What design patterns are used in the Spring framework?
A large number of design patterns are used in the Spring framework, and the representative ones are listed below:
1. Singleton mode: The bean in spring is a singleton mode by default
2. Front-end controller: Spring uses the front-end controller DispatcherServlet to distribute requests
3. Factory mode: BeanFactory creates an instance of an object
IOC understanding: hand over the creation, initialization, and destruction of objects to spring control to realize control inversion