Scala Guice: Provide a complete guide to Java library to rely on injection

Scala Guice: Provide a complete guide to Java library to rely on injection Dependent injection is a software design mode that is used to realize the dependency relationship between components of loose coupling.SCALA Guice is a dependent injection framework for SCALA language, which can provide the Java class library with a function of dependent injection.This article will introduce you to the use of the Scala Guice framework and provide some Java code examples. In order to start using Scala Guice, you need to introduce the corresponding dependence.Add the following dependencies to the construction document of the project: scala libraryDependencies += "net.codingwell" %% "scala-guice" % "4.2.3" Next, you need to create a module dependent in injection.The module will be used to configure the dependent injection container and tell the SCALA Guice how to create and manage instances.The following is a simple module example: import net.codingwell.scalaguice.ScalaModule class MyModule extends ScalaModule { override def configure(): Unit = { bind[MyService].to[MyServiceImpl] bind[MyRepository].to[MyRepositoryImpl] } } In the above example, we bind the `MyService` interface to the` myServiceImpl` implementation class, and the `MyRPOSITORY` interface to the` MyRPOSITORYIMPL`.In this way, when the `MyService` or` MyRPOSITORY` instance is needed, the Scala Guice will create a corresponding instance based on the configuration. Next, create a GUICE container at the inlet point of the application and add the module to the container: import net.codingwell.scalaguice.InjectorExtensions._ val injector = Guice.createInjector(new MyModule) Now you can use Scala Guice to get an instance of dependencies injected.For example, assuming you want to use the `MyService` and` MyRPOSITOSITOSITOSITOSITORY` in a controller class: class MyController @Inject() (myService: MyService, myRepository: MyRepository) { // ... } In the above example, we used the@inject` annotation to inform the Scala Guice. We hope to inject the `MyService` and` MyRPOSITORY` in the `MyController` class.When we create an instance of the `MyController` in the application, the Scala Guice will automatically analyze and inject the instances of` MyService` and `MyRPOSITORY. In addition to basic dependency injection, SCALA Guice also provides some other features, such as single -case binding, naming binding, and constructor parameter binding.You can learn more about these characteristics in the official documentation. To sum up, SCALA Guice is a powerful dependent injection framework that can help you achieve the dependencies between loose coupling components when using the Java class library.Configure the dependent injection container by creating a module, and use the@inject` annotation to mark the dependencies that need to be injected. You can easily use Scala Guice for dependent injection. I hope the guide of this article will help you better use the Scala Guice framework to improve the maintenance and testability of the code.