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This article mainly introduces what is the use of the WebApplicationContext interface in the Spring framework, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Looking at the name of the WebApplicationContext interface, we should know that this interface is specially prepared for Web applications, and it allows configuration files to be loaded from the path of the Web root directory and initialized. We can get a reference to ServletContext from the WebApplicationContext interface. We can get an instance of the WebApplicationContext interface through the WebApplicationContextUtils utility class. In addition, three new scopes have been added to the WebApplicationContext interface: request, session, and global session. In non-Web applications, objects have only two scopes, namely singleton and prototype.

The initialization of WebApplicationContext is different from BeanFactory and ApplicationContext. Because WebApplicationContext is designed specifically for Web applications, WebApplicationContext requires a ServletContext instance, that is, a Web container is required to complete initialization. In spring, we can use the ContextLoaderListener listener to start WebApplicationContext.

Let's take a look at the specific configuration of the listener, which is configured in web.xml.

In spring, we know that IOC containers are divided into parent-child containers. The child container can access the objects of the parent container, but the parent container cannot access the objects of the child container. The id of an object in a container must be unique, but a child container can have the same object as the parent container id. The advantage of this is that we can add special sub-containers to an existing container in a way that provides some functionality for the container. The most typical application of parent-child containers in spring is springMVC.

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