Spring中的简单实现AOP小例子

先说一下相应的知识作铺垫

Spring 的 AOP 术语：

         1 ）连接点（ JointPoint ）：目标对象的每个方法

    2 ）切入点 (PontCut) ：切入了服务代码的连接点

    3 ）通知 (Advice) ：在切入点上面需要切入的服务代码

    4 ）切面 (Aspect/Advisor) ：在指定的切入点切入指定的通知形成切面

1、导入所需的jar包

      Spring的IOC和AOP包

2、创建dao类

package star.july.d_spring_aop;

import org.aspectj.lang.ProceedingJoinPoint;

public class MyAspect {

           /**

           * 常用的通知类：

           *   前置通知： 在目标对象的连接点之前调用

           *   后置通知：在目标对象的连接点之后调用

           *   环绕通知： 在目标对象的连接点之前与之后调用

           */

          

           //定义前置通知

           public void before(){

                   System. out .println( "开启事务" );

          }

          

           //定义后置通知

           public void after(){

                   System. out .println( "结束事务" );

          }

          

           //环绕通知

           public void round(ProceedingJoinPoint jp) throws Throwable{

                   System. out .println( "环绕通知前面代码" );

                   

                    //执行目标对象的核心方法

                   jp.proceed(); //执行连接点方法

                   

                   System. out .println( "环绕通知后面代码" );

          }

          

          

}

3、创建切面类

package star.july.d_spring_aop;

public class MyAspect {

           /**

           * 常用的通知类：

           *   前置通知： 在目标对象的连接点之前调用

           *   后置通知：在目标对象的连接点之后调用

           *   环绕通知： 在目标对象的连接点之前与之后调用

           */

          

           //定义前置通知

           public void before(){

                   System. out .println( "开启事务" );

          }

}

4、配置

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.xsd

        http://www.springframework.org/schema/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd" >

          

           < bean id = "userDao" class = "star.july.d_spring_aop.UserDao" > bean >

          

          

           < bean id = "myaspect" class = "star.july.d_spring_aop.MyAspect" > bean >

          

          

           < aop:config >

                   

                    < aop:aspect ref = "myaspect" >

                             

                           

           < aop:pointcut expression = "execution(* star.july.d_spring_aop.UserDao.*(..))" id = "myspt" />

                   

                   

                     < aop:before method = "before" pointcut-ref = "myspt" />

                     < aop:after method = "after" pointcut-ref = "myspt" />

                     < aop:around method = "round" pointcut-ref = "myspt" />

                     aop:aspect >

aop:config >       

       

beans >

5、测试

package star . july . d_spring_aop ;

import org . springframework . context . ApplicationContext ;

import org . springframework . context . support . ClassPathXmlApplicationContext ;

public class Demo {

     public static void main ( String [] args ) {

        ApplicationContext ac = new ClassPathXmlApplicationContext ( "/applicationContext.xml" );

        UserDao userDao = ( UserDao ) ac . getBean ( "userDao" );

        userDao . save ();

        userDao . update ();

     }

}