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MVC architecture summarized.

Hey there! Let me break down MVC for you, we’ll be using the Spring Boot framework. Follow along, will you?

Spring Boot is a framework that’s all the rage for building enterprise-level Java applications. It’s packed with features that make it easy to use and powerful, so developers can focus on writing code instead of fussing around with configurations.

MVC is a fancy acronym that stands for Model-View-Controller, which is a design pattern commonly used for web application development. It breaks the application down into three separate components, each with a specific purpose.

Controllers handle HTTP requests and responses, which are like the bread and butter of communication between a client and server. Controller classes and Servlet classes can handle these requests and responses, and they can even parse and generate them too! Plus, both classes can execute business logic, handle multithreading, and integrate with web containers like Tomcat, Glassfish, and more. Here are some examples of handling HTTP requests and responses in Java Spring Boot Controller Class and Servlet Class:

Controller Class
Servlet Class

Models, on the other hand, are Java classes that represent entities in your application’s domain( models = objects within your application’s “universe”). For example, if you’re building a library management system, you might have a model for a “Book” entity, after all, what’s a library without books?

And our superhero framework with the “S on the chest” (NOTE: still talking about Spring Boot here) can create a database to store instances of these models in a snap. Spring Boot can connect to external databases like MySQL or PostgreSQL. And performing CRUD operations on these models is made easy with repositories, which are interfaces that define methods for performing Data Manipulation Language (DML), thereby providing Data Access Objects behaviors or DAO-like attributes.

Business logic is what makes your application tick! It processes and manages user input, performs calculations, and interacts with external systems and databases. It’s also responsible for validating and storing data, as well as dictating the application’s responses to different user actions and scenarios. Examples of business logic include authentication and authorization, payment processing, data validation, and workflow management.

Service class / Business logic layer

Finally, views are responsible for presenting data to the user. Templating engines like JSP and Thymeleaf make this easy by allowing developers to write views using templates, which are reusable pieces of code that can be customized with dynamic data. JSP is a mature technology that’s supported by a large community of developers, while Thymeleaf is newer and offers more advanced features like working with XML and JSON data.

So there you have it, MVC in a nutshell! And Spring Boot is a powerful, opinionated, and easy-to-use framework for building enterprise-level Java applications with a separation of concerns like MVC style architecture and more.

Thymeleaf

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