Book Image

Developing Java Applications with Spring and Spring Boot

By : Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Book Image

Developing Java Applications with Spring and Spring Boot

By: Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov

Overview of this book

Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The course is up made of three modules, each one having a take-away relating to building end-to-end java applications. The first module takes the approach of learning Spring frameworks by building applications.You will learn to build APIs and integrate them with popular fraemworks suh as AngularJS, Spring WebFlux, and Spring Data. You will also learn to build microservices using Spring's support for Kotlin. You will learn about the Reactive paradigm in the Spring architecture using Project Reactor. In the second module, after getting hands-on with Spring, you will learn about the most popular tool in the Spring ecosystem-Spring Boot. You will learn to build applications with Spring Boot, bundle them, and deploy them on the cloud. After learning to build applications with Spring Boot, you will be able to use various tests that are an important part of application development. We also cover the important developer tools such as AMQP messaging, websockets, security, and more. This will give you a good functional understanding of scalable development in the Spring ecosystem with Spring Boot. In the third and final module, you will tackle the most important challenges in Java application development with Spring Boot using practical recipes. Including recipes for testing, deployment, monitoring, and securing your applications. This module will also address the functional and technical requirements for building enterprise applications. By the end of the course you will be comfortable with using Spring and Spring Boot to develop Java applications and will have mastered the intricacies of production-grade applications.
Table of Contents (34 chapters)
Title Page - Courses
Copyright and Credits - Courses
Packt Upsell - Courses

Configuring custom interceptors

While servlet filters are a part of the Servlet API and have nothing to do with Spring besides being automatically added in the filter chain --Spring MVC provides us with another way of wrapping web requests: HandlerInterceptor. According to the documentation, HandlerInterceptor is just like a filter. Instead of wrapping a request in a nested chain, an interceptor gives us cutaway points at different phases, such as before the request gets handled, after the request has been processed, before the view has been rendered, and at the very end, after the request has been fully completed. It does not let us change anything about the request, but it does let us stop the execution by throwing an exception or returning false if the interceptor logic determines so.

Similar to using filters, Spring MVC comes with a number of premade HandlerInterceptors. The commonly used ones are LocaleChangeInterceptor and ThemeChangeInterceptor; but there are certainly others that...