apollo-core/src/main/java/com/ctrip/framework/apollo/core/utils/PropertiesUtil.java/PropertiesUtil/filterPropertiesComment
class PropertiesUtil:  static boolean filterPropertiesComment(StringBuffer stringBuffer) {
    //check whether has comment in the first line
    if (stringBuffer.charAt(0) != '#') {
      return false;
    }
    int commentLineIndex = stringBuffer.indexOf("\n");
    if (commentLineIndex == -1) {
      return false;
    }
    stringBuffer.delete(0, commentLineIndex + 1);
    return true;
  }