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