Spring Aop

   这几天在看Spring Aop的东西，做了一个简单的小例子：

 

 

 

public interface IHello {
	
	public String hello(String name) ;

}

public class HelloSpeaker implements IHello {

	public String hello(String name) {
		
		String hello = " Hello " + name ;
		
		System.out.println( hello );
		
		return hello ;
	}

}

   上面的是接口和实现类，也就是需要被AOP处理的类，也就是Target.


    下面这个类，是AOP中Aspect，切入类，我采用的是，afterReturn类型
   
     
public class AfterReturnExample {
	
	public void profile( Object retVal ) {
		
		
		System.out.println(" the result " + retVal );
		
		System.out.println(" after return ");
		
	}

} 

下面是spring的配置文件：

<?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:aop="http://www.springframework.org/schema/aop"
	     xmlns:tx="http://www.springframework.org/schema/tx"
	     xmlns:p="http://www.springframework.org/schema/p"
	     xsi:schemaLocation=
	       "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
           
	
	<aop:config>
		<aop:aspect id="beforeExample" ref="afterReturnExample">
			<aop:after-returning pointcut="execution(* com.ultrapower.demo.aop.*.*(..))" method="profile" returning="retVal"/>
		</aop:aspect>
	</aop:config>
	
	<bean id="hello" class="com.ultrapower.demo.aop.HelloSpeaker"></bean>
	
	<bean id="afterReturnExample" class="com.ultrapower.demo.aop.before.AfterReturnExample"></bean>
	
</beans> 


下面是测试类：

public class Test {
	
	
	public static void main(String [] args) {
		
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("aop/applicationContext.xml");
		
		IHello hello = (IHello) context.getBean("hello");
		
		hello.hello("zzx") ;
		
	}
	

}



    刚刚开始的时候出现了一个错误：
- Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1808199: defining beans 
[org.springframework.aop.config.internalAutoProxyCreator,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,hello,
afterReturnExample]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.s
pringframework.aop.aspectj.AspectJPointcutAdvisor#0': Instantiation of bean failed; nested exception is org.springframew
ork.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.aop.aspectj.AspectJPointcutA
dvisor]: Constructor threw exception; nested exception is java.lang.IllegalArgumentException: warning no match for this 
type name: com.ultrapower.demo.aop [Xlint:invalidAbsoluteTypeName]


这个错误主要是 pointcut配置的错误，修改之后就可以了：pointcut="execution(* com.ultrapower.demo.aop.*.*(..))"