Full Stack AngularJS for Java Developers (eBook)

Ravi Kant Soni is a Full Stack Java Application Developer and published author of two books, Learning Spring Application Development and Spring: Developing Java Applications for the Enterprise. He completed his bachelor degree (B.E) in information science and engineering from Reva University, Bangalore (India), and schooling from Bal Vikash Vidyalaya, Sasaram, Bihar (India). He is from Lashkariganj (near “Sher Shah Suri” Tomb), Sasaram, Bihar (India).Currently, Ravi is working as a Technical Manager. He has worn many hats throughout his tenure, ranging from software development to multi-tenant application design to integration of new technology into an existing system to writing books. He has focused on full stack web application development for most of his career and has been extensively involved in application design and implementation. He has developed applications for banking systems, HR and payroll systems, and e-commerce systems, and also has gained recognition from management for his designing abilities for a premium program. He is well-versed in all aspects of software engineering, including software design, systems architecture, application programming, and automation testing. Ravi loves problem statements and enjoys brainstorming unique solutions.

Contents 6
About the Author 11
About the Technical Reviewer 12
Acknowledgments 13
Chapter 1: The Big Picture of Full Stack Web Development 14
What Is a Full Stack Developer? 14
Full Stack Web Development 16
Architecture of Modern Web Applications 17
Front End vs. Back End 19
Front-End Framework 20
AngularJS as a Front-End Framework 20
AngularJS Version 20
AngularJS Architecture Concepts 21
MVC Architecture 22
Twitter Bootstrap 23
Back-End Framework 23
Spring Boot as a Back-End Framework 23
Spring Framework Problems and Spring Boot Advantages 24
Primary Goals of Spring Boot 24
Develop Your First Spring Boot Application 25
System Requirements 25
Using the Spring Boot CLI 25
Using Spring Initializr 25
Using Spring Tool Suite 28
A Walk-Through of the Code 31
Looking at pom.xml 31
Writing the Code 35
@SpringBootApplication Annotation 35
@RestController and @RequestMapping Annotations 36
The main Method 36
Running a Spring Boot Application in STS 36
Starters 38
Spring Boot Actuator: Production-Ready Features 38
Enabling Actuator 38
Running the Application 39
Using Actuator Endpoints 39
Customizing the Management Server Port 39
Getting Health Information 40
Summary 40
Chapter 2: Creating the RESTful Layer for Your Application 41
Introduction to REST 41
HTTP Methods and CRUD Operations 41
HTTP Status Codes 42
Build a RESTful Service: UserRegistrationSystem 42
Introducing UserRegistrationSystem 42
Identifying REST Endpoints 43
JSON Format 43
Creating the UserRegistrationSystem Application 44
Embedded Database: H2 45
Domain Implementation: Users 45
Repository Implementation: UserJpaRepository 46
Build a RESTful API 47
Create a RESTful Controller: UserRegistrationRestController 49
@GetMapping: Retrieve All Users 50
@PostMapping: Create a New User 51
@GetMapping ("/ {id}"): Retrieve an Individual User 52
@PutMapping: Update a User 53
@DeleteMapping: Delete a User 54
Handle Errors in a RESTful API 55
UserRegistrationSystem Error Handling 55
Custom Error Response 57
Validating Request Body 59
Adding the Bean Validation Annotations 59
@Valid on @RequestBody in UserRegistrationRestController Method Arguments 61
ValidationError and Updated ErrorDetail Classes 63
Handling Exceptions Using the @ControllerAdvice Annotation 65
Externalizing Error Messages 67
Create ReloadableResourceBundleMessageSource Bean: messageSource 67
Create a Properties File 68
Bean Validation Annotation with the message Attribute 69
Reading Messages from the Properties File 70
Summary 72
Chapter 3: Setting Up AngularJS: Creating Your Single-Page Application 73
Introducing AngularJS as a Front-End Framework 73
AngularJS Basic Components 74
AngularJS Life Cycle 74
Bootstrap Phase 75
Compilation Phase 75
Runtime Data Binding Phase 75
AngularJS Architecture Concepts 75
MVC Architecture 76
Setting Up Your Development Environment 78
Adding AngularJS to Spring Boot 78
Including Angular Scripts from the Google CDN 78
Downloading and Hosting Angular Files Locally 79
Providing Dependency Information in pom.xml 80
Adding Twitter Bootstrap to Spring Boot 81
Developing Your Single-Page Application 81
Bootstrapping the Application 82
Dependency Injection 82
AngularJS Routes 83
AngularJS Templates 83
Implementing the Model, View, and Controller in Your Single-Page Application 84
Create the Home/Application Page 85
Create the View Pages 87
Home Page 87
Register New User Page 88
List of Users 91
Update Existing User 93
Create an AngularJS Application 95
Create an AngularJS Controller 96
Running a Spring Boot Application in STS 98
Summary 104
Chapter 4: Securing Your RESTful API Using Spring Security 105
Introducing Spring Security 105
Authentication and Authorization 105
Introducing Basic Authentication 106
BasicAuthenticationFilter 106
Enabling Spring Security on RESTful Services 106
What Is the Spring Boot Security Starter? 107
Updating the pom.xml File with the Spring Security Dependency 107
Overriding the Spring Security Defaults 110
Customizing User Authentication 112
Authentication Customization with an In-Memory Definition 113
Running the UserRegistrationSystem Application 114
Authentication Customization Against a Relational Database 119
UserDetailsService Implementation 121
Customizing Spring Security and Securing the URI 122
Method-Level Security 124
Summary 125
Chapter 5: Consuming Secured RESTful Services Using AngularJS 126
Enabling Basic Authentication in Spring Security 126
Sending an Authorization Header with Each Request in AngularJS 128
Adding the HTTP Interceptor in AngularJS 128
authInterceptor.js 129
Updating app.js 130
Updating index.html 130
Running the Application 131
HTTP Request with Basic Authentication Header: Verify in Developer Tools 132
The Login Page 133
Updating index.html: Adding Navigation to the Welcome Page 134
Updating app.js: Adding Navigation to the Angular Application 135
Creating login.html: The Login Form 136
Updating controller.js for the Login and Logout Authentication Process 138
Updating the Back-End Code 140
Creating a New RESTful Endpoint to Get the Currently Authenticated User 140
Updating the Spring Security Configuration to Handle Login Requests 141
Running the Application 142
Summary 144
Chapter 6: Building a RESTful Client and Testing RESTful Services 145
Building a REST Client Using RestTemplate 145
RestTemplate 145
RestTemplate Method 146
RestTemplate Operation 146
HTTP GET Request with Parameter to Retrieve User 146
HTTP POST Request with JSON Data to Create an User 149
HTTP PUT Request with Parameter to Update User 150
HTTP DELETE with Parameter to Delete User 152
The RestTemplate Exchange API 153
Basic Authentication with RestTemplate 154
Testing RESTful Services Using the Spring Test Framework 155
What Is Testing? 155
Testing Using JUnit4 156
JUnit 4 Annotations 156
JUnit 4 Assert Methods 156
Example: Implementing JUnit 4 157
Agile Software Testing 159
Unit Testing 160
Unit Testing for the Dependent Class with a Mocking Object 160
The Mockito Framework 161
Integration Testing 161
Testing the Spring Boot Application 162
Maven Dependency 162
Annotations in Spring Testing 162
Unit Testing REST Controller 164
Testing the Web Layer Using the Spring MVC Test Framework 166
MockMvc 166
Summary 170
Chapter 7: Application Monitoring Using Spring Boot Actuator 171
Introducing Spring Boot Actuator 172
Enabling the Actuator Module 172
Actuator Endpoints 173
/info 174
/env 175
/metrics 175
/trace 177
/health 178
Customizing an Actuator Endpoint 178
Properties to Customize 179
Custom Health Indicator 180
Defining New Endpoints 182
Management Over HTTP 183
Customizing the Server Port 183
Accessing a Sensitive Endpoint 184
Summary 184
Appendix A:Tools for Accessing REST APIs 185
API Testing 185
API Testing Tools 185
Postman 185
Functions in Postman 188
Request URL 188
HTTP Method 188
Parameters 189
Authorization 190
Headers 190
Body 191
Send 191
Response Message 191
Body 192
Cookies 192
Headers 192
Tests 192
Other Features 193
Index 194