（一）开启自动配置

参考:
https://www.yuque.com/docs/share/9993e74c-db04-4d0f-8ab4-d32a30d9be4d?#


定期SpringBoot自动装配之后

ConfigurationClassParser#processImports 导入了AutoProxyRegistrar和ProxyTransactionManagementConfiguration

1．AutoProxyRegistrar作用

AutoProxyRegistrar作用注册InfrastructureAdvisorAutoProxyCreator到Spring容器里面,InfrastructureAdvisorAutoProxyCreator是AbstractAutoProxyCreator的子类，AbstractAutoProxyCreator又实现了BeanPostProcessor接口，那么在bean初始化完毕后就会调用postProcessAfterInstantiation()方法，postProcessAfterInstantiation()定义在AbstractAutoProxyCreator类中


每个bean实例化过程中都会走AbstractAutoProxyCreator的后置处理里面,如果存在advice,就会创建代理对象.

2．ProxyTransactionManagementConfiguration作用