Скачать или смотреть @Component Explained! What It Is & Why It Matters | Spring Boot Series #1

In this video, we are going to discuss about the @component annotation .
Spring Annotation
Spring Boot Annotation
@component
It is a marker for any Java class that Spring manages and treats as a bean with this you’re telling the Spring Framework that an instance of this class should be kept in the ApplicationContext.- @Component is a class-level annotation.
It is used to denote a class as a Component. - It tells Spring container to create a bean automatically for a particular class.- A component is responsible for some operations. - Spring framework provides three other specific annotations to be used when marking a class as a Component.

@Service
@Repository
@Controller

The @Component annotation in Spring (a popular Java framework) is used to indicate that a class is a Spring-managed component. When Spring sees this annotation during component scanning, it automatically detects and registers the class as a bean in the application context.

import org.springframework.stereotype.Component;

@Component
public class MyService {
public void doSomething() {
System.out.println("Doing something...");
}
}

Part of Stereotype Annotations: @Component is the generic stereotype. Spring also provides:

@Repository – for DAO components

@Service – for service layer classes

@Controller – for web controllers (used in Spring MVC)

These are functionally similar to @Component but serve for semantic clarity.

Component Scanning: Spring needs to scan the package to detect @Component classes. This is typically enabled with @ComponentScan or via @SpringBootApplication, which includes component scanning.

java
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@SpringBootApplication
public class MyApp {
public static void main(String[] args) {
SpringApplication.run(MyApp.class, args);
}
}
Scope: By default, Spring beans are singleton-scoped. You can change the scope like this:

java
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@Component
@Scope("prototype")
public class MyPrototypeBean { }
✅ Summary
Feature Description
Purpose Marks a class as a Spring-managed component
Detected by Spring's component scanning
Commonly used with @Autowired, @ComponentScan
Alternatives @Service, @Repository, @Controller