jdbc"         xmlns:context="http://www.springframework.org/schema/context"  xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"        default-autowire="byName">    <!-- 引入配置文件    <bean id="propertyConfigurer"class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="location"><value>classpath:mysql.properties</value></property></bean>--><!--创建jdbc数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/test"/>  <property name="username" value="root"/><property name="password" value="jiaojun"/>  </bean>  <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  <property name="dataSource" ref="dataSource" />  </bean>      <!-- 创建SqlSessionFactory，同时指定数据源 -->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  <property name="configLocation" value="classpath:mybatis-config.xml" /> <property name="dataSource" ref="dataSource" />  </bean>      <!--以注解方式扫描Spring Bean --> <context:annotation-config /> <!--配置扫描SpringBean的时候 都需要扫描哪些目录下 --> <context:component-scan base-package="com.springmvc"></context:component-scan>     <!-- 可通过注解控制事务 -->  <tx:annotation-driven />  <!-- Mapper接口所在包名，Spring会自动查找其下的Mapper -->  <!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  <property name="basePackage" value="com.springmvc.dao" />  </bean>     -->        <bean id="studentMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">          <property name="mapperInterface" value="com.springmvc.dao.StudentMapper"/>          <property name="sqlSessionFactory" ref="sqlSessionFactory"/>            </bean>        <!-- jsp视图配置 -->              <!--   <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">  <property name="prefix" value="/"/>  <property name="suffix" value=".jsp"/>  </bean>  -->     <!-- freemarker视图解析配置 --><bean id="viewResolver"class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"><property name="cache" value="true" /><property name="prefix" value="" /><property name="suffix" value=".ftl" /><property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" /><property name="contentType" value="text/html;charset=UTF-8"></property><property name="requestContextAttribute" value="request" /><property name="exposeSpringMacroHelpers" value="true" /><property name="exposeRequestAttributes" value="true" /><property name="exposeSessionAttributes" value="true" /></bean>        <!-- freemark初始化配置项 --><bean id="freemarkerConfig"class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"><property name="templateLoaderPath" value="/WEB-INF/template/" /><property name="freemarkerSettings"><props><!-- 如果模板不经常更新，此属性设置更新延迟时间 --><prop key="template_update_delay">60</prop><prop key="default_encoding">UTF-8</prop><prop key="number_format">#.###</prop><prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop><prop key="classic_compatible">true</prop><prop key="template_exception_handler">ignore</prop></props></property></bean><!-- 拦截器配置项 --><mvc:interceptors>         <mvc:interceptor>             <mvc:mapping path="/**"/>             <bean class="com.springmvc.interceptor.StudentInterceptor" />         </mvc:interceptor>         <!--        .................       1.拦截器按照先后顺序进行拦截；   2.拦截全部请求时使用"/**";       3.拦截只针对controller.       -->    </mvc:interceptors>      </beans>  

package com.springmvc.action;import java.util.List;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.springmvc.domain.Student;import com.springmvc.service.StudentService;@Controller//@RequestMapping(value ="/") public class StudentController {  @Resource(name = "studentService")     private StudentService studentService;    @RequestMapping(value = "/studentController.do")     public String getStudent(HttpServletRequest request,              HttpServletResponse response) throws Exception {          Student student = studentService.queryStudentById(12);         student.setId(12);        student.setName("wodeguiguai");        //studentService.addStudent(student);               // studentService.delStudent(1);                student.setName("haohaoxiansheng");        studentService.updateStudent(student);                        request.setAttribute("student", student);                System.out.println("考试，检验你的时刻到了！");        return "test";      }  } 

输出结果：

入学登记开始
考试，检验你的时刻到了！
饱经沧桑，苦读诗书！
终于毕业了!

源码下载地址：http://download.csdn.net/detail/sl0007/4496354