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Spring Boot Cookbook
Spring Boot Cookbook

Spring Boot Cookbook: Over 35 recipes to help you build, test, and run Spring applications using Spring Boot

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Spring Boot Cookbook

Chapter 2. Configuring Web Applications

In the previous chapter, we learned 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 a 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 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 catalogues.

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 a web-based functionality. The following snippet is what it would look like:
    dependencies {
      compile("org.springframework.boot:spring-boot-starter-data-jpa")
      compile("org.springframework.boot:spring-boot-starter-jdbc")
      compile("org.springframework...

Creating a Spring Data REST service

In the previous example, we fronted our BookRepository 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 to expose it to the web.

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

How to do it…

  1. We will start by adding another dependency to our build.gradle file in order to add the spring-boot-starter-data-rest artefact:
    dependencies {
      ...
      compile("org.springframework.boot:spring-boot-starter-data-rest")
      ...
    }
  2. Now, let...

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 and so forth. 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 to 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. Luckily, Tomcat 8 already provides us with an implementation: RemoteIpFilter. All we will need...

Configuring custom interceptors

While Servlet Filters are a part of the Servlet API and have really 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; but 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 the case with Filters, Spring MVC comes with a number of premade HandlerInterceptors. The commonly used ones are LocaleChangeInterceptor and ThemeChangeInterceptor; but there...

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 to translate our entity beans objects into a JSON representation using Jackson library, writing the resulting JSON data to an HTTP response output stream. 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 can translate any Java Object into application/json...

Creating a basic RESTful application


While 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 catalogues.

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 a web-based functionality. The following snippet is what it would look like:

    dependencies {
      compile("org.springframework.boot:spring-boot-starter-data-jpa")
      compile("org.springframework.boot:spring-boot-starter-jdbc")
      compile("org.springframework.boot:spring-boot-starter-web")
      runtime...

Creating a Spring Data REST service


In the previous example, we fronted our BookRepository 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 to expose it to the web.

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

How to do it…

  1. We will start by adding another dependency to our build.gradle file in order to add the spring-boot-starter-data-rest artefact:

    dependencies {
      ...
      compile("org.springframework.boot:spring-boot-starter-data-rest")
      ...
    }
  2. Now, let's create a new...

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Description

Spring Boot is Spring's convention-over-configuration solution. This feature makes it easy to create Spring applications and services with absolute minimum fuss. Spring Boot has the great ability to be customized and enhanced, and is specifically designed to simplify development of a new Spring application. This book will provide many detailed insights about the inner workings of Spring Boot, as well as tips and recipes to integrate the third-party frameworks and components needed to build complex enterprise-scale applications. The book starts with an overview of the important and useful Spring Boot starters that are included in the framework, and teaches you to create and add custom Servlet Filters, Interceptors, Converters, Formatters, and PropertyEditors to a Spring Boot web application. Next it will cover configuring custom routing rules and patterns, adding additional static asset paths, and adding and modifying servlet container connectors and other properties such as enabling SSL. Moving on, the book will teach you how to create custom Spring Boot Starters, and explore different techniques to test Spring Boot applications. Next, the book will show you examples of configuring your build to produce Docker images and self-executing binary files for Linux/OSX environments. Finally, the book will teach you how to create custom health indicators, and access monitoring data via HTTP and JMX.

Who is this book for?

If you are a Spring Developer who has good knowledge level and understanding of Spring Boot and application development and now want to learn efficient Spring Boot development techniques in order to make the existing development process more efficient, then this book is for you.

What you will learn

  • Create Spring Boot applications from scratch
  • Configure and tune web applications and containers
  • Create custom Spring Boot autoconfigurations and starters
  • Use Spring Boot Test framework with JUnit, Cucumber, and Spock
  • Configure and tune web applications and containers
  • Deploy Spring Boot as selfstarting executables and Docker containers
  • Monitor data using DropWizard, Graphite, and Dashing
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Publication date : Sep 28, 2015
Length: 206 pages
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Language : English
ISBN-13 : 9781785284151
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Product Details

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Length: 206 pages
Edition : 1st
Language : English
ISBN-13 : 9781785284151
Languages :

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Table of Contents

8 Chapters
1. Getting Started with Spring Boot Chevron down icon Chevron up icon
2. Configuring Web Applications Chevron down icon Chevron up icon
3. Web Framework Behavior Tuning Chevron down icon Chevron up icon
4. Writing Custom Spring Boot Starters Chevron down icon Chevron up icon
5. Application Testing Chevron down icon Chevron up icon
6. Application Packaging and Deployment Chevron down icon Chevron up icon
7. Health Monitoring and Data Visualization Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.6
(5 Ratings)
5 star 60%
4 star 40%
3 star 0%
2 star 0%
1 star 0%
Kalaiselvan Dec 25, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Hands on development book. No much details about concept
Amazon Verified review Amazon
Shubham Aggarwal May 22, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Content this book covers is very practical and concise. 99% of the code in the book is 'run as is' which is excellent.The way this book teaches each concept with Spring Boot is excellent and it has nice presentation on how each goal should be achieved with its step by step layout.The sections 'How to do it' and 'what happened' were smartly designed to separate concepts from procedure to achieve a target. Covers very good area regarding Spring Boot, Docker section is very informative as well.
Amazon Verified review Amazon
Manu Bhasin Jun 05, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good
Amazon Verified review Amazon
Monkey Toed Freak Oct 22, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I recently starting learning Spring Boot and it's been very interesting. Developers will know though that writing the code and having it running locally isn't even half the job. Customisation for environments, deployment tasks and adding monitoring etc. can add just as much time.That's why I was very pleased with this book, I was half expecting it to be a series of small tutorials about coding with Spring Boot but it takes a very unusual approach that covers the edge cases of development and has a strong focus on what Spring Boot brings to the table. The Application Testing chapter is very good and cover using Mockito, Cucumber and Spock.The deployment chapters cover building an executable jar, accessing environment specific variables and most interesting for me, creating Docker images. It also covers application monitoring, another aspect Spring Boot gives you for free.I'm still reading through the book but it's definitely one that's full of information that you won't normally get in development books. It's well written and easy to dive into because the chapters are all self contained.If you're interested in Spring Boot, I strongly recommend this in addition to one about developing in Spring Boot.
Amazon Verified review Amazon
Amazon Customer Jun 28, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Good book. It is very helpful if u run the boot application first and than start reading.
Amazon Verified review Amazon
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