docs: private static String getGroupName(String filePath) {
          //先分隔开路径
          String[] paths = filePath.split(SPLIT_GROUP_NAME_AND_FILENAME_SEPERATOR);
          if (paths.length == 1) {
              throw new FdfsUnsupportStorePathException("解析文件路径错误,有效的路径样式为(group/path) 而当前解析路径为".concat(filePath));
          }
          System.out.println(paths);
          for (String item : paths) {
              if (item.indexOf(SPLIT_GROUP_NAME) != -1) {
                  return item;
              }
          }
          throw new FdfsUnsupportStorePathException("解析文件路径错误,被解析路径url没有group,当前解析路径为".concat(filePath));
      }