Spring Configuration Options
- Spring beans are picked up by 'Component Scans'
- The refers to the class level annotation
- When a SpringBoot app does a component scan, it looks at that package and down.
- Class level annotation: @Controller, @Service...etc
Spring Stereotypes
- Spring Stereotypes are used to defined Spring Beans in the Spring Context
- Stereotypes availables:
- @Controller
- @RestController
- @Component
- @Service
- @Repository
These are used to express the intent.
| Annotation | Description |
|---|---|
| @Component | Indicates that an annotated class is a 'component' and it will be created as a bean |
| @Repository | Works exactly the same as @Component but it is used to express the intent that it is a Database Layer |
| @Service | Works exactly the same as @Component but it is used to express the intent that it is a Service Layer |
| @Controller | Indicates that an annotated class has the roles of a Spring MVC "Controller" |
| @RestController | Convenience Annotation which extends @Controller and adds @ResponseBody - @ResponseBody is used to convert Java Objects into Json/XML |
Component Scan
- Component Scan is a way for Spring to look at your package structure and find Spring Beans. \
- It will look for classes annotated with Spring Annotation eg @Service..etc
@SpringBootAnnotation
Includes the following:
- @Configuration - Declares class as Spring Configuration
- @EnableAutoConfiguration - Enable auto configuration
- @Component Scan - Scans for components in current package and all child packages