apollo-client/src/main/java/com/ctrip/framework/apollo/spring/property/SpringValueDefinitionProcessor.java/SpringValueDefinitionProcessor/SpringValueDefinitionProcessor
class SpringValueDefinitionProcessor:  public SpringValueDefinitionProcessor() {
    configUtil = ApolloInjector.getInstance(ConfigUtil.class);
    placeholderHelper = SpringInjector.getInstance(PlaceholderHelper.class);
  }