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This article introduces you how to understand spring--BeanPostProcesstor, the content is very detailed, interested friends can use for reference, hope to be helpful to you.

BeanFactoryPostProcesstor and BeanPostProcessor are hook functions of spring and are extension points for spring's bean initialization to expose to the outside world.

BeanPostProcessor is an extension interface provided to us by the Spring IOC container.

As shown in the figure, we can see that BeanPostProcessor provides two interface callbacks. When the implementation class of BeanPostProcessor is registered in the spring ioc container, each bean instance created by the modified spring ioc container will call the postProcessBeforeInitialization method in BeanPostProcessor before calling its initialization method call, and after the initialization method call of the bean instance is completed, the postProcessAfterInitialization method in BeanPostProcessor will be called. The whole call sequence can be simply shown as follows:

You can see that spring gives us an opportunity to give bean processing, such as generating proxy objects. And the underlying aop implementation is also done in this way.

Attached is the order in which spring calls the post processor in initializing the bean.

On how to understand spring--BeanPostProcesstor to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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