Spring基于advisor配置aop过程解析

package com.gec.target;

public class Hadoop { 
  public void eatting() {
    System.out.println("大象正在吃东西 1"); 
    try {
      //耗时5秒 
      Thread.sleep(5000); 
    } catch (InterruptedException e) { 
      e.printStackTrace(); 
    } 
  }
}

package com.gec.advice; 

import org.springframework.aop.MethodBeforeAdvice; 
import java.lang.reflect.Method; 

public class BeforeMethodAdvice implements MethodBeforeAdvice { 
  @Override
	public void before(Method method, Object[] objects, Object o) throws Throwable { 
    System.out.println("how are you"); 
  } 
}

<?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:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd                          http://www.springframework.org/schema/util                                     http://www.springframework.org/schema/util/spring-util-4.3.xsd             http://www.springframework.org/schema/context                                    http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop                                    http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
<aop:aspectj-autoproxy /> 
  <bean id="beforeMethodAdvice" class="com.gec.advice.BeforeMethodAdvice" /> 
  <bean id="hadoop" class="com.gec.target.Hadoop" /> 
  <aop:config> 
    <!--定义一个切面--> 
    <aop:advisor advice-ref="beforeMethodAdvice" pointcut="execution (* eatting(..))" /> 
  </aop:config> 
</beans>

public static void main(String[] args) { 
  ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml"); 
  Hadoop hadoop= (Hadoop) ctx.getBean("hadoop"); 
  hadoop.eatting(); 
}