Spring Boot and Angular E-Book

Devlin Basilan Duldulao

• Herausgeber: Packt Publishing
• Kategorie: Fachliteratur
• Sprache: Englisch

Seitenzahl: 426

Veröffentlichungsjahr: 2022

Beschreibung

Angular makes building applications with the web easy and Spring Boot helps get an application up and running using just a few lines of code and minimal configuration. This book provides insights into building full-stack apps using Angular and Spring Boot effectively to reduce overall development time and increase efficiency.
You'll start by setting up your CI/CD pipeline and then build your web application’s backend guided by best practices. You'll then see how Spring Boot allows you to build applications faster and more efficiently by letting the Spring Framework and Spring Boot extension do the heavy lifting. The book demonstrates how to use Spring Data JPA and add its dependencies along with Postgres dependencies in the project to save or persist a user's data in a database for future use. As you advance, you'll see how to write tests and test a service using Mockito. Finally, you'll create a CI workflow or pipeline for a Spring Boot and Angular application to enable operations to deliver quality applications faster.
By the end of this Spring Boot and Angular book, you'll be able to build a full-stack web application and deploy it through continuous integration and continuous deployment.

Leseprobe

Spring Boot and Angular

Hands-on full stack web development with Java, Spring, and Angular

Devlin Basilan Duldulao

Seiji Ralph Villafranca

BIRMINGHAM—MUMBAI

Spring Boot and Angular

Copyright © 2022 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

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To my father Alberto Duldulao, I miss you, tay (dad). On the day I lost you, I lost a father, a friend, and an idol who I looked up to. You will always be in my heart, tay. I miss you every day. Thanks again for your love, support, and inspiration.

– Devlin Duldulao (Utoy)

To my mother Arceli Villafranca, who gave everything to me and who is the reason why I’m here. To my sister Sheila Villafranca, who always supports me, and to my partner Shey Cadavero, who gives me strength and inspiration every day.

– Seiji Villafranca

Contributors

About the authors

Devlin Basilan Duldulao is a full-stack engineer with over 8 years of web, mobile, and cloud development experience. He has been a recipient of Microsoft’s Most Valuable Professional (MVP) award since 2018 and earned the title of Auth0 Ambassador for his passion for sharing best practices in application securities. Devlin has passed some prestigious exams in software and cloud development such as the MSCD, Azure Associate Developer, AWS Associate Developer, and Terraform Associate certifications.

Perhaps it was serendipity that made him venture into the coding world after a short stint in the medical field. However, once he stepped into it, he fell for it hook, line, and sinker – but in the right way, he claims. Devlin often finds himself engrossed in solving coding problems and developing apps, even to the detriment of his once-active social life.

One of the things that motivates him is ensuring the long-term quality of his code, including looking into ways to transform legacy code into more maintainable and scalable applications. Devlin enjoys tackling challenging projects or applications for high-level clients and customers, as he currently does at his company based in Norway. He also provides training and consultation for international corporations.

One of his other interests is giving talks at IT conferences worldwide and meeting unique people in the industry. Devlin is currently based in Oslo, Norway with his wife. He is a senior software engineer at Inmeta Consulting, a subsidiary of the Crayon group of companies.

Seiji Ralph Villafranca graduated cum laude with a BSc in computer science from the University of Santo Tomas in the Philippines. He has 6 years of experience in web and mobile development and has also earned the title of Auth0 Ambassador for his passion for application security. He holds several certifications in Angular development from beginner to expert level.

Seiji is also one of the community leaders of Angular Philippines, which is the largest Angular group in the Philippines; the community has led him to speak at different meetups of tech communities, workshops, and even local and international conferences. He is enthusiastic about sharing knowledge of coding and organizing events and meetups for the community, as well as writing content for students and professionals. He also has been a mentor at several hackathons, as he loves the startup community.

Seiji loves to develop new projects that are on the web or mobile and he is currently a senior software engineer at a company based in Malaysia. He is not only a coder but also a mentor, teacher, and trainer for students, professionals, and companies.

About the reviewer

Rajeshkumar Muthaiah works as Technical Lead in an international bank. He has strong experience in designing and developing high scale applications using a wide range of technologies since 2010. He works on various technologies including Java, Dart, Flutter, Angular, React, Spring, Hibernate, and Sass. Rajeshkumar has worked on various industries including Aviation, Banking, and Finance. He is very passionate about learning new technologies.

When not working on code, he likes reading books, as well as solving puzzles and traveling. He is very fond of cubes such as 5x5, megaminx, pyraminx, and so on., Currently, he lives with his wife Ranju in Singapore.

Table of Contents

Preface

Part 1: Overview of Spring Boot and Angular Development

1

Spring Boot and Angular – The Big Picture

Technical requirements

Introducing Spring Boot

The advantages of using Spring Boot

Differences between Spring and Spring Boot

Dependency examples for Spring and Spring Boot

What’s new in Java 17?

Sealed classes

The foreign function and memory API

Pattern matching with switch statements

The Applet API

The experimental AOT and JIT compilers

Introducing Angular

History of Angular

The advantages of using Angular

Summary

2

Setting Up the Development Environment

Technical requirements

Installing VS Code and IntelliJ IDEA

VS Code

IntelliJ IDEA

Installing Java 17

Windows installation

macOS installation

Linux installation

Installing SDKMAN

SDKMAN features

Installation on macOS and Linux

Installation on Windows

Setting up IntelliJ IDEA with Java 17

Using Java 17 on new projects

Using Java 17 on existing projects

Installing REST Client VS Code or JetBrains and Angular DevTools

Installing REST Client in VS Code

Installing Angular DevTools

Installing Git version control

Summary

Part 2: Backend Development

3

Moving into Spring Boot

Technical requirements

Understanding Spring Boot

Spring Boot architecture

Spring Boot flow architecture

Understanding REST

Using Spring Initializr

Web-based interface

Via IntelliJ IDEA

Dependency injection

Inversion of control

The basics of dependency injection

Annotation and beans

Types of annotations

Understanding beans

Summary

4

Setting Up the Database and Spring Data JPA

Technical requirements

Connecting to a database using a PSQL container

PostgreSQL

Installing PostgreSQL

Spring Data JPA

The advantages of Spring Data JPA

Repositories provided by Spring Data JPA

Spring Data JPA on Spring Boot

Adding Spring Data JPA and PostgreSQL dependencies

Adding with Spring Initializr

Adding an existing project

Connecting to a database

Configuring the database properties

Connecting using Spring JDBC

Connecting using Spring Data JPA

Summary

5

Building APIs with Spring

Technical requirements

Starting the server

Adding models

Creating models with DTOs and Lombok

Writing services

JPA repository

Adding controllers

Adding Redis for caching

Installing the Redis server

Configuring Redis on Spring Boot

Summary

6

Documenting APIs with the OpenAPI Specification

Technical requirements

Setting up springdoc-openapi

The properties of springdoc-openapi

The plugins of springdoc-openapi

Configuring springdoc-openapi

Setting up Swagger UI

Installing and using Swagger UI

Displaying pagination information in Swagger UI

Summary

7

Adding Spring Boot Security with JWT

Technical requirements

Understanding CORS

How CORS works

Adding a CORS policy

CORS applications for each method

CORS applications at the controller level

CORS application at the controller and method levels

Global CORS configuration

Understanding Spring Security

Features of Spring Security

Authentication and authorization in Spring Boot

Configuring Spring Boot and implementing authentication

Creating user endpoints

JWT

IDaaS

Types of IDaaS

Summary

8

Logging Events in Spring Boot

Technical requirements

Getting started with SLF4J and Log4j2

Features of a logging framework

Logging using SLF4J

Methods and classes of SLF4J

Features of SLF4J

Logging using Log4j2

The Log4j2 Logger

Log4j2 Appenders

Log4j2 Layouts

Log4j2 Markers

Log4j2 Filters

Setting up SLF4J and Log4j2

Configuring Logback

Configuring Log4j2

Using logs

Annotations in Lombok

Summary

9

Writing Tests in Spring Boot

Technical requirements

Understanding JUnit and AssertJ

JUnit framework

Assertions in JUnit

Annotations

Using AssertJ

Character assertions

Class assertions

Iterable assertions

File assertions

Map assertions

Writing a test

Testing with the H2 database

Testing a repository

Writing tests in a service using Mockito

Adding behavior

Verifying behavior

Expecting calls

Exception handling

Mockito in Spring Boot

Summary

Part 3: Frontend Development

10

Setting Up Our Angular Project and Architecture

Technical requirements

Organizing features and modules

Generating an Angular project

Angular features

Creating the Angular folder structure

Implementing the structure

Structuring components

Smart and dumb or presentation components

Implementing smart and dumb components in the project

Adding Angular Material

Configuring Angular Material

Implementing Angular Material

Summary

11

Building Reactive Forms

Technical requirements

Understanding reactive forms

The template-driven approach

The reactive approach

Basic form controls

Form control methods

Initializing form controls

Resetting form controls

Listening to events

Grouping form controls

Creating form groups

Creating nested form groups

Creating form arrays

Using the FormBuilder service to generate controls

Validating form input

Built-in validators

Custom validators

Implementing reactive forms in our project

Summary

12

Managing States with NgRx

Technical requirements

Understanding complexities in managing the states of large applications

The flow of data without state management

The flow of data with state management

State management and the global state

Global state/store

Actions

Reducers

Selectors

Effects

Getting started and setting up NgRx

Adding NgRx to our Angular project

Installing NgRx DevTools

Writing an action

Implementing actions in the project

Writing an effect

Writing a reducer

The state interface

The initial state

The reducer function

Writing a selector and using a selector and dispatching it in a component

Selecting root states

Selecting feature states

Implementing selectors in our project

Configuring the store

Runtime checks

Summary

13

Saving, Deleting, and Updating with NgRx

Technical requirements

Removing an item without a side effect using NgRx

Creating the delete action

Creating the delete reducer

Dispatching the action

Removing an item with side effects using NgRx

Creating a new action type

Creating the delete effect

Modifying the dispatch

Adding an item with side effects using NgRx

Creating the actions

Creating the effect

Creating the reducer

Dispatching the action

Updating an item with a side effect using NgRx

Creating the actions

Creating the effect

Creating the reducer

Dispatching the action

Summary

14

Adding Authentication in Angular

Technical requirements

Adding user authentication

The authentication API

The HTTP interceptor

The authentication module

The routing module

Protecting routes

Project implementation

Calling an API

Creating the actions

Creating the effects

Creating the reducers

Creating the selectors

Syncing in local storage

Dispatching and selecting a component

Summary

15

Writing Tests in Angular

Technical requirements

Getting started with Cypress

Installation

Updating the Cypress config file

Writing Cypress tests

Mocking HTTP responses and intercepting HTTP requests

Summary

Part 4: Deployment

16

Packaging Backend and Frontend with Maven

Technical requirements

What is frontend-maven-plugin?

Adding configurations to Spring Boot and Angular’s integration

Adding the Angular app to the Spring Boot project

Using frontend-maven-plugin

Using maven-antrun-plugin

Implementing WebMvcConfigurer

Packaging Spring Boot

Running the JAR file

Summary

17

Deploying Spring Boot and the Angular App

Technical requirements

Understanding GitHub Actions

Components of GitHub Actions

Setting up Heroku

Creating GitHub and Heroku accounts

Creating a new app in Heroku

Adding a Postgres database

Adding system properties

Adding config variables

Manual deployment in Heroku

Creating a CI workflow or pipeline

Summary

Index

Other Books You May Enjoy

Preface

Spring Boot provides JavaScript users with a platform to get an application up and running with just a few lines of code. At the same time, Angular is a component-based framework that makes building a web application’s frontend easy. This book explains how Spring Boot and Angular work together to help you create full-stack applications quickly and effectively.

In this book, you will begin by exploring why Spring Boot and Angular are in-demand frameworks, before being guided by expert solutions and best practices to build your own web application. Regarding the backend, you will see how Spring Boot allows you to build applications efficiently by letting the Spring Framework and Spring Boot extension do the heavy lifting, while using Spring Data JPA and Postgres dependencies in your project to save or persist data in a database. With the frontend, you will use Angular to construct a project architecture, build Reactive forms, and add authentication to avoid malicious users stealing data from the application.

Finally, you will see how to test services with Mockito, deploy applications using continuous integration and continuous deployment, and integrate Spring Boot and Angular to create a single package so that, by the end of the book, you will be able to build your very own full-stack web application.

Who this book is for

The book is for busy Java web developers and TypeScript developers with little experience of developing Angular and Spring Boot apps who want to learn about the best practices for building full-stack web apps.

What this book covers

Chapter 1, Spring Boot and Angular – The Big Picture, serves as a short recap regarding Spring Boot and Angular’s current state to give you a glimpse of what lies ahead in the web development of Java Spring Boot and Angular. You will also see how stable and reliable Vue.js is as an app and the team behind writing and maintaining the Vue.js framework.

Chapter 2, Setting Up the Development Environment, teaches you how to set up your computer’s development environment to build backend and frontend web applications. We will turn to different IDEs and text editors to write the code and make sure everything has been set up before we proceed in the app development.

Chapter 3, Moving into Spring Boot, uncovers the inner workings of Spring Boot and how to start a project using Spring Initializr. This chapter will also teach you about the concept of dependency injection and the IoC container. This chapter will also tackle how Beans and annotations work.

Chapter 4, Setting Up the Database and Spring Data JPA, helps you to connect the Java Spring Boot to a database. This chapter will describe Spring Data JPA and how to add Spring Data JPA and Postgres dependencies in the project. This chapter will also show how to use a config file to connect the Java Spring Boot to a Postgres database instance.

Chapter 5, Building APIs with Spring, shows you how to start and run a Java Spring Boot application. This chapter will also show how to add models for the application and use them when writing routers and controllers. Afterward, this chapter will explain how to use Redis for caching to improve the performance of an application.

Chapter 6, Documenting APIs with OpenAPI Specification, covers the documentation part of the APIs of the Java Spring Boot application. This chapter will also show you how to include the Swagger UI in the application to provide graphical interfaces in the documentation of APIs.

Chapter 7, Adding Spring Boot Security with JWT, details what CORS is and how to add a CORS policy in the Spring Boot application. This chapter describes Spring security, authentication, and authorization. This chapter will also demonstrate how JSON web tokens work and what Identity as a Service (IaaS) is.

Chapter 8, Logging Events in Spring Boot, explains what logging is and what the popular packages to implement logging are. This chapter will also teach you where to save logs and what to do with logs.

Chapter 9, Writing Tests in Spring Boot, is all about writing tests for a Java Spring Boot application. This chapter describes JUnit and AssertJ. This chapter will also teach you how to write tests, how to test a repository, and how to test a service using Mockito.

Chapter 10, Setting Up Our Angular Project and Architecture, focuses on how to organize features and modules, how to structure components, and how to add Angular Material.

Chapter 11, Building Reactive Forms, demonstrates how to build Reactive forms, basic form control, and grouping form controls. This chapter will also explain how to use FormBuilder and validate form input.

Chapter 12, Managing States with NgRx, covers state management in complex applications. This chapter will also introduce NgRx and how to set it up and use it in an Angular application.

Chapter 13, Saving, Deleting, and Updating with NgRx, describes how to remove an item using NgRx, how to add an item using NgRx, and how to update an item using NgRx.

Chapter 14, Adding Authentication in Angular, explores how to add user login and logout, retrieve user profile information, protect application routes, and call an API with protected endpoints.

Chapter 15, Writing Tests in Angular, illustrates how to write basic Cypress tests and how to mock HTTP requests for testing.

Chapter 16, Packaging Backend and Frontend with Maven, exemplifies how to utilize the Maven frontend plugin for Angular and Spring Boot to integrate them into one package.

Chapter 17, Deploying Spring Boot and the Angular App, describes CI/CD and GitHub Actions. This chapter will also show you how to create a CI workflow or pipeline for a Spring Boot and Angular application.

To get the most out of this book

You should ensure that you have a basic understanding of HTML, CSS, JavaScript, TypeScript, Java, and REST API. You don’t need intermediate or advanced knowledge of the requirements mentioned.

Software/hardware covered in the book

Operating system requirements

Node.js (LTS version)

Windows, macOS, or Linux

Angular

Windows, macOS, or Linux

Java 17

Windows, macOS, or Linux

Visual Studio Code

Windows, macOS, or Linux

IntelliJ IDEA

Windows, macOS, or Linux

Google Chrome

Windows, macOS, or Linux

Don’t lose hope if you are facing problems when installing runtimes, SDKs, or any software tools in general when developing an application. Errors are common, but searching for error messages on Google greatly helps developers when troubleshooting certain problems.

If you are using the digital version of this book, we advise you to type the code yourself or access the code from the book’s GitHub repository (a link is available in the next section). Doing so will help you avoid any potential errors related to the copying and pasting of code.

Play around with Angular on stackblitz.com or codesandbox.io to see the look and feel of Angular without installing anything on your computer.

Download the example code files

You can download the example code files for this book from GitHub at https://github.com/PacktPublishing/Spring-Boot-and-Angular. If there’s an update to the code, it will be updated in the GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots and diagrams used in this book. You can download it here: https://packt.link/pIe6D.

Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “Spring Boot only requires spring-boot-starter-web, which is a Spring Starter, for our application to run.”

A block of code is set as follows:

@Configuration public class AppConfig {    @Bean    public Student student() {        return new Student(grades());     }    @Bean    public Grades grades() {       return new Grades();     } }

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

dependencies {    implementation 'org.springframework.boot:spring-boot-    starter-data-jpa'    runtimeOnly 'com.h2database:h2'   runtimeOnly 'org.postgresql:postgresql' }

Any command-line input or output is written as follows:

rpm -ivh jdk-17.interim.update.patch_linux-x64_bin.rpm

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Select Spring Initializr and this will open a form with the same web interface.”

Tips or important notes

Appear like this.

Get in touch

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Errata: Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you have found a mistake in this book, we would be grateful if you would report this to us. Please visit www.packtpub.com/support/errata and fill in the form.

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Part 1: Overview of Spring Boot and Angular Development

This part contains a real-world scenario on how to start a web application project. The following chapters are covered in this part:

Chapter 1, Spring Boot and Angular – The Big PictureChapter 2, Setting Up the Development Environment

2

Setting Up the Development Environment

In the previous chapter, you learned about Spring Boot in a nutshell and its advantages. We also tackled the latest features of Java 17. The same goes for Angular; you had an overview of Angular and the benefits of using it to develop frontend applications.

This chapter will teach you how to set up your computer’s development environment to develop your full-stack Java and Angular application. We will tackle different IDEs and text editors to write our code and make sure everything has been configured before we start with the development.

Installing everything correctly from the beginning will help us avoid issues and write code without any interruptions.

In this chapter, we will cover the following topics:

Installing VS Code and IntelliJ IDEAInstalling Java 17Installing SDKMANSetting up IntelliJ IDEA with Java 17Installing REST Client VS Code or JetBrains and Angular DevToolsInstalling Git version control

Technical requirements

The following are the links to the software you need to install:

Download VS Code (for Windows, Mac, and Linux): https://code.visualstudio.com/downloadIntelliJ IDEA for Windows: https://www.jetbrains.com/idea/download/#section=windowsIntelliJ IDEA for Mac: https://www.jetbrains.com/idea/download/#section=macIntelliJ IDEA for Linux: https://www.jetbrains.com/idea/download/#section=linuxDownload Java 17: https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.htmlAngular DevTools: https://chrome.google.com/webstore/detail/angular-devtools/ienfalfjdbdpebioblfackkekamfmbnhNode.js and Node Package Manager: https://nodejs.org/en/PostgreSQL for Windows: https://www.postgresql.org/download/windows/PostgreSQL for Mac: https://www.postgresql.org/download/macosx/PostgreSQL for Linux: https://www.postgresql.org/download/linux/Git Version Control: https://git-scm.com/

Installing VS Code and IntelliJ IDEA

This section will guide you through the installation and configuration of VS Code or IntelliJ IDEA. We will look at the text editor and IDE breakdown of their features and plugins that you can use throughout the development.

VS Code

Download the VS Code installer from https://code.visualstudio.com/download. We suggest installing VS Code regardless of your machine’s OS, because VS Code is lightweight but offers many plugins for Angular development. In addition, VS Code is the most common text editor used by JavaScript developers. The editor supports TypeScript, code formatting, and code navigation and offers many extensions that you can use, especially in developing Angular applications. The following are some of the valuable extensions we can use throughout the development:

Code Spell Check: This is an extension for checking the spelling of our source code, which helps us avoid issues caused by typos.Prettier: This is a code formatting tool that applies proper alignment and indentations on our file after each save.Angular Snippets: This is a prevalent extension for Angular developers as it adds snippets for Angular, TypeScript, and HTML, which saves much time in development with the use of snippets to generate codes on the fly.Angular Files: This is a valuable extension, especially when you are not familiar with the commands in the Angular CLI; this extension will add a menu where you can generate Angular components, modules, and services without using a CLI.Angular2-Switcher: This extension allows us to use shortcut keys to navigate between Angular files.REST Client: This is an extension in VS Code for testing backend APIs. Instead of using third-party applications, we can send requests on our VS Code using REST Client.JSON to TS: This extension is handy as it automatically converts JSON objects into TypeScript models in our frontend.Angular Language Service: This is one of the essential plugins for Angular development. The extension provides Angular Code Completion, Angular Diagnostic Messages, and Go to definition features that make development faster.

This ends VS Code installation and configuration. Your VS Code text editor is now set for Angular development.

IntelliJ IDEA

This IDE is one of the most popular IDEs when developing applications using Java. The IDE offers several features to make development easier and faster. The following is a list of the tools that IntelliJ IDEA offers:

Terminal: IntelliJ IDEA comes with a built-in terminal. We can execute any commands in the terminal depending on the language we are using for the development. The terminal can be accessed by pressing Alt + F12.Quick fixes: IntelliJ IDEA detects syntax errors on the fly. Having this feature, IntelliJ IDEA also suggests quick fixes for developers to easily correct mistakes in the code. The quick fixes can be accessed through a small light bulb that appears when IntelliJ IDEA detects an error.IntelliSense: IntelliSense is also known as smart code completion. IntelliJ IDEA analyzes the fragments of code and displays suggestions to complete the code on the fly.Advanced refactoring: IntelliJ IDEA offers a wide range of refactoring options. The IDE gives the developer the capability to refactor code automatically. Refactoring can also be accessed in the refactor menu.Navigation and search: This is one of the most used features of IntelliJ IDEA and is very handy, especially with large projects. It helps developers find and navigate for a resource, and it can search all of the available controls in the IDE.Detecting duplicates: This helps developers find duplicates in code and gives suggestions to the developers.

You should go to https://www.jetbrains.com/idea/download/ to download the installer. In addition, you can download the community version, which is the free version of Visual Studio.

After successfully downloading the IDE, run the installer, and the process is very much straightforward. It will install the IDE automatically in our terminal. After the successful installation of IntelliJ IDEA, we will install plugins/extensions that will help us throughout the development.

To install the plugins, open the IntelliJ IDEA and press Ctrl + Alt + S. This will open the settings