Spring AOP

Spring AOP支持5种类型的增强【通知】，分别是：前置增强，后置增强，环绕增强，异常抛出增强，引介增强

以下是前置增强的一个示例：

1、PeopleDao

package com.twj.advisor;

public interface PeopleDao {

	public void eating(String name);
}

2、PeopleDaoImpl

package com.twj.advisor;

public class PeopleDaoImpl implements PeopleDao{
	public void eating(String name){
		System.out.println(name+"is Eating");
	}
}

3、BeforeAdvice

package com.twj.advisor;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class Peopleabeforedvisor implements MethodBeforeAdvice {

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2)
			throws Throwable {
		// TODO Auto-generated method stub
		String methodname=arg0.getName();
		String peoplename=(String) arg1[0];
		System.out.println(methodname+" run");

		System.out.println(peoplename+"在洗手准备去吃饭啦");
	}

}

4、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:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	<bean id="peopleabeforedvisor" class="com.twj.advisor.Peopleabeforedvisor"></bean>
	<bean id="target" class="com.twj.advisor.PeopleDaoImpl"></bean>
	<bean id="people" class="org.springframework.aop.framework.ProxyFactoryBean"
		p:proxyInterfaces="com.twj.advisor.PeopleDao" p:interceptorNames="peopleabeforedvisor"
		p:target-ref="target" />
</beans>

5、测试

package com.twj.advisor;

import org.springframework.aop.BeforeAdvice;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBeforeAdvisor {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub 

		String config="/applicationContext.xml";
		ApplicationContext ctx=new ClassPathXmlApplicationContext(config);
		
		 PeopleDao p=(PeopleDao) ctx.getBean("people");

		 p.eating("Xiaoming");
	}

}

6、测试结果：