Book Image

Learning Spring Boot 3.0 - Third Edition

By : Greg L. Turnquist
Book Image

Learning Spring Boot 3.0 - Third Edition

By: Greg L. Turnquist

Overview of this book

Spring Boot 3 brings more than just the powerful ability to build secure web apps on top of a rock-solid database. It delivers new options for testing, deployment, Docker support, and native images for GraalVM, along with ways to squeeze out more efficient usage of existing resources. This third edition of the bestseller starts off by helping you build a simple app, and then shows you how to secure, test, bundle, and deploy it to production. Next, you’ll familiarize yourself with the ability to go “native” and release using GraalVM. As you advance, you’ll explore reactive programming and get a taste of scalable web controllers and data operations. The book goes into detail about GraalVM native images and deployment, teaching you how to secure your application using both routes and method-based rules and enabling you to apply the lessons you’ve learned to any problem. If you want to gain a thorough understanding of building robust applications using the core functionality of Spring Boot, then this is the book for you. By the end of this Spring Boot book, you’ll be able to build an entire suite of web applications using Spring Boot and deploy them to any platform you need.
Table of Contents (17 chapters)
1
Part 1: The Basics of Spring Boot
3
Part 2: Creating an Application with Spring Boot
8
Part 3: Releasing an Application with Spring Boot
12
Part 4: Scaling an Application with Spring Boot

Creating a Spring MVC web controller

Assuming we have unzipped that ZIP file from the Spring Initializr and imported it into our IDE, we can immediately start writing a web controller.

But for starters, what is a web controller?

Web controllers are bits of code that respond to HTTP requests. These can comprise an HTTP GET /
request that is asking for the root URL. Most websites respond with some HTML. But web controllers can also answer requests for APIs that yield JavaScript Object Notation (JSON), such as HTTP GET /api/videos. Furthermore, web controllers do the heavy lifting of transporting provided JSON when the user is affecting change with an HTTP POST.

The piece of the Spring portfolio that affords us the ability to write web controllers is Spring MVC. Spring MVC is Spring Framework’s module that lets us build web apps on top of servlet-based containers using the Model-View-Controller (MVC) paradigm.

Yes, the application we are building is Spring Boot. But...