Springsource javax annotation comments on common usage analysis

Springsource javax annotation comments on common usage analysis In the Spring framework, it plays a very important role. They can help developers more flexibly configure the application and improve the readability of the code.The Javax annotation in the Spring framework is also a very common annotation, which has rich functions and usage.In this article, we will introduce the common usage of SpringSource Javax Annotation annotation to help developers better understand and apply these annotations. Common SpringSource Javax Annotion Note includes: 1. @Autowired: Used to automatically assemble Bean's annotations, which can be matched through the type, or specify a specific bean by @qualifier. 2. @component: Used to mark the class, indicating that this class will be automatically scanned and registered as bean by Spring. 3. @Controller: Used to mark the controller class, usually used in Spring MVC. 4. @Service: Used for labeling service classes, usually for business logic layers. 5. @Repository: Used to mark the data access class, usually used for data access layers. Below we will introduce the common usage of these annotations. 1. @Autowired @Autowired annotation can be used in fields, constructors, and setter methods to achieve dependent injection by automatic assembly Bean.When using the @Autowired annotation, you can use the required property settings whether to allow it to be allowed as a vacant value, and default to TRUE.For example: @Autowired(required = false) private UserService userService; 2. @Component @Component annotations are used to mark the class, indicating that this class will be automatically scanned and registered as bean by Spring.You can specify the name of the bean through the value attribute.For example: @Component("userService") public class UserService { //... } 3. @Controller @Controller's annotation is used in the category controller class, which is usually used in the Spring MVC framework.For example: @Controller public class UserController { //... } 4. @Service @Service Note is used for labeling service classes and is usually used for business logic layers.For example: @Service public class UserService { //... } 5. @Repository @Repository annotation is used to mark the data access class, which is usually used for data access layers.For example: @Repository public class UserDao { //... } The above is the common usage analysis of SpringSource Javax Annotion.Through reasonable application of these annotations, developers can manage and configure Spring applications more easily, and improve the readability of code.I hope this article will help you, thank you for reading!