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Spring Boot 2.0 Cookbook
Spring Boot 2.0 Cookbook

Spring Boot 2.0 Cookbook: Configure, test, extend, deploy, and monitor your Spring Boot application both outside and inside the cloud , Second Edition

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Spring Boot 2.0 Cookbook

Configuring Web Applications

In the previous chapter, we learned about how to create a starting application template, add some basic functionalities, and set up a connection to a database. In this chapter, we will continue to evolve our BookPub application and give it a web presence.

In this chapter, we will learn about the following topics:

  • Creating a basic RESTful application
  • Creating Spring Data REST service
  • Configuring custom servlet filters
  • Configuring custom interceptors
  • Configuring custom HttpMessageConverters
  • Configuring custom PropertyEditors
  • Configuring custom type formatters

Creating a basic RESTful application

While the command-line applications do have their place and use, most of today's application development is centered around web, REST, and data services. Let's start with enhancing our BookPub application by providing it with a web-based API in order to get access to the book catalogs.

We will start where we left off in the previous chapter, so there should already be an application skeleton with the entity objects and a repository service defined and a connection to the database configured.

How to do it...

  1. The very first thing that we will need to do is add a new dependency to build.gradle with the spring-boot-starter-web starter to get us all the necessary libraries for web...

Creating Spring Data REST service

In the previous example, we fronted our BookRepository interface with a REST controller in order to expose the data behind it via a web RESTful API. While this is definitely a quick and easy way to make the data accessible, it does require us to manually create a controller and define the mappings for all the desired operations. To minimize the boilerplate code, Spring provides us with a more convenient way: spring-boot-starter-data-rest. This allows us to simply add an annotation to the repository interface and Spring will do the rest to expose it to the web.

We will continue from where we finished in the previous recipe, and so the entity models and the BookRepository interface should already exist.

How to do it...

...

Configuring custom servlet filters

In a real-world web application, we almost always find a need to add facades or wrappers to service requests, to log them, filter out bad characters for XSS, perform authentication, and so on. Out of the box, Spring Boot automatically adds OrderedCharacterEncodingFilter and HiddenHttpMethodFilter, but we can always add more. Let's see how Spring Boot helps us achieve this task.

Among the various assortments of Spring Boot, Spring Web, Spring MVC, and others, there is already a vast variety of different servlet filters that are available and all we have to do is define them as beans in the configuration. Let's say that our application will be running behind a load balancer proxy and we would like to translate the real request IP that is used by the users instead of the IP from the proxy when our application instance receives the request...

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...

Configuring custom HttpMessageConverters

While we were building our RESTful web data service, we defined the controllers, repositories, and put some annotations on them; but nowhere did we do any kind of object translation from the Java entity beans to the HTTP data stream output. However, behind the scenes, Spring Boot automatically configured HttpMessageConverters so as to translate our entity beans into a JSON representation written to HTTP response using the Jackson library. When multiple converters are available, the most applicable one gets selected based on the message object class and the requested content type.

The purpose of HttpMessageConverters is to translate various object types into their corresponding HTTP output formats. A converter can either support a range of multiple data types or multiple output formats, or a combination of both. For example, MappingJackson2HttpMessageConverter...

Configuring custom PropertyEditors

In the previous example, we learned how to configure converters for an HTTP request and response data. There are other kinds of conversions that take place, especially in regards to dynamically converting parameters to various objects, such as Strings to Date or an Integer.

When we declare a mapping method in a controller, Spring allows us to freely define the method signature with the exact object types that we require. The way in which this is achieved is via the use of the PropertyEditor implementations. PropertyEditor is a default concept defined as part of the JDK and designed to allow the transformation of a textual value to a given type. It was initially intended to be used to build Java Swing / Abstract Window Toolkit (AWT) GUI and later proved to be a good fit for Spring's need to convert web parameters to method argument types...

Configuring custom type formatters

Mostly because of its statefulness and lack of thread safety, since version 3, Spring has added a Formatter interface as a replacement for PropertyEditor. The formatters are intended to provide a similar functionality but in a completely thread-safe manner and focusing on a very specific task of parsing a String in an object type and converting an object to its String representation.

Let's suppose that for our application, we would like to have a formatter that would take the ISBN number of a book in a String form and convert it to a book entity object. This way, we can define the controller request methods with a Book argument when the request URL signature only contains an ISBN number or a database ID.

How to do it...

...
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Key benefits

  • • This collection of effective recipes serves as guidelines for Spring Boot application development
  • • Get up to date with features of the latest version of Spring Boot 2.0
  • • Tips and tricks to improve your efficiency through the stages of software development

Description

The Spring framework provides great flexibility for Java development, which also results in tedious configuration work. Spring Boot addresses the configuration difficulties of Spring and makes it easy to create standalone, production-grade Spring-based applications. This practical guide makes the existing development process more efficient. Spring Boot Cookbook 2.0 Second Edition smartly combines all the skills and expertise to efficiently develop, test, deploy, and monitor applications using Spring Boot on premise and in the cloud. We start with an overview of the important Spring Boot features you will learn to create a web application for a RESTful service. Learn to fine-tune the behavior of a web application by learning about custom routes and asset paths and how to modify routing patterns. Address the requirements of a complex enterprise application and cover the creation of custom Spring Boot starters. This book also includes examples of the new and improved facilities available to create various kinds of tests introduced in Spring Boot 1.4 and 2.0, and gain insights into Spring Boot DevTools. Explore the basics of Spring Boot Cloud modules and various Cloud starters to make applications in “Cloud Native” and take advantage of Service Discovery and Circuit Breakers.

Who is this book for?

This book is for Java Developers who have good knowledge and understanding of Spring and Java application development.

What you will learn

  • • Get to know Spring Boot Starters and create custom auto-configurations
  • • Work with custom annotations that enable bean activation
  • • Use DevTools to easily develop and debug applications
  • • Learn the effective testing techniques by integrating Cucumber and Spock
  • • Observe an eternal application configuration using Consul
  • • Move your existing Spring Boot applications to the cloud
  • • Use Hashicorp Consul and Netflix Eureka for dynamic Service Discovery
  • • Understand the various mechanisms that Spring Boot provides to examine an application's health
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Publication date : Feb 26, 2018
Length: 286 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787129825
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Length: 286 pages
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Language : English
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Table of Contents

10 Chapters
Getting Started with Spring Boot Chevron down icon Chevron up icon
Configuring Web Applications Chevron down icon Chevron up icon
Web Framework Behavior Tuning Chevron down icon Chevron up icon
Writing Custom Spring Boot Starters Chevron down icon Chevron up icon
Application Testing Chevron down icon Chevron up icon
Application Packaging and Deployment Chevron down icon Chevron up icon
Health Monitoring and Data Visualization Chevron down icon Chevron up icon
Spring Boot DevTools Chevron down icon Chevron up icon
Spring Cloud Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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4 star 33.3%
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1 star 66.7%
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Very helpful book. Concepts explained very well. One should really refer the book to have concepts clear. One to recommend.
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Not for professionals
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I can't tell you anything about the book, since I download the Kindle preview to check it out and it STOPS at the table of contents! NO sample text.
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Unfortunately, due to several restrictions, we are unable to ship to the following countries:

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