docs: public String downloadFileFromServer(String url, String fileName, String targetFileDir) throws Exception {
  
          // 下载的路径
          String localDir = getLocalDownloadDirPath();
  
          // 设置远程地址
          RemoteUrl remoteUrl = new RemoteUrl(url, hostList);
  
          // 下载
          return restfulMgr
                  .downloadFromServer(remoteUrl, fileName, localDir, localDownloadDirTemp, targetFileDir,
                          enableLocalDownloadDirInClassPath,
                          retryTime,
                          retrySleepSeconds);
  
      }