spring-:implementations-of-ApplicationContext

The Spring framework provides a variety of ApplicationContext interface implementation to adapt to different application scenarios and application types. The following is the key implementation subdivision:

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<.> 1. Based on the configuration of the annotation

AnnotationConfigApplicationContext
• Independent implementation of Java -based configuration (@Configuration,@Bean,@Component, etc.).
  • Very suitable for modern Spring applications, these applications do not use XML configuration.
  • commonly used in Spring Boot or independent applications.

<.> 2. Configuration based on XML

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ClassPathxmlapplicationContext

• Load the bean definition in the xml configuration file from the class path. It is commonly used for older Spring applications.
  • FilesystemXMLApplicationContext
similar to , but the XML configuration file is loaded from the file system path instead of the class path.
• • ClassPathXmlApplicationContext <.> 3. WEB dedicated context

xmlwebapplicationContext

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Load the special implementation of web defined by XML Bean.

Usually used for traditional Spring MVC applications.

• Integrate with web.xml configuration or SERVLET context.
  • AnnotationConfigWebApplicationContext
  For web -based implementation based on Java configuration.
  in modern Spring MVC or Spring Boot Web application.
Allows to configure web -related bean -related bean through annotations such as@Controller,@RESTCONTROLLLER.
• <.> 4. General application context
  GenericApplicationContext

Provide the flexible implementation of the context of general application applications.

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can be dynamically registered by or method.

It is usually used as a base class to customize implementation.

• GENERICWAPPLICONTEXT
  Web -specific variant.
  • registerBean() can be configured by programming in web applications. registerSingleton()
<.> 5. Responsible context
• ReactiveBapplicationContext
  • GenericApplicationContext
  Designed for the response application built by Spring Webflux.
  Support non -blocking and event -driven architecture.

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<.> 6. Special uses below

• StaticApplicationContext
  Simple programming implementation for testing or fast prototype design.
  Allows you to register bean in a programming manner without XML or annotation.
  It is rarely used in actual applications.

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ConfigurableApplicationContext

It is not implemented independently, but an extension interface that can configure the context of the application (for example, Refresh (), CLOSE ()).

Realized by other contexts (such as
• ).

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Commonly used implementation

实现	使用场景
AnnotationConfigApplicationContext	独立应用程序的基于Java的配置。
ClassPathXmlApplicationContext	从类路径加载的XML配置。
AnnotationConfigWebApplicationContext	Web应用程序的基于Java的配置。
XmlWebApplicationContext	Web应用程序的XML配置。
GenericApplicationContext	可编程的通用上下文。

How many types are there?

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If you count the various variants and unusual implementation, Spring provides about 8-10 different implementation

. However, in practice, only a few (such as

and ) are widely used in modern applications. ApplicationContext AnnotationConfigApplicationContext

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