spring-aop 配置文件方式实现

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切面类Aop.java

package cn.itcast.f_aop_xml;import org.aspectj.lang.ProceedingJoinPoint;// 切面类public class Aop {public void begin(){System.out.println("开始事务/异常");}public void after(){System.out.println("提交事务/关闭");}public void afterReturning() {System.out.println("afterReturning()");}public void afterThrowing(){System.out.println("afterThrowing()");}public void around(ProceedingJoinPoint pjp) throws Throwable{System.out.println("环绕前....");pjp.proceed();  // 执行目标方法System.out.println("环绕后....");}}

bean.xml

<?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:p="http://www.springframework.org/schema/p"    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.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd        http://www.springframework.org/schema/aop        http://www.springframework.org/schema/aop/spring-aop.xsd"><!-- dao 实例 --><bean id="userDao" class="cn.itcast.f_aop_xml.UserDao"></bean><bean id="orderDao" class="cn.itcast.f_aop_xml.OrderDao"></bean><!-- 切面类 --><bean id="aop" class="cn.itcast.f_aop_xml.Aop"></bean><!-- Aop配置 --><aop:config><!-- 定义一个切入点表达式： 拦截哪些方法 --><aop:pointcut expression="execution(* cn.itcast.f_aop_xml.*.*(..))" id="pt"/><!-- 切面 --><aop:aspect ref="aop"><!-- 环绕通知 --><aop:around method="around" pointcut-ref="pt"/><!-- 前置通知： 在目标方法调用前执行 --><aop:before method="begin" pointcut-ref="pt"/><!-- 后置通知： --><aop:after method="after" pointcut-ref="pt"/><!-- 返回后通知 --><aop:after-returning method="afterReturning" pointcut-ref="pt"/><!-- 异常通知 --><aop:after-throwing method="afterThrowing" pointcut-ref="pt"/></aop:aspect></aop:config></beans>

IUserDao.java

package cn.itcast.f_aop_xml;// 接口public interface IUserDao {void save();}

UserDao.java

package cn.itcast.f_aop_xml;/** * 目标对象 * @author Jie.Yuan * */public class UserDao implements IUserDao{@Overridepublic void save() {System.out.println("-----核心业务：保存！！！------"); }}

OrderDao.java

package cn.itcast.f_aop_xml;/** * 目标对象 * @author Jie.Yuan * */public class OrderDao{public void save() {System.out.println("-----核心业务：保存！！！------");}}

App.java

package cn.itcast.f_aop_xml;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class App {ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/f_aop_xml/bean.xml");// 目标对象有实现接口，spring会自动选择“JDK代理”@Testpublic void testApp() {IUserDao userDao = (IUserDao) ac.getBean("userDao");System.out.println(userDao.getClass());//$Proxy001  userDao.save();}// 目标对象没有实现接口， spring会用“cglib代理”@Testpublic void testCglib() {OrderDao orderDao = (OrderDao) ac.getBean("orderDao");System.out.println(orderDao.getClass());orderDao.save();}}

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