SpringBoot接口内部从sftp服务器获取文件流实现文件下载

SpringBoot接口内部从sftp服务器获取文件流实现文件下载

    @GetMapping("/voice/file/download")
    @ApiOperation("语音文件--按id下载录音文件")
    @RequestLog(businessType = BusinessType.SELECT)
    public void downloadFile(@RequestParam("recfilename") String recfilename, HttpServletResponse response) throws IOException {
        ChannelSftp channel = (ChannelSftp) SftpUtil.initialChannel(null, sftpCtiConfiguration.getAccountSftp(), sftpCtiConfiguration.getEntranceTicketSftp(), sftpCtiConfiguration.getServerIp(), sftpCtiConfiguration.getPortSftp(), "180000");

        if (channel == null) {
            log.error(this.getClass().getSimpleName() + "#callVoiceFileList, step0:初始化连接sftp服务器失败！");
            emailUtil.sendMail("获取语音文件失败，初始化连接sftp服务器失败！请联系相关人员进行人工处理，谢谢！", "Connect sftp server failed");
            throw new BusinessException("连接cti服务器失败，请排查配置信息！");
        }
        InputStream inputStream;
        try {
            inputStream = channel.get(recfilename);
        } catch (SftpException e) {
            log.error("获取文件失败", e);
            emailUtil.sendMail("获取语音文件失败，请联系相关人员进行人工处理，谢谢！", "Get file failed");
            throw new BusinessException("获取文件失败");
        }

        String filename = recfilename.substring(recfilename.lastIndexOf("/") + 1);
        response.setCharacterEncoding("utf-8");
        response.setContentType("application/octet-stream");
        // 对真实文件名进行百分号编码
        String percentEncodedFileName = URLEncoder.encode(filename, "utf-8")
                .replaceAll("\\+", "%20");
        // 组装contentDisposition的值
        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);
        response.setHeader("Content-disposition",
                contentDispositionValue.toString());
        response.setHeader("filename", java.net.URLEncoder.encode(filename, "UTF-8"));
        // 将文件流写到response中
        try (
             OutputStream outputStream = response.getOutputStream()) {
            IOUtils.copy(inputStream, outputStream);
        } catch (IOException e) {
            log.error("文件下载失败！", e);
            throw new BusinessException("文件下载失败！");
        }
        log.info(this.getClass().getSimpleName() + "#downloadFile(),文件下载完毕！");
    }