手动实现Aop

2019-11-06 07:43:42

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来源：转载

供稿：网友

目标接口

package com.pactera.dao;public interface IUserDao { void save();}

目标类

package com.pactera.daoImpl;import org.sPRingframework.stereotype.Repository;import com.pactera.dao.IUserDao;@Repositorypublic class UserDao implements IUserDao{ @Override public void save() { System.out.println("userDao save()"); }}

代理对象工厂类

package com.pactera.proxy;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;import com.pactera.transaction.Aop;//jdk动态代理public class ProxyFactory{ /** * 根据传入的目标对象生成代理对象 * @param obj 目标对象 * @param aop 事务处理类 * @return */ public Object createProxyInstance(final Object target,final Aop aop){ return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), new InvocationHandler() { @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { aop.before(); Object methodReturnValue = method.invoke(target, args); aop.after(); return methodReturnValue; } }); }}

事务类

package com.pactera.transaction;import org.springframework.stereotype.Component;@Componentpublic class Aop { public void before(){ System.out.println("---模拟事务开启---"); } public void after(){ System.out.println("---模拟事务关闭---"); }}

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" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation= "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">  <context:component-scan base-package="com.pactera"></context:component-scan>  <bean id="proxyFactory" class="com.pactera.proxy.ProxyFactory"></bean> <bean id="userDaoProxy" factory-bean="proxyFactory" factory-method="createProxyInstance"> <constructor-arg ref="userDao"></constructor-arg> <constructor-arg ref="aop"></constructor-arg> </bean></beans>

测试

package com.pactera.springBeanTest;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.pactera.dao.IUserDao;public class TestSpringBean { @Test public void testIOC(){ ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDao userDao = ac.getBean("userDaoProxy", IUserDao.class); userDao.save(); }}

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