BeanPostProcessor的示例

Question

I know how spring BeanPostProcessor works but I exactly don't get any such scenarios where BeanPostProcessor might be very helpful. If someone has implemented BeanPostProcessor in his/her application, then please give a brief about that.

Answer 1

The BeanPostProcessor interface is arguably the most basic and useful tool of the Spring IoC container. Take a look at the implementing classes in the javadoc.

You typically use Spring to inject beans into other beans. Spring uses AutowiredAnnotationBeanPostProcessor to achieve this. After the bean has been instantiated, this BeanPostProcessor scan the bean's fields for @Autowired targets. If it finds any, it tries to resolve a bean from the context to inject. You can find the source code here .