SpringBoot根据注解动态执行类中的方法实现

/**
 * 自定义注解
 */
@Retention(RetentionPolicy.RUNTIME) // 作用于运行时
@Target(ElementType.TYPE)   // 作用于类上
@Component
public @interface Extension {
    String bizScene() default "defaultBizScene";
    String useCase() default "defaultUseCase";
}

public interface Father {
    public String sayHello();
}

@Component
@Extension(bizScene="test", useCase="one")
public class FatherOne implements Father {
    @Override
    public String sayHello() {
        System.out.println("测试: father1");
        return "father1";
    }
}

@Component
@Extension(bizScene="test", useCase="two")
public class FatherTwo implements Father{
    @Override
    public String sayHello() {
        System.out.println("测试: father2");
        return "father2";
    }
}

@Component
public class ExtInitiator {
    @Autowired
    ExtRespository extRespository;
    @Autowired
    private ApplicationContext applicationContext;
    @PostConstruct
    public void init(){
        Map<String, Object> extensionBeans = applicationContext.getBeansWithAnnotation(Extension.class);
        for(Object bean : extensionBeans.values()){
            Class<?> extensionClz = ClassUtils.getUserClass(bean);
            Extension extension = AnnotationUtils.findAnnotation(extensionClz, Extension.class);
            String bizScene = extension.bizScene();
            String useCase = extension.useCase();
            extRespository.getExtRepository().put(bizScene + "_" + useCase, bean);
        }
    }
}

@Component
public class ExtRespository {
    private Map<String, Object> extRepository = new HashMap<>();
    public Map<String, Object> getExtRepository(){
        return extRepository;
    }
}

@Autowired
ExtRespository extRespository;
@Test
public void testExtension() {
    Function<Father, String> exeFunction = extention -> extention.sayHello();
    System.out.println("test_two场景下调用sayHello：" + exeFunction.apply((Father)extRespository.getExtRepository().get("test_two")));
}