Bean scope of spring notes

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Singleton	There is only one bean instance in the springioc container, and the bean exists as a single instance.
Prototype	Every time a bean is called from the container, a new instance is returned, that is, every time getbean () is called, The xxxbean () operation is executed.
Request	Each HTTP request creates a new bean. This scope applies only to the webapplicationcontext environment.
Session	The same http session shares a bean. This scope applies only to the webapplicationcontext environment.
Globalsession	The same global session shares a bean, which is generally used in the Portlet application environment. This scope applies only to the webapplicationcontext environment.

Configuration method: Scope = "<scope type>" If the last three scopes are used. configure <listener> <listener-class> Org. springframework. web. context. request. requestcontextlisterner </listener-class> </listener>

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