springboot集成FastDFS 下载功能怎么实现？

Question

public static InputStream downFile(String groupName, String remoteFileName) { try { StorageClient storageClient = getTrackerClient(); byte[] fileByte = storageClient.download_file(groupName, remoteFileName); InputStream ins = new ByteArrayInputStream(fileByte); return ins; } catch (IOException e) { logger.error("IO Exception: Get File from Fast DFS failed", e); } catch (Exception e) { logger.error("Non IO Exception: Get File from Fast DFS failed", e); } return null; }这是我工具类里面下载功能，请问在控制台这边怎么实现下载？