springAOP基于XML配置文件方式

<aop:config.../>包含：poincut,advisor,aspect元素，通过XML配置。

springAOP的具体加载步骤：
   1、当spring容器启动的时候，加载了spring的配置文件
   2、为配置文件中所有的bean创建对象
   3、spring容器会解析aop:config的配置 
       1、解析切入点表达式，用切入点表达式和纳入spring容器中的bean做匹配
            如果匹配成功，则会为该bean创建代理对象，代理对象的方法=目标方法+通知
            如果匹配不成功，不会创建代理对象
   4、在客户端利用context.getBean获取对象时，如果该对象有代理对象则返回代理对象，如果代理对象，则返回目标对象


说明：如果目标类没有实现接口，则spring容器会采用cglib的方式产生代理对象，如果实现了接口，会采用jdk的方式

MyAspect.java

package net.csdn.www.aop;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.springframework.core.annotation.Order;public class MyAspect {public void authority(JoinPoint jp) {System.out.println("被代理方法名字："+jp.getSignature().getName());System.out.println("被代理方法参数："+jp.getArgs());System.out.println("被代理对象："+jp.getTarget());System.out.println("现在调用的是权限验证");          }public  void log(JoinPoint jp,Object rvt){System.out.println("被代理方法名字："+jp.getSignature().getName());System.out.println("被代理方法参数："+jp.getArgs());System.out.println("被代理对象："+jp.getTarget());System.out.println("被代理对象的返回值"+rvt);System.out.println("现在调用的是日志管理");}public Object processTx(ProceedingJoinPoint pjp) throws Throwable{System.out.println("现在调用的是事务开启");//得到业务方法的参数Object[] args=pjp.getArgs();System.out.println("业务方法的参数："+args);//被代理对象的业务方法Object result=pjp.proceed(args);System.out.println("现在调用的是事务提交或回滚");    return result;}public void release(){System.out.println("资源已经被释放！");}}

UserDao.java

package net.csdn.www.dao;import java.util.Date;import org.springframework.stereotype.Component;@Componentpublic class UserDao {    public String save(String name){    System.out.println(name+"被保存");    return "success";    }}

applicationContext.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:aop="http://www.springframework.org/schema/aop"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsd"><!-- 切面 --><bean id="myAspect" class="net.csdn.www.aop.MyAspect"></bean><bean id="userDao" class="net.csdn.www.dao.UserDao"></bean><!-- 切入点 --><aop:config><aop:aspect id="asp1" ref="myAspect"><aop:before method="authority" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after method="release" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after-returning method="log"pointcut="execution(* net.csdn.www.dao.*.*(..))" returning="rvt" /><aop:around method="processTx" pointcut="execution(* net.csdn.www.dao.*.*(..))" /></aop:aspect></aop:config></beans>

测试类Test.java

package net.csdn.www.text;import java.util.Date;import net.csdn.www.dao.UserDao;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {   public static void main(String[] args) {ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");UserDao  userDao=(UserDao) context.getBean("userDao");     userDao.save("csdnccccccc");   }}

在UserDao类中声明一个带参数的方法

public String eat(Date date,String food){    System.out.println(date+"先准备："+food);    return "好吃";    }

MyAspect1.java

package net.csdn.www.aop;import java.util.Date;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.springframework.core.annotation.Order;public class MyAspect1 {//注意：增加参数匹配，参数位置类型要和被代理方法一致     public void access(Date date, String food,Object rvt){     System.out.println(date+"吃"+food+"-----");     System.out.println("返回值为："+rvt);     }}

在XML文件中配置切面

<bean id="myAspect1" class="net.csdn.www.aop.MyAspect1"></bean><!-- 切入点 --><aop:config><aop:aspect id="asp1" ref="myAspect"><aop:before method="authority" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after method="release" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after-returning method="log"pointcut="execution(* net.csdn.www.dao.*.*(..))" returning="rvt" /><aop:around method="processTx" pointcut="execution(* net.csdn.www.dao.*.*(..))" /></aop:aspect> <aop:aspect id="asp2" ref="myAspect1" order="1"><aop:after-returning method="access"pointcut="execution(* net.csdn.www.dao.*.*(..)) and args(date,food)"returning="rvt" /></aop:aspect></aop:config>

调用userDao.eat(new Date(), "xiaochi");

设置切入点

<aop:pointcut expression="execution(* csdn.dao.*.*(..))" id="mypoint"/>
id 切入点的标示名
expression 切入点表达式
<aop:after method="release" pointcut-ref="mypoint"/>

把XML文件改成

<?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:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsd"><!-- 切面 --><bean id="myAspect" class="net.csdn.www.aop.MyAspect"></bean><bean id="userDao" class="net.csdn.www.dao.UserDao"></bean><bean id="myAspect1" class="net.csdn.www.aop.MyAspect1"></bean><!-- 切入点 --><aop:config>    <aop:pointcut expression="execution(* net.csdn.www.dao.*.*(..)) and args(date,food)" id="xxx"/> <aop:aspect ref="myAspect1"> <aop:after-returning method="access" pointcut-ref="xxx" returning="rvt"/> </aop:aspect>         <aop:aspect id="asp1" ref="myAspect" order="2"><aop:before method="authority" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after method="release" pointcut="execution(* net.csdn.www.dao.*.*(..))" /><aop:after-returning method="log"pointcut="execution(* net.csdn.www.dao.*.*(..))" returning="rvt" /><aop:around method="processTx" pointcut="execution(* net.csdn.www.dao.*.*(..))" /></aop:aspect></aop:config></beans>