Use Javax Inject to achieve the method of dependent injection

Use Javax Inject to achieve the method of dependent injection Dependent injection is a common software development and design mode that can decoup and simplify the complexity of the code, and improve the testability and maintenance of code.Javax Inject is a developer API used in Java to achieve the dependent injection. It provides a set of annotations and interfaces to define and identify dependency relationships, and automatically instance and inject corresponding dependencies. When using Javax Inject to achieve dependent injection, we need to follow the following steps: 1. Add dependencies: First, we need to add dependencies in the project to use Javax Inject.You can add the following dependencies in the project construction tool (such as Maven or Gradle): <dependency> <groupId>javax.inject</groupId> <artifactId>javax.inject</artifactId> <version>1</version> </dependency> 2. Identity dependencies: Next, we need to identify the dependencies that need to be injected.You can use the annotation `@inject` to identify the fields or methods or methods that you want to depend on injection. public class UserService { @Inject private UserRepository userRepository; // ... } In the above examples, `UserRePOSITORY` is identified as members who need to be relying on injection. 3. Configuration dependency injection container: Next, we need to configure dependent injection containers to support dependencies.A common method is to use Java's carrying framework, such as Spring Framework or Google Guice.These frameworks usually provide a container to manage dependency injection, and automatically instantiated and injected the logo dependence. Using Spring Framework as an example, you can create an application configuration class, which contains the dependent items required.Use the@bean` annotation on the configuration class, and use the@inject` annotation to introduce the `@bean` method. @Configuration public class AppConfig { @Inject private UserRepository userRepository; @Bean public UserService userService() { return new UserService(userRepository); } // ... } In the above examples, `userRepository` is injected into the` userService`, and through the@bean` method, it is routinely turned into a bean. 4. Use dependencies: Now, we can directly use the `@inject` annotation where we need to use dependencies to obtain an instance of dependencies. public class UserController { @Inject private UserService userService; // ... } In the above examples, `UseRService` is injected into the` UserController`, we can directly use the `userService` object to operate. In summary, the use of Javax Inject to achieve dependent injection can help us better manage the coupling dependencies.By using the `@inject` annotation logo dependency item, and cooperate with the configuration of the injecting container, we can realize the automatic instance and injection of dependencies.This method can improve the maintenance of the code and testability, and better support the reuse and dynamic coupling of the code.