demo

@Repositorypublic class UserDao {}@Servicepublic class UserService {    @Autowired    private UserDao userDao;}

源码

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE, ElementType.ANNOTATION_TYPE})@Retention(RetentionPolicy.RUNTIME)@Inherited@Documentedpublic @interface Qualifier {    String value() default "";}