@Target(value={FIELD,METHOD,PARAMETER,ANNOTATION_TYPE}) @Retention(value=RUNTIME) @Documented public @interface Value
Typically used for expression-driven dependency injection. Also supported for dynamic resolution of handler method parameters, e.g. in Spring MVC.
A common use case is to assign default field values using
 #{systemProperties.myProp} style expressions.
 
Note that actual processing of the @Value annotation is performed
 by a BeanPostProcessor which in turn means that you cannot use
 @Value within
 BeanPostProcessor or
 BeanFactoryPostProcessor
 types. Please consult the javadoc for the AutowiredAnnotationBeanPostProcessor
 class (which, by default, checks for the presence of this annotation).
AutowiredAnnotationBeanPostProcessor, 
Autowired, 
BeanExpressionResolver, 
AutowireCandidateResolver.getSuggestedValue(org.springframework.beans.factory.config.DependencyDescriptor)public abstract String value
#{systemProperties.myProp}.