What are the primary annotations included in a Spring Boot application?
A Spring Boot application contains the following meta-annotations:
- @SpringBootApplication is an annotation used to mark the main class of a Spring Boot application, which is used to launch the Spring Boot application. It is a composite annotation that includes @ComponentScan, @EnableAutoConfiguration, and @Configuration annotations.
- @Configuration: Annotates a class as a configuration class, replacing the traditional XML configuration files.
- @EnableAutoConfiguration: Enables the automatic configuration mechanism to automatically configure Spring Beans based on dependencies on the classpath.
- @ComponentScan: specifying the package paths to scan in order to find Spring components such as Controller, Service, and Repository.
- @RestController: Marks a class as a controller following the RESTful style, used to handle HTTP requests and responses.
- @RequestMapping: Maps a method to a path in an HTTP request.
- @Autowired: Automatically inject dependencies into a class by matching type and injecting the Spring Bean.
- @Value: Injecting values from external configuration files.
- @Bean: Annotate a method as a Spring Bean so that the container can manage its lifecycle.
- @Component: Marks a class as a Spring component, used for automatic scanning and registration as a Bean.
- @Repository: Tagging a class as a Spring component for the data access layer.
- @Service: Annotates a class as a Spring component for the business logic layer.
- @Controller: Identifying a class as a Spring component for the controller layer.
- @ConfigurationProperties: Bind the properties of the configuration file to the fields of a class.
- @EnableSwagger2: Enables Swagger2 for generating API documentation.
These meta-annotations are commonly used annotations in Spring Boot applications, designed to configure and manage Spring Beans, as well as handle requests and responses.
