apollo-client/src/main/java/com/ctrip/framework/apollo/spring/annotation/SpringValueProcessor.java/SpringValueProcessor/processField
class SpringValueProcessor:  @Override
  protected void processField(Object bean, String beanName, Field field) {
    // register @Value on field
    Value value = field.getAnnotation(Value.class);
    if (value == null) {
      return;
    }

    doRegister(bean, beanName, field, value);
  }