一、什么是AOP
AOP(Aspect Oriented Programming)面向切面编程不同于OOP(Object Oriented Programming)面向对象编程,AOP是将程序的运行看成一个流程切面,其中可以在切面中的点嵌入程序。
举个例子,有一个People类,也有一个Servant仆人类,在People吃饭之前,Servant会准备饭,在People吃完饭之后,Servant会进行打扫,这就是典型的面向切面编程.
其流程图为:
二、Spring AOP实现:
1、People类:
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public class People { public void eat() { System.out.println(“happyheng开始吃饭啦"); } public void play(){ } } |
Servant类:
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@Aspect public class Servant { /** * 在吃饭之前 */ @Before ( "execution(** com.happyheng.entity.People.eat(..))" ) public void prepareFood(){ System.out.println( "准备食物" ); } /** * 在吃饭之后 */ @After ( "execution(** com.happyheng.entity.People.eat(..))" ) public void clean(){ System.out.println( "打扫" ); } } |
其中的 @Before是指执行前,@After是指执行方法后获取方法抛出异常后,@AfterReturning是指在执行方法后调用,@AfterThrowing是指方法抛出异常后调用。
2、在applicationContext.xml中进行配置:
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<? 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-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" xmlns:context = "http://www.springframework.org/schema/context" > < context:component-scan base-package = "com.happyheng" /> < aop:aspectj-autoproxy /> <!--注意Aspect的bean必须在Spring中注册,否则不会生效,Spring会用这个bean进行拦截--> < bean class = "com.happyheng.aop.Servant" ></ bean > < bean id = "happyheng" class = "com.happyheng.entity.People" ></ bean > </ beans > |
3、在main中使用:
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public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext(APPLICATION_XML); People happyheng = (People)ctx.getBean( "happyheng" ); happyheng.eat(); } |
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原文链接:http://blog.csdn.net/happyheng/article/details/53027484