Spring AOP demo 和获取被CGLIB代理的对象

本文分为两部分：1）给出SPRing AOP的一个例子（会使用CGLIB代理）；2）给出获取被CGLIB代理的原始对象。

1、Spring AOP Demo

这部分参考了博文（http://www.voidcn.com/blog/daguanjia11/article/p-4628090.html）

1.1添加maven依赖

<dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-core</artifactId>    <version>4.0.5.RELEASE</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-beans</artifactId>    <version>4.0.5.RELEASE</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-context</artifactId>    <version>4.0.5.RELEASE</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-aop</artifactId>    <version>4.0.5.RELEASE</version></dependency><dependency>    <groupId>org.aspectj</groupId>    <artifactId>aspectjweaver</artifactId>    <version>1.8.1</version></dependency>
1.2添加测试类
public class SpringAopTest {    public static class Car {        public void go() {            System.out.println("go go go!");        }    }    public static class CarLogger {        public void beforeRun() {            System.out.println("car is going to run");        }        public void afterRun() {            System.out.println("car is running");        }    }    public static void main(String[] args) {        applicationContext context = new ClassPathxmlApplicationContext("spring-aop-test.xml");        Car car = (Car) context.getBean("car");        System.out.println(car.getClass());        car.go();    }}
1.3添加spring配置文件
放置在classpath的根目录下，额，放在resources目录下也就行了。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">    <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:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd" >        <bean id="car" class="com.SpringAopTest.Car"/>        <bean id="logger" class="com.SpringAopTest.CarLogger" />        <aop:config>            <aop:aspect ref="logger">                <aop:pointcut expression="execution(* com.SpringAopTest.Car.go(..))" id="go"/>                <aop:before pointcut-ref="go" method="beforeRun" />                <aop:after pointcut-ref="go" method="afterRun" />            </aop:aspect>        </aop:config>    </beans></beans>1.4运行main函数
得到如下结果：
car is going to rungo go go!car is running
呐，你看go go go!前后都有后添加的动作吧。
2、获取被CGLIB代理的对象
这部分内容参考了博文（http://blog.csdn.net/liufeng520/article/details/43563161）
我们先通过debug看一下被代理对象被藏在哪里了
好，看完了，我们来写一下代码，如下：
import java.lang.reflect.Field;import org.springframework.aop.framework.AdvisedSupport;import org.springframework.aop.support.AopUtils;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * Created by qm on 17/2/15. */public class SpringAopTest {    public static class Car {        public void go() {            System.out.println("go go go!");        }    }    public static class CarLogger {        public void beforeRun() {            System.out.println("car is going to run");        }        public void afterRun() {            System.out.println("car is running");        }    }    public static Object getTarget(Object beanInstance) {        if (!AopUtils.isAopProxy(beanInstance)) {            return beanInstance;        } else if (AopUtils.isCglibProxy(beanInstance)) {            try {                Field h = beanInstance.getClass().getDeclaredField("CGLIB$CALLBACK_0");                h.setaccessible(true);                Object dynamicAdvisedInterceptor = h.get(beanInstance);                Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");                advised.setAccessible(true);                Object target = ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();                return target;            } catch (NoSuchFieldException e) {                e.printStackTrace();            } catch (IllegalAccessException e) {                e.printStackTrace();            } catch (Exception e) {                e.printStackTrace();            }        }        return null;    }    public static void main(String[] args) {        ApplicationContext context = new ClassPathXmlApplicationContext("spring-aop-test.xml");        Car car = (Car) context.getBean("car");        Object target = getTarget(car);        System.out.println(target == car);        System.out.println(car.getClass());        System.out.println(target.getClass());        car.go();    }}