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This article introduces the relevant knowledge of "what is the way of automatic assembly of Spring containers". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The Spring container can automatically assemble bean, that is, you can let Spring parse bean by checking BeanFactory.

1. No-- > this is the default method, which means that there is no automatic assembly and you need to use a bean reference to assemble.

2. ByName-- > inject object dependencies according to the name of bean. It matches and assembles properties with bean of the same name in the xml file

3. ByType-- > if the object dependency is injected according to the type of bean, and the type of the assembly property matches a bean name in the xml file, then the assembly property

4. Constructor-- > calls the constructor of the class to inject object dependencies. There are a lot of parameters.

5. Autodetect-- > first the container is assembled using autowire through the constructor, and if not, through byType

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