Book Image

Learning Spring Boot 2.0 - Second Edition

By : Greg L. Turnquist, Greg L. Turnquist
Book Image

Learning Spring Boot 2.0 - Second Edition

By: Greg L. Turnquist, Greg L. Turnquist

Overview of this book

Spring Boot provides a variety of features that address today's business needs along with today's scalable requirements. In this book, you will learn how to leverage powerful databases and Spring Boot's state-of-the-art WebFlux framework. This practical guide will help you get up and running with all the latest features of Spring Boot, especially the new Reactor-based toolkit. The book starts off by helping you build a simple app, then shows you how to bundle and deploy it to the cloud. From here, we take you through reactive programming, showing you how to interact with controllers and templates and handle data access. Once you're done, you can start writing unit tests, slice tests, embedded container tests, and even autoconfiguration tests. We go into detail about developer tools, AMQP messaging, WebSockets, security, and deployment. You will learn how to secure your application using both routes and method-based rules. By the end of the book, you'll have built a social media platform from which to apply the lessons you have learned to any problem. If you want a good understanding of building scalable applications using the core functionality of Spring Boot, this is the book for you.
Table of Contents (11 chapters)

Wiring in image ownership

Spring WebFlux's ServerWebExchange comes prepared for security by providing a getPrincipal() API that returns Mono<Principal>. While the default version, straight out of Spring Framework, supplies Mono.empty(), Spring Security automatically hooks in a filter to supply a real value via WebSessionSecurityContextRepository.

With Spring Security and Spring Session hooked into all our web calls, we can leverage this information every time a new image is uploaded.

First of all, we can adjust our Image domain object as follows:

    public class Image { 
      @Id private String id; 
      private String name; 
      private String owner; 

This last code is the same POJO that we've used throughout this book with one change:

  • It now has a String owner property. This lets us associate an image with whoever...