😉😉 学习交流群：

✅✅1：这是孙哥suns给大家的福利！

✨✨2：我们免费分享Netty、Dubbo、k8s、Mybatis、Spring...应用和源码级别的视频资料

🥭🥭3：QQ群：583783824   📚📚  工作微信：BigTreeJava 拉你进微信群，免费领取！

🍎🍎4：本文章内容出自上述：Spring应用课程！💞💞

💞💞5：以上内容，进群免费领取呦~ 💞💞💞💞

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 {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        InvocationHandler handler = new InvocationHandler() {
            @Override
            public 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>