组合注解与元注解

@Target(ElementType.TYPE)  //jdk5注解，表示作用目标类型，是类、方法还是变量等
@Retention(RetentionPolicy.RUNTIME)//jdk注解，表示该注解会保存多久，生命周期相关
@Documented//jdk注解，表示是否被javadoc命令导出文档
@Configuration //组合Configuration注解
@ComponentScan //组合ComponentScan注解
public @interface WiselyConfiguration {
    String[] value() default {};
}

  @WiselyConfiguration("com.wzy.bj.myannotation")
  public class DemoConfig {
  }

@Service
public class DemoService {
    public void doService(){
        System.out.println("doing my demoService,,,,,");
    }
}

public class AnnotationMain {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DemoConfig.class);
        DemoService demoService = context.getBean(DemoService.class);
        demoService.doService();

        context.close();
    }
}