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 JSON-based APIs

A key ingredient in building any web application is the ability to provide an API. In the olden days, this was complex and hard to ensure compatibility.

In this day and age, the world has mostly converged on a handful of formats, many based on JSON-based structures.

One of the powerful features of Spring Boot is that when you add Spring Web to a project, as we did at the beginning of this chapter, it adds Jackson to the classpath. Jackson is a JSON serialization/deserialization library that has been widely adopted by the Java community.

Jackson’s ability to let us define how to translate Java classes back and forth with our preferred flavor of JSON combined with Spring Boot’s ability to autoconfigure things means that we don’t have to lift another finger of setup to start coding an API.

To start things off, we create a new class in the same package we’ve been using throughout this chapter. Call it ApiController. At the...