AOP3

spring对AOP的支持

Aspect默认情况下不用实现接口，但对于目标对象（UserManagerImpl.java），在默认情况下必须实现接口
如果没有实现接口必须引入CGLIB库

我们可以通过Advice中添加一个JoinPoint参数，这个值会由spring自动传入，从JoinPoint中可以取得
参数值、方法名等等



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:tx="http://www.springframework.org/schema/tx"
	    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
	
	<bean id="securityHandler" class="com.bjsxt.spring.SecurityHandler"/>           
	
	<bean id="userManager" class="com.bjsxt.spring.UserManagerImpl"/>
	
	<aop:config>
		<aop:aspect id="security" ref="securityHandler">
			<aop:pointcut id="allAddMethod" expression="execution(* com.bjsxt.spring.UserManagerImpl.add*(..))"/>
			<aop:before method="checkSecurity" pointcut-ref="allAddMethod"/>
		</aop:aspect>
	</aop:config>	
</beans>

SecurityHandler.java

package com.bjsxt.spring;

import org.aspectj.lang.JoinPoint;

public class SecurityHandler {
	
	private void checkSecurity(JoinPoint joinPoint) {
		Object[] args = joinPoint.getArgs();
		for (int i=0; i<args.length; i++) {
			System.out.println(args[i]);
		}
		
		System.out.println(joinPoint.getSignature().getName());
		System.out.println("----------checkSecurity()---------------");
	}
	
}