【转载】spring中bean的循环依赖已经解决方式

https://blog.csdn.net/u010853261/article/details/77940767
这篇文章讲解的十分清楚

Spring开闭原则的表现-BeanPostProcessor的扩展点
http://jinnianshilongnian.iteye.com/blog/1489787