Spring注解之@Import

/**
 * Indicates one or more {@link Configuration @Configuration} classes to import.
 * 表示import 一个或多个class
 * <p>Provides functionality equivalent to the {@code <import/>} element in Spring XML.
 * 等同于Spring XML 中的 <import/>的作用
 * Allows for importing {@code @Configuration} classes, {@link ImportSelector} and
 * {@link ImportBeanDefinitionRegistrar} implementations, as well as regular component
 * classes (as of 4.2; analogous to {@link AnnotationConfigApplicationContext#register}).
 * 运行的值类型 @Configuration注解的类,@ImportSelector 和 ImportBeanDefinitionRegistrar的实现类
 *
 * <p>{@code @Bean} definitions declared in imported {@code @Configuration} classes should be
 * accessed by using {@link org.springframework.beans.factory.annotation.Autowired @Autowired}
 * injection. Either the bean itself can be autowired, or the configuration class instance
 * declaring the bean can be autowired. The latter approach allows for explicit, IDE-friendly
 * navigation between {@code @Configuration} class methods.
 * @Bean声明定义的 @Configuration实现类 通过@Autowired注入的方式访问; 不管是通过autowired 实例化还是通过
 * 配置配置类 实例化声明bean. 后一种方法显示通过IDEA友好在各个方法之间导航
 * <p>May be declared at the class level or as a meta-annotation.
 * 可以在类级别声明，也可以作为元注释
 * <p>If XML or other non-{@code @Configuration} bean definition resources need to be
 * imported, use the {@link ImportResource @ImportResource} annotation instead.
 *
 * @author Chris Beams
 * @author Juergen Hoeller
 * @since 3.0
 * @see Configuration
 * @see ImportSelector
 * @see ImportResource
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Import {

    /**
     * {@link Configuration}, {@link ImportSelector}, {@link ImportBeanDefinitionRegistrar}
     * or regular component classes to import.
     */
    Class<?>[] value();

}