Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By : Raja CSP Raman, Ludovic Dewailly
Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By: Raja CSP Raman, Ludovic Dewailly

Overview of this book

REST is an architectural style that tackles the challenges of building scalable web services. In today's connected world, APIs have taken a central role on the web. APIs provide the fabric through which systems interact, and REST has become synonymous with APIs.The depth, breadth, and ease of use of Spring makes it one of the most attractive frameworks in the Java ecosystem. Marrying the two technologies is therefore a very natural choice.This book takes you through the design of RESTful web services and leverages the Spring Framework to implement these services. Starting from the basics of the philosophy behind REST, you'll go through the steps of designing and implementing an enterprise-grade RESTful web service. Taking a practical approach, each chapter provides code samples that you can apply to your own circumstances.This second edition brings forth the power of the latest Spring 5.0 release, working with MVC built-in as well as the front end framework. It then goes beyond the use of Spring to explores approaches to tackle resilience, security, and scalability concerns. Improve performance of your applications with the new HTTP 2.0 standards. You'll learn techniques to deal with security in Spring and discover how to implement unit and integration test strategies.Finally, the book ends by walking you through building a Java client for your RESTful web service, along with some scaling techniques using the new Spring Reactive libraries.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Spring Security and JWT (JSON Web Token)

Chapter 1. A Few Basics

As the world has moved into the big data era, collecting and dealing with data alone has become the main part of most of our web applications, and web services, too, as web services deal only with data, not the other parts of the user experience, look, and feel. Even though user experience is very important for all web applications, web services play a major role in dealing with data by consuming services from the client side.

In the early days of web services, Simple Object Access Protocol (SOAP) was the default choice for all backend developers who dealt with web service consumption. SOAP was mainly used in HTTP and Simple Mail Transfer Protocol (SMTP) for message transmission across the same or different platforms. When there was no JavaScript Object Notation (JSON) format available for web services, XML used to be the only available format SOAP could use for the web service consumption.

However, in the JSON era, Representational State Transfer (REST) started dominating web service based applications, as it supports multiple formats, including JSON, XML, and other formats. REST is simpler than SOAP, and the REST standards are easy to implement and consume. Also, REST is lightweight as compared to SOAP.

In this chapter, we will cover the following topics:

  • REST—a basic understanding
  • Reactive programming and its basics, including the benefits of Reactive programming
  • Spring 5 basics with Reactive programming
  • A sample RESTful web service that will be used as a base for the rest of the book