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.AfterRetuing;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");	retu 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");	retu "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.xsd	http://www.springframework.org/schema/aop 	http://www.springframework.org/schema/aop/spring-aop-4.0.xsd	http://www.springframework.org/schema/context	http://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-retuing method="log"				pointcut="execution(* net.csdn.www.dao.*.*(..))" retuing="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);	retu "好吃";}

MyAspect1.java

package net.csdn.www.aop;import java.util.Date;import org.aspectj.lang.annotation.AfterRetuing;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-retuing method="log"				pointcut="execution(* net.csdn.www.dao.*.*(..))" retuing="rvt" />			<aop:around method="processTx" pointcut="execution(* net.csdn.www.dao.*.*(..))" />		</aop:aspect>		 <aop:aspect id="asp2" ref="myAspect1" order="1">			<aop:after-retuing method="access"				pointcut="execution(* net.csdn.www.dao.*.*(..)) and args(date,food)"				retuing="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.xsd	http://www.springframework.org/schema/aop 	http://www.springframework.org/schema/aop/spring-aop-4.0.xsd	http://www.springframework.org/schema/context	http://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-retuing method="access" 			pointcut-ref="xxx" retuing="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-retuing method="log"				pointcut="execution(* net.csdn.www.dao.*.*(..))" retuing="rvt" />			<aop:around method="processTx" pointcut="execution(* net.csdn.www.dao.*.*(..))" />		</aop:aspect>	</aop:config></beans>