@ComponentScan

1. @Component 어노테이션이 적용된 클래스를 검색하여 빈으로 등록합니다.
2. XML이나 Annotation 두 가지 방법 중 하나를 선택할 수 있습니다.
   XML : <context:component-scan>
   Annotation : @ComponentScan
3. base 패키지를 지정할 수 있습니다. 


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org.springframework.context.annotation

Annotation Type ComponentScan

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  @Retention(value=RUNTIME)
   @Target(value=TYPE)
   @Documented
   @Repeatable(value=ComponentScans.class)
  public @interface ComponentScan

  Configures component scanning directives for use with @Configuration classes. Provides support parallel with Spring XML's <context:component-scan> element.Either basePackageClasses() or basePackages() (or its alias value()) may be specified to define specific packages to scan. If specific packages are not defined, scanning will occur from the package of the class that declares this annotation.
  Note that the <context:component-scan> element has an annotation-config attribute; however, this annotation does not. This is because in almost all cases when using @ComponentScan, default annotation config processing (e.g. processing @Autowired and friends) is assumed. Furthermore, when using AnnotationConfigApplicationContext, annotation config processors are always registered, meaning that any attempt to disable them at the @ComponentScan level would be ignored.
  See @Configuration's Javadoc for usage examples.

  Since:

  3.1

  Author:

  Chris Beams, Juergen Hoeller, Sam Brannen

  link:

  http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/context/annotation/ComponentScan.html