Book Image

Spring 5.0 Cookbook

By : Sherwin John C. Tragura
Book Image

Spring 5.0 Cookbook

By: Sherwin John C. Tragura

Overview of this book

The Spring framework has been the go-to framework for Java developers for quite some time. It enhances modularity, provides more readable code, and enables the developer to focus on developing the application while the underlying framework takes care of transaction APIs, remote APIs, JMX APIs, and JMS APIs. The upcoming version of the Spring Framework has a lot to offer, above and beyond the platform upgrade to Java 9, and this book will show you all you need to know to overcome common to advanced problems you might face. Each recipe will showcase some old and new issues and solutions, right from configuring Spring 5.0 container to testing its components. Most importantly, the book will highlight concurrent processes, asynchronous MVC and reactive programming using Reactor Core APIs. Aside from the core components, this book will also include integration of third-party technologies that are mostly needed in building enterprise applications. By the end of the book, the reader will not only be well versed with the essential concepts of Spring, but will also have mastered its latest features in a solution-oriented manner.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Implementing user authentication


Although Spring Security is the most straightforward and easy solution for securing any Spring MVC applications, software designers always need the option of customizing the authentication procedure for non-complex and small-scale security requirements. This recipe will provide the solution for how to use @Aspect and advices in implementing security modules.

Getting started

Open ch05 and add the following @Aspect to the loginSubmit() request handler of EmployeeController.

How to do it...

Let us create a custom login interceptor that validates the user's credentials using database authentication:

  1. This recipe uses aspects to pre- and post-validate user credentials using the authentication services provided by the previous recipes. Create an aspect class, LoginAuthAspect, which contains the following @Pointcut definitions and a Log4J logger:
@Component 
@Aspect 
public class LoginAuthAspect { 
   
  private Logger logger = 
      Logger.getLogger(LoginAuthAspect.class...