vue接入下载文件接口问题

// obj：后端返回的的字节数组或者文件流；name:文件名；suffix:文件后缀
downloadFile(obj, name, suffix) {
  const url = window.URL.createObjectURL(new Blob([obj]))
  const link = document.createElement('a')
  link.style.display = 'none'
  link.href = url
  const fileName = parseTime(new Date()) + '-' + name + '.' + suffix
  link.setAttribute('download', fileName)
  document.body.appendChild(link)
  link.click()
  document.body.removeChild(link)
}

// 特别的responseType的类型为blob
export function download(url, params) {
  return request({
    url: url + '?' + qs.stringify(params, { indices: false }),
    method: 'get',
    responseType: 'blob'
  })
}

// downFile: 下载的文件，FileUtil.readBytes(downFile)得到文件的字节数组
        HttpHeaders headers = new HttpHeaders();
        // 返回的文件名
        String fileName = System.currentTimeMillis() + type;
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", fileName);
//  headers.add("Content-Disposition", "attachment;filename=" + fileName); 等同上一行
        return new ResponseEntity<>(FileUtil.readBytes(downFile), headers, HttpStatus.CREATED);

HttpServletResponse response
    ....
    ....
response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
ServletOutputStream out = response.getOutputStream();
out.write(FileUtil.readBytes(downFile));
out.close();

 /**
     * 文件下载接口
     * @param filePath  文件上传时，返回的相对路径
     * @param response
     * @param isOnLine  传入true，表示打开，但是打开的是浏览器能识别的文件，比如图片、pdf，word等无法打开
     *                  传入false,只是下载，如果不传入这个参数默认为false
     * @throws Exception
     */
    @RequestMapping(value = "/downloadFile",method = RequestMethod.GET)
    public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {
        File f = new File(realPath+filePath);
        if (!f.exists()) {
            response.sendError(404, "File not found!");
            return;
        }
        String fileName = f.getName();
        fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
        byte[] buf = new byte[1024];
        int len = 0;
        response.reset(); // 非常重要
        if (isOnLine) { // 在线打开方式
            URL u = new URL("file:///" + realPath+filePath);
            response.setContentType(u.openConnection().getContentType());
            response.setHeader("Content-Disposition", "inline; filename=" + fileName);
            // 文件名应该编码成UTF-8
        } else { // 纯下载方式
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        }
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
    }