Ojas Sharma@OjasSharma276
Explaining Spring MVC as if you are a 12 year old.
M: Model
V: View
C: Controller
>Spring MVC is a Java web framework for building server-side web apps and REST APIs.
What it does:
>Controller handles HTTP requests.
>Model holds business data.
>View renders the response (JSP, JSON, etc.)
Why people use it:
>Annotation-based config (@Controller, @RequestMapping, @GetMapping).
>Easy REST API creation.
>Tight integration with Spring Core, Security, Data JPA.
Request flow:
>Client sends request
>DispatcherServlet receives it
>Controller processes it
>Model data prepared
>View renders response or JSON returned
Now Imma explain the internal working using the attached diagram:
1. Client sends request → DispatcherServlet:
>DispatcherServlet intercepts every request.
2. DispatcherServlet → Handler Mapping:
>Handler Mapping’s job is to figure out which controller method matches the URL.
3. DispatcherServlet → Handler Adapter:
>DispatcherServlet now knows which controller to call, but it needs someone who actually knows how to call it. That’s the Handler Adapter.
4. Handler Adapter → Controller:
>Finally, your Controller method runs. This is where your business logic starts.
5. Controller returns Model + View Name:
>The controller sends two things back:
A view name (e.g., "students").
A Model containing the data (e.g., list of students).
6. DispatcherServlet → ViewResolver:
>ViewResolver looks at the view name and figures out which template file to use.
7. DispatcherServlet → View:
>DispatcherServlet passes the Model and chosen View to the actual view renderer. This is where data gets injected into the template.
8. View → Response to client:
>The view generates the final HTML (or JSON if it’s a REST controller) and gives it back to the client.
Easyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
