下载协议文件接口解析-优快云博客

本文详细解析了一个用于下载协议文件的RESTful API接口实现。该接口通过GET请求方式，接收文件ID参数，从OSS存储中下载对应文件，并将其返回给客户端。文章深入探讨了接口的参数验证、文件路径构建、异常处理等关键环节。

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    /**
     * 下载协议文件
     *
     * @param fileId
     * @param response
     * @return
     */
    @RequestMapping(value = "offer/download/{fileId}", method = RequestMethod.GET)
    public R download(@PathVariable("fileId") String fileId, HttpServletResponse response) {
        if (StringUtil.isBlank(fileId)) {
            LoggerUtil.error(LOGGER, null, "[OfferController-aggrement-fileId-null]:", ErrorCodeEnum.REQUEST_PARAM_ERROR.getCode(),
                    ErrorCodeEnum.REQUEST_PARAM_ERROR.getMsg());
            return R.error(WebCodeEnum.FIELD_ID_ENPTY.getCode(), WebCodeEnum.FIELD_ID_ENPTY.getMsg());
        } else {
            fileId = fileId.replace(Constant.UNDERLINE, Constant.DOT);
        }
        ByteArrayOutputStream bos = null;
        try {
            bos = ossClientService.download(OssClientUtil.getOssPathByFileId(fileId, OssConstant.FORMAL));
            if (bos == null) {
                bos = ossClientService.download(OssClientUtil.getOssPathByFileId(fileId, OssConstant.TEMP));
            }
            byte[] output = bos.toByteArray();
            response.setContentLengthLong(output.length);
            response.getOutputStream().write(output);
        } catch (Exception e) {
            throw new RRException(e.getMessage());
        }
        return null;
    }

NJJR-OSS下载文件