What are the commonly used annotations in Spring?

Commonly used annotations are: 1. @Component; 2. @Repository; 3. @Service; 4. @Controller; 5. @Configuration; 6. @Autowired; 7. @Qualifier; 8. @Value; 9. @Bean; 10. @Scope; 11. @PostConstruct; 12. @PreDestroy; 13. @Aspect; 14. @Transactional

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There are many commonly used annotations in the Spring framework, which are used to simplify configuration, manage components, implement AOP, etc. The following are some commonly used Spring annotations:

1. @Component: A common component annotation, used to identify a Spring-like component so that Spring can scan and manage it as a Bean.

2. @Repository: Used to identify a class as a data access layer component, usually used for DAO classes.

3. @Service: Used to identify a class as a business logic layer component, usually used for Service classes.

4. @Controller: Used to identify a class as a controller component, usually used for the Controller class in Spring MVC.

5. @Configuration: Used to identify a class as a configuration class, usually used together with the @Bean annotation to replace the xml configuration file.

6. @Autowired: Used to automatically assemble beans and can be used on fields, constructors, and Setter methods.

7. @Qualifier: Used with @Autowired to specify the name of the injected Bean.

8. @Value: Used to inject attribute values, which can be used in fields, constructors, and methods.

9. @Bean: Used to define Bean, usually used in classes annotated with @Configuration.

10. @Scope: Used to define the scope of Bean, such as singleton, prototype, etc.

11. @PostConstruct: Used to specify the initialization method, which is called after the Bean is initialized.

12. @PreDestroy: Used to specify the destruction method, which is called before the Bean is destroyed.

13. @Aspect: Used to define aspects, combined with other annotations such as @Before, @After, etc. to implement AOP functions.

14. @Transactional: Used to declare transactions, usually used in Service layer methods.

These annotations can help developers simplify configuration and improve code readability and maintainability. They are commonly used annotations in the Spring framework.

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