How to use Apache Felix iPojo Annotations framework in the Java library to achieve dependency injection

Use Apache Felix Ipojo annotation framework to achieve dependent injection steps in the Java class library as follows: 1. Environmental settings: -Apache felix ipjo dependencies are added to the project construction file: <dependency> <groupId>org.apache.felix</groupId> <artifactId>org.apache.felix.ipojo.annotations</artifactId> <version>1.12.1</version> </dependency> -Kenging that the project already contains an OSGI container supported by iPojo (such as Apache Felix or Eclipse Equinox). 2. Create a Java class and add dependency injection annotations: import org.apache.felix.ipojo.annotations.*; @Component public class MyComponent { @Requires private MyDependency myDependency; // Constructor public MyComponent() { // Use myDependency in the constructor myDependency.doSomething(); } // Other methods // ... } -`@Component` Annotation is used to mark this class as an iPOJO component. -``@Requires` is used to mark the dependencies that need to be injected.In the above example, `MyDependency` is a dependence that needs to be injected. 3. Enable iPOJO annotation processor: -Senged the following plug -in configuration in the project's `pom.xml` file (examples using Apache Maven to build projects): <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-ipojo-plugin</artifactId> <version>1.12.1</version> <executions> <execution> <goals> <goal>ipojo-metadata</goal> <goal>ipojo-bundle</goal> </goals> </execution> </executions> </plugin> </plugins> </build> -Ad the Maven command to generate iPoJo metadata and packages:: shell mvn clean install -In this operation, you will generate iPOJO metadata in the project's `target/geenerated-Sources/iPojo` directory. 4. Create an OSGI configuration file (`.cfg`): -Colon a file called `ipjo.cfg` in the resource folder of the project, and add the following in it: org.apache.felix.ipojo.runtime.allow.missing.optional=true This configuration is used to allow the lack of optional dependencies. 5. Construction and deployment: -Che use the project construction tool (such as MAVEN) to build a project and generate jar files. 6. Deploy projects in OSGI containers: -Stime the generated jar file to OSGI container supporting iPoJo. At this point, you have successfully used the Apache Felix Ipojo Annotations framework to achieve the dependency injection in the Java library. Please note that the above steps only provide a basic example, which does not include a complete program code and related configuration.In practical applications, you may also need to configure other IPOJO annotations and attributes to define the behavior and characteristics of components.The detailed code and configuration will change according to your actual needs.