The technical principles of the "Annotations for DS" framework in the Java class library

The "Annotations for DS" framework in the Java class library is a technology used to depend on injection. It is implemented based on the principle of annotations and reflection.The technical principles of the framework will be explained in detail. 1. Annotations: Note is a type of metadata that can be attached to classes, methods, variables, etc., to explain and mark the code.In the Annotations for DS framework, some custom annotations are used to mark and configure the relying information to inject related information. 2. Reflection (Reflection): Reflection is a powerful mechanism in Java, which allows dynamically checking and modifying information such as class, methods, attributes, etc. at runtime and calls.Annotations for DS framework uses a reflection mechanism to achieve dependency injection by scanning. 3. Framework configuration: In Annotations for DS framework, a configuration file is usually required to use this configuration file to define the classes and related settings that need to be injected.The configuration file can use XML, annotation or other formats, and the framework loads the configuration file when initialization. 4. Note processor: Annotations for DS frameworks analyze and process annotations through custom annotations, and depend on injecting operations at the right time.The annotation processor is responsible for all class files under the scanning path, find classes that marked specific annotations, and automatically create objects based on information in the annotation and inject dependencies. 5. Relying injection: Dependent injection is a technology that injects other objects relying on the class through external settings.Annotations for DS framework is scanned by scanning and using the reflection mechanism to make dependencies injects according to the dependent relationship specified in the annotation.Therefore, programmers do not need to manually write a large number of objects to create and depend on the code injected, and the framework will automatically complete these operations. In summary, the Annotations FOR DS framework realizes the relying on the injection function through annotations and reflex technology, as well as related configuration and annotation processors.It simplifies the writing and maintenance of code, and improves the readability and reuse of the code.If you need to use this framework, the programmer only needs to understand the configuration and annotation rules of the framework, and the bid dependency of the code in the code can achieve automatic dependency injection.