AUTORE framework in the Java library

The Autowire framework is a dependent injection (Dependency Inject) framework commonly used in the Java library.Dependent injection is a design pattern that is used to decouple and improve the testability of code.Autowire framework helps developers automatically manage the dependence between modules, and inject dependencies into the corresponding class during runtime. The following is a guide to use the Autowire framework in the Java library: 1. Introduce the autowire library First, you need to introduce the dependencies of the autowire library in the construction document of the project.You can add the following dependencies to Maven or Gradle: Maven： <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>{version}</version> </dependency> Gradle： groovy compile group: 'org.springframework', name: 'spring-context', version: '{version}' Make sure {verse} replace it with a specific autowire version number. 2. Create dependence in injection classes Creation in the project that needs to be rely on injection.These classes can be service, controller, repository or any other components.Add @Autowire annotations to member variables, constructing functions or setter methods that need to be automatically injected. public class UserService { @Autowired private UserRepository userRepository; // ... } public class UserController { private UserService userService; @Autowired public UserController(UserService userService) { this.userService = userService; } // ... } In the above example, UserRePOSITORY will be automatically injected into the UserService class, and UserService will be automatically injected into the UserController class. 3. Configure Autowire framework Now, you need to configure a context to manage the creation and injection of the autoWire framework.Configure in the Java configuration class or XML configuration file. Java configuration class example: @Configuration @ComponentScan(basePackages = "com.example") public class AppConfig { // Configure other bean ... @Bean public UserRepository userRepository() { return new UserRepositoryImpl(); } // ... } In the above example, you can see the use of @ComponentScan annotations to scan all components under the specified package for dependence injection.Through @Bean annotation, the UserRePOSITOMPL class can be created as a bean, and it is automatically injected when needed. XML configuration file example: <context:component-scan base-package="com.example" /> <bean id="userRepository" class="com.example.UserRepositoryImpl" /> <!-More configuration ...-> The XML configuration file above is a component package that specifies the <stan: Component-SCAN> element, and configures the UserRePOSITOLYIMPL class to a bean through the <stan> element. 4. Start the application Once the Autowire framework is configured, you can start the application and test whether the dependency item that is automatically injected automatically.The Autowire framework will scan the specified package, create the corresponding bean, and automatically inject it into the corresponding class. public class Main { public static void main(String[] args) { ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class); // Obtain instance of the dependencular injection class as needed UserController userController = context.getBean(UserController.class); // Use dependence in injection classes userController.doSomething(); } } In the above example, use AnnotationConfigApplicationContext as the context to load the configuration class.Then use the Getbean method to obtain an instance of UserController from the context, and then you can use a dependent injection class. Summarize: Using the Autowire framework can simplify the dependency injection process in the Java class library.By using the @Autowire annotation, you can automatically inject dependencies and manage the dependencies through the context configuration of Spring.This method can improve the testability and maintainability of the code, while reducing the coupling between modules.