Spring Boot Annotations

October 8, 2024

Annotations

1. @SpringBootApplication

The @SpringBootApplication annotation is a key entry point for Spring Boot applications. It combines three essential annotations:

@Configuration: Indicates that the class can be used by the Spring IoC container as a source of bean definitions.
@EnableAutoConfiguration: Enables Spring Boot’s auto-configuration feature, which automatically configures your application based on the dependencies in the classpath.
@ComponentScan: Allows Spring to scan for components, configurations, and services in the specified packages.

2. @EnableAutoConfiguration

The @EnableAutoConfiguration annotation automatically configures your Spring application based on the classpath and other beans. It eliminates the need for manual configuration, allowing developers to focus on building features rather than configuring the framework.

3. @SpringBootConfiguration

This annotation indicates that a class provides Spring Boot-specific configurations. It acts as a specialized form of the @Configuration annotation, making it clear that the class is intended for Spring Boot applications.

4. @ComponentScan

The @ComponentScan annotation specifies the packages that Spring should scan for components, configurations, and services. This helps in organizing your code and managing dependencies efficiently.

5. @RestController and @Controller

These annotations are used for defining web controllers in Spring MVC:

@RestController: Combines @Controller and @ResponseBody, indicating that the controller methods will return data directly in the response body.
@Controller: Used to define a traditional MVC controller that returns views.

6. @ResponseBody

The @ResponseBody annotation indicates that the return type of a method should be written directly to the HTTP response body. It is commonly used in RESTful web services to return JSON or XML data.

7. @PathVariable and @RequestParam

These annotations are used to bind method parameters to URL variables and request parameters:

@PathVariable: Binds a method parameter to a URI template variable.
@RequestParam: Binds a method parameter to a request parameter.

#SpringBoot #spring #annotations

christova

SpringBoot