Building a Spring Boot Blogging Platform REST Service
Updated: Apr 26, 2023
Implementing Inversion of Control (IoC) principle using Dependency Injection pattern:
Spring Framework provides a powerful implementation of the IoC principle, which is based on the Dependency Injection (DI) pattern. DI enables you to write loosely coupled code by decoupling the creation and wiring of objects from their usage.
Spring provides two types of DI:
Constructor-based dependency injection: In this type of DI, dependencies are injected into the constructor of a class.
Setter-based dependency injection: In this type of DI, dependencies are injected using setter methods.
Using different forms of configuration metadata with the Spring container:
Spring supports different forms of configuration metadata for configuring the Spring container, including:
Java-based configuration: Using Java classes annotated with @Configuration to define beans and their dependencies.
Annotation-based configuration: Using annotations like @Component, @Service, @Repository, and @Autowired to define beans and their dependencies.
XML-based configuration: Using XML files to define beans and their dependencies.
Injecting collaborating beans into another bean using annotations-driven Dependency Injection feature @Autowired:
@Autowired is an annotation-driven DI feature in Spring that enables you to inject collaborating beans into another bean automatically, without the need for explicit wiring.
Building REST services with Spring & Spring Boot:
Spring Boot provides a simple way to build RESTful web services using Spring MVC. You can create RESTful endpoints using @RestController annotation, which combines @Controller and @ResponseBody annotations.
Using Spring Boot key features: Embed Tomcat, Bootstrapping Spring Boot project with Spring Initializr:
Spring Boot provides several key features, including:
Embedded Tomcat: Spring Boot includes an embedded Tomcat server, which makes it easy to deploy your web application as a standalone executable JAR file.
Spring Initializr: Spring Initializr is a web-based tool that helps you bootstrap a new Spring Boot project with all the necessary dependencies and configurations.
Simplifying application build configuration with 'starter' dependencies and Configuring Spring and 3rd party libraries automatically:
Spring Boot provides a set of 'starter' dependencies that simplify the configuration of your application by automatically configuring Spring and third-party libraries. You can include these starter dependencies in your project's build configuration file (e.g., pom.xml for Maven) to add the necessary dependencies.
Reducing boilerplate code with project Lombok:
Project Lombok is a library that helps you reduce boilerplate code in your Java code. It provides annotations like @Getter, @Setter, @NoArgsConstructor, @AllArgsConstructor, etc., which generate the corresponding methods automatically during the compilation process.
Using a build system that supports dependency management and that can consume artifacts published to the “Maven Central” repository:
Spring Boot applications are typically built using a build system that supports dependency management, such as Maven or Gradle. These build systems can consume artifacts published to the Maven Central repository, which is a public repository of Java libraries and dependencies.
Using @ComponentScan to find beans & wire up dependencies using constructor injection (recommend):
@ComponentScan is an annotation that enables Spring to scan for components (i.e., classes annotated with @Component, @Service, @Repository, etc.) in your application and automatically wire up their dependencies using constructor injection.
Simplifying API development with Swagger:
Swagger is an open-source tool that simplifies the development of RESTful APIs by providing a framework for describing, producing, consuming, and visualizing RESTful web services. You can use Swagger with Spring Boot to generate API documentation automatically. API documentation: http://localhost:8080/swagger-ui/index.html
Spring Data JPA & H2 Integration
Spring Data JPA is a powerful framework that simplifies the implementation of JPA-based repositories. It provides a set of high-level abstractions for common repository operations, such as CRUD operations, pagination, and sorting. You need to include the necessary dependencies for Spring Data JPA & H2 in your project, next, you need to configure Spring Data JPA to use H2 as the underlying database. This can be done by adding the following properties to your application.properties file.
Spring Boot 3.0 Security
Using the userDetailsManager and securityFilterChain methods in Spring Boot's simple Spring Security allows for a comprehensive user authentication and authorization system. The userDetailsManager allows for storing user details and credentials in a persistent data store, such as a database, while the securityFilterChain method enables the configuration of security filters for protecting resources based on access rules. Together, these methods provide a complete solution for user authentication and authorization, including features such as password hashing, role-based access control, and login/logout functionality. This approach is straightforward and widely used in Spring Boot applications for securing web resources.
NOTE: Provide Blog User credentials in the Authorization header in Postman to test API endpoints and when you want to visualize REST Endpoints exposed by Swagger or when you access H2 database admin.
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