借助ImportBeanDefinitionRegistrar接口实现bean的动态注入
https://www.jianshu.com/p/2b993ced6a4c
ImportBeanDefinitionRegistrar动态注册bean
https://blog.csdn.net/jiachunchun/article/details/94569246
Spring(33)——ImportBeanDefinitionRegistrar介绍
https://m.wang1314.com/doc/webapp/topic/19939654.html
使用@import导入实现了ImportBeanDefinitionRegistrar接口的类,不能被注册为bean
https://www.cnblogs.com/zzq-include/p/8004506.html