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一：Spring工厂对于代理的加工

        动态代理是通过spring工厂创建并获取代理对象的，这就解释了spring如何是将通过id的值获取的事代理的对象。我们直接看代码

package com.spring.factory;import com.spring.proxy.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;/*** @Auther: DaShu* @Date: 2021/6/28 21:34* @Description:*/
public class Test {public static void main(String[] args) {ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext2.xml");UserService userService = (UserService)ctx.getBean("userService");userService.login("suns","liming");userService.register(new User());//------------new Log()----------------//UserServiceImpl.login//------------new Log()----------------//UserServiceImpl.register}
}

package com.spring.factory;import com.spring.annotation.Log;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** @Auther: DaShu* @Date: 2021/6/28 21:24* @Description:*/
public class ProxyBeanPostProcessor implements BeanPostProcessor {@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {return bean;}@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {InvocationHandler handler = new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {System.out.println("------------new Log()----------------");Object invoke = method.invoke(bean, args);return invoke;}};//这样返回的已经不再是原始对象而是，加工之后产生的代理对象。return Proxy.newProxyInstance(ProxyBeanPostProcessor.class.getClassLoader(),bean.getClass().getInterfaces(),handler);}
}

<?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:util="http://www.springframework.org/schema/util"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.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd"><bean id="userService" class = "com.spring.factory.UserServiceImpl"/><bean id = "proxyBeanPostProcessor" class = "com.spring.factory.ProxyBeanPostProcessor"/>
</beans>