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Sprint MVC Basic Infos
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layered architecture.md

In Spring MVC uses a layered architecture

controllers > services > repositories > models > database.

Controllers

hold the presentation (UI) logic – process user request (GET / POST / other), prepare data for the view and render the view (or redirect to another URL). Example: prepare and show the home page.

Services

hold the business logic. Often just call some repository method. Example: create new post / show a post for deleting / delete post. Services may have several implementations: DB based or stub based.

Repositories

implement the database CRUD operations (create / read / edit / delete) in the database for certain entity class (model). Examples: find post by id / delete post by id. Often provided by the framework (not written by hand).

Models (entity classes)

holds the data about the application data. Examples: user, post, tag, …

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