advice的五种类型

通知的5种类型：执行顺序：相同类型已配置顺序为准
1.before：<aop:before method="before" pointcut-ref="pt"/>
2.after：<aop:after method="after" pointcut-ref="pt"/> 
3.afterReturning：返回后加入，有异常不执行<aop:after-returning method="afterReturning" pointcut-ref="pt"/>
4.afterThrowing：有异常才会执行<aop:after-throwing method="afterThrowing" pointcut-ref="pt"/>
5.round：<aop:around method="round" pointcut-ref="pt"/>
用法最广泛，可替代before，after，调用目标方法
public void round(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("round before");
pjp.proceed();
System.out.println("round after");

}

代码实现：

    1.目标对象：

    

	public void save() {
		//int i = 1/0;
		System.out.println("save.....");
	}
}

    2.通知：

    

public class MyTarget2 {

public class MyAdvice2 {
	public void before() {
		System.out.println("before");
	}
	public void after() {
		System.out.println("after");
	}
	public void afterReturning() {
		System.out.println("afterReturning");
	}
	public void afterThrowing() {
		System.out.println("afterThrowing");
	}
	public void round(ProceedingJoinPoint pjp) throws Throwable {
		System.out.println("round before");
		pjp.proceed();
		System.out.println("round after");
	}
}

    3.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:util="http://www.springframework.org/schema/util"
       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/util
	   http://www.springframework.org/schema/util/spring-util.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">
		
	<!--spring管理资源都是bean的形式  -->
	<!-- 你的资源是那个类的对象 
		<bean class="类名" id="类名对应的唯一标识"></bean>
	-->
	<!--配置aop，切入点与通知之间的关系   _切面 -->
	<!--aop:config：配置aop  -->
	<aop:config>
		<aop:pointcut expression="execution(void com.array.aop.adviceType.MyTarget2.save())" id="pt"/>
		<aop:aspect ref="myAdvice2">
			<!--配置aop的通知类别  
				aop:before method="" 通知类别的具体通知
				aop:before pointcut=""切入点
				<aop:before method="fn1" pointcut="执行到save方法时"/>
				
		 -->
		 	<!-- 在方法save的前面加入方法fn -->
			<!-- <aop:before method="before" pointcut-ref="pt"/>
			<aop:after method="after" pointcut-ref="pt"/> -->
			<!-- <aop:after-returning method="afterReturning" pointcut-ref="pt"/> -->
			<aop:around method="round" pointcut-ref="pt"/>
			<aop:after-throwing method="afterThrowing" pointcut-ref="pt"/>
		</aop:aspect>
	</aop:config>
	<!--/将目标对象与通知定义为bean  -->
	<bean id="myAdvice2" class="com.array.aop.adviceType.MyAdvice2"></bean>
	<bean id="myTarget2" class="com.array.aop.adviceType.MyTarget2"></bean>
</beans>