apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/util/ConfigToFileUtils.java/ConfigToFileUtils/itemsToFile
class ConfigToFileUtils:  @Deprecated
  public static void itemsToFile(OutputStream os, List<String> items) {
    try {
      PrintWriter printWriter = new PrintWriter(os);
      items.forEach(printWriter::println);
      printWriter.close();
    } catch (Exception e) {
      throw e;
    }
  }