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This article mainly introduces "what is java spring". In daily operation, I believe many people have doubts about what java spring is. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about "what is java spring?" Next, please follow the editor to study!

Spring is an open source framework, which makes java development more modular and comprehensive, it runs through the business logic layer, presentation layer, persistence layer, so that each function separates each functional module, reduces coupling, increases code reuse, and increases development efficiency.

I think spring is a container whose core IOC is reversed by IOC control, handing control to the spring container, which dynamically creates objects based on xml configuration files. Java reflection technology is used to create and invoke objects dynamically.

And through DI dependency injection, dependent objects are dynamically injected into bean components when spring is in charge of creating objects.

AOP is another core of spring, aspect-oriented programming.

In the case of not modifying the program, the program is expanded dynamically. For example, add log function, authority authentication function.

Spring uses the proxy pattern to implement aop:

1. Dynamic agent: jdk dynamic agent, cglib agent

Use jdk dynamic proxy: implement the invacationhander interface, interface-based approach.

Cglib is based on the class approach.

2. Static proxy:

A proxy class corresponds to a proxied class, an one-to-one correspondence. There is a high degree of coupling in the way of inheritance between classes.

Personal simple understanding here for the interview to answer questions.

At this point, the study of "what is java spring" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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