[Spring] @Component

@Component

@Component is an annotation that allows Spring to detect our custom beans automatically.

In other words, without having to write any explicit code, Spring will:

• Scan our application for classes annotated with @Component
• Instantiate them and inject any specified dependencies into them
• Inject them wherever needed

However, most developers prefer to use more specialized stereotype annotations to serve this function.

→ Spring has provided a few specialized stereotype annotations: @Controller, @Service and @Repository.

They all provide the same function as @Component.

 

They all act the same because they are all composed annotations with @Component as a meta-annotation for each of them. 

 

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출처: https://www.baeldung.com/spring-component-annotation