<七>AOP面向切面——配置bean.xml文件方式声明切面(附源码)

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上一节为注解方式声明切面，现在通过配置bean.xml文件的形式来配置。

1、将上面的MyInterceptor变成一个普通的java类，即去掉@Aspect这样的注解。并将参数去掉。

package cn.itcast.service;import org.aspectj.lang.ProceedingJoinPoint;/** * 切面 * */public class MyInterceptor {public void doAccessCheck() {System.out.println("前置通知:");}public void doAfterReturning(){System.out.println("后置通知");}public void doAfter(){System.out.println("最终通知");}public void doAfterThrowing(){System.out.println("例外通知");}public Object doBasicProfilling(ProceedingJoinPoint pjp) throws Throwable{System.out.println("进入方法");Object result=pjp.proceed();System.out.println("退出方法");return result;}}

2、beans.xml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:context="http://www.springframework.org/schema/context"        xmlns:aop="http://www.springframework.org/schema/aop"             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/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">        <aop:aspectj-autoproxy/>        <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"/>       <bean id="aspectbean" class="cn.itcast.service.MyInterceptor"/>       <aop:config>       <aop:aspect id="asp" ref="aspectbean">       <aop:pointcut id="mycut"       expression="execution(* cn.itcast.service.impl.PersonServiceBean.*(..))" />       <aop:before pointcut-ref="mycut" method="doAccessCheck" />       <aop:after-returning pointcut-ref="mycut" method="doAfterReturning"/>  <aop:after-throwing pointcut-ref="mycut" method="doAfterThrowing"/>  <aop:after pointcut-ref="mycut" method="doAfter"/>  <aop:around pointcut-ref="mycut" method="doBasicProfilling"/>       </aop:aspect>       </aop:config></beans>

说明：

<aop:pointcut id="mycut" expression="execution(java.lang.String cn.itcast.service.impl.PersonServiceBean.*(..))" />将会只拦截cn.itcast.service.impl.PersonServiceBean类中的返回值为string类型的方法<aop:pointcut id="mycut" expression="execution(* cn.itcast.service.impl.PersonServiceBean.*(java.lang.String,..))" />将会只拦截cn.itcast.service.impl.PersonServiceBean类中的参数有string类型的方法<aop:pointcut id="mycut" expression="execution(!void cn.itcast.service.impl.PersonServiceBean.*(..))" />将会只拦截cn.itcast.service.impl.PersonServiceBean类中的返回值不为空的方法spring发现前面定义的切口的类有实现接口，则用jdk的创建代理技术进行创建代理对象；如果没有实现接口，则用CGlib来创建代理对象

3、测试SpringAOPTest.java

package junit.test;import org.junit.BeforeClass;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import cn.itcast.service.PersonService;public class SpringAOPTest {@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@Test public void interceptorTest(){ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");PersonService personService = (PersonService)cxt.getBean("personService");personService.save("chen");personService.getPersonName(3);//personService.update("ning", 4);}}

完成。

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