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Spring MVC Unveiled: How It Leverages Servlet Technology
- This article explores how Spring leverages Servlet technology to bootstrap and efficiently dispatch requests in a Spring MVC application.
- Spring MVC revolves around a single servlet, the DispatcherServlet, which handles every incoming request.
- Spring creates and initializes an instance of WebApplicationContext, a sub-interface of ApplicationContext, when a DispatcherServlet is registered.
- Spring uses a ContextLoaderListener to create and initialize a root WebApplicationContext, establishing a hierarchy where the root context provides shared beans to all DispatcherServlet instances.
- Programmers can implement the WebApplicationInitializer interface to perform tasks during the application startup, allowing developers to have a say over the initialization process.
- DispatcherServlet delegates the real work of processing requests to essential beans such as HandlerMapping, HandlerAdapter, and ViewResolver.
- For each incoming request, the DispatcherServlet calls the service() method and then takes charge, using HandlerMappings to identify the handler and invoking it through a HandlerAdapter.
- Spring Boot simplifies setting up and running a Spring MVC application by removing much of the boilerplate configuration associated with traditional setups.
- With Spring Boot, setting up a Spring MVC application no longer requires extensive configuration.
- Mastering the underlying architecture and design principles of Spring MVC is essential for deepening understanding about the Spring framework.
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