一、什么是AOP
AOP(Aspect Oriented Programming)面向切面編程不同于OOP(Object Oriented Programming)面向對象編程,AOP是將程序的運行看成一個流程切面,其中可以在切面中的點嵌入程序。
舉個例子,有一個People類,也有一個Servant仆人類,在People吃飯之前,Servant會準備飯,在People吃完飯之后,Servant會進行打掃,這就是典型的面向切面編程.
其流程圖為:
二、Spring AOP實現:
1、People類:
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public class People { public void eat() { System.out.println(“happyheng開始吃飯啦"); } public void play(){ } } |
Servant類:
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@Aspect public class Servant { /** * 在吃飯之前 */ @Before ( "execution(** com.happyheng.entity.People.eat(..))" ) public void prepareFood(){ System.out.println( "準備食物" ); } /** * 在吃飯之后 */ @After ( "execution(** com.happyheng.entity.People.eat(..))" ) public void clean(){ System.out.println( "打掃" ); } } |
其中的 @Before是指執行前,@After是指執行方法后獲取方法拋出異常后,@AfterReturning是指在執行方法后調用,@AfterThrowing是指方法拋出異常后調用。
2、在applicationContext.xml中進行配置:
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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必須在Spring中注冊,否則不會生效,Spring會用這個bean進行攔截--> < 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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原文鏈接:http://blog.csdn.net/happyheng/article/details/53027484