基于API 的spring aop(XML Schema)

1、接口类

package cn.com.gan.spring.aop;

public interface IHello {
public void SayHello();
public void sayHelloAgain();
}

2、实现类

package cn.com.gan.spring.aop;

public class ImpHello implements IHello {

	@Override
	public void SayHello() {
    System.out.println("hello everybody！");
	}
	@Override
   public void sayHelloAgain(){
	   System.out.println("hello everybody again");
   }
}

3、advice ，方法名不限，JoinPoint可有可无。ProceedingJoinPoint 必须有 而且必须有返回值

package cn.com.gan.spring.aop;

package cn.com.gan.spring.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;

public class XmlLoggerBefore {
	public void before(JoinPoint jointPoint) {
		System.out.println("开始记录："
				+ jointPoint.getSignature().getDeclaringTypeName() + "."
				+ jointPoint.getSignature().getName());
	}
	
	public void after(JoinPoint jointPoint) {
		System.out.println("记录结束："
				+ jointPoint.getSignature().getDeclaringTypeName() + "."
				+ jointPoint.getSignature().getName());
	}
	public Object around(ProceedingJoinPoint pjp) throws Throwable{
		System.out.println("around开始记录："
				+ pjp.getSignature().getDeclaringTypeName() + "."
				+ pjp.getSignature().getName());
		Object rtv=pjp.proceed();
		System.out.println("around开始记录记录结束："
				+ pjp.getSignature().getDeclaringTypeName() + "."
				+ pjp.getSignature().getName());
		return rtv;
	}
}

3、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"
	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 ">
	<bean id="hello" class="cn.com.gan.spring.aop.ImpHello"></bean>
	<bean id="before" class="cn.com.gan.spring.aop.XmlLoggerBefore"></bean>
	<aop:config>
		<aop:aspect id="loggerbefore" ref="before">
			<aop:before pointcut="execution(* cn.com.gan.spring.aop.IHello.*(..))"
				method="before"/>
		</aop:aspect>
	</aop:config>
</beans>

或者pointcut重复利用。pointcut包括表达式和签名两部分。其中execution（表达式）格式为execution(modifiers-pattern? ret-type-pattern declaring-type-pattern?name-pattern(param-pattern) throws-pattern? )。其中参数中(*)表示一个参数，类型为任务，(..)表示零到多个参数。..表示子包

	<?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"
		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 ">
		<bean id="hello" class="cn.com.gan.spring.aop.ImpHello"></bean>
		<bean id="before" class="cn.com.gan.spring.aop.XmlLoggerBefore"></bean>
		<aop:config>
			<aop:aspect id="loggerbefore" ref="before">
				<aop:pointcut id="beforHello"
					expression="execution( * cn.com.gan.spring.aop.IHello.*(..))" />
				<aop:before pointcut-ref="beforHello" method="before" />
				<aop:after-returning pointcut-ref="beforHello" method="after" />
				<aop:around pointcut-ref="beforHello" method="around"/>
			</aop:aspect>
		</aop:config>
	</beans>

如果pointcunt元素定义为cn.com.gan.spring.aop.Hello.*(..))，应该是么有相应的类和方法被代理，但是为什么会报错。测试了下 方法名可以不存在 但是如果相应的类不存在的话会报错。