org.springframework.stereotype

## 注释类型 Service

-     @Target(value=TYPE)
       @Retention(value=RUNTIME)
       @Documented
       @Component
      public @interface Service

  Indicates that an annotated class is a "Service", originally defined by Domain-Driven Design (Evans, 2003) as "an operation offered as an interface that stands alone in the model, with no encapsulated state."

  May also indicate that a class is a "Business Service Facade" (in the Core J2EE patterns sense), or something similar. This annotation is a general-purpose stereotype and individual teams may narrow their semantics and use as appropriate.

  This annotation serves as a specialization of `@Component`, allowing for implementation classes to be autodetected through classpath scanning.

  从以下版本开始:
    2.5
  作者:
    Juergen Hoeller
  另请参阅:
    `Component`, `Repository`

- - ### 可选元素概要

    可选元素
    限定符和类型 | 可选元素和说明
    --- | ---
    `String` | `value` The value may indicate a suggestion for a logical component name, to be turned into a Spring bean in case of an autodetected component.

- - ### 元素详细资料

    - #### value

          @AliasFor(annotation=Component.class)
          public abstract String value

      The value may indicate a suggestion for a logical component name, to be turned into a Spring bean in case of an autodetected component.
      返回:
        the suggested component name, if any (or empty String otherwise)
      默认值:
        ""