apollo-client-config-data/src/main/java/com/ctrip/framework/apollo/config/data/system/ApolloClientSystemPropertyInitializer.java/ApolloClientSystemPropertyInitializer/initializeSystemProperty
class ApolloClientSystemPropertyInitializer:  public void initializeSystemProperty(Binder binder, BindHandler bindHandler) {
    for (String propertyName : ApolloApplicationContextInitializer.APOLLO_SYSTEM_PROPERTIES) {
      this.fillSystemPropertyFromBinder(propertyName, propertyName, binder, bindHandler);
    }
  }