java上传文件到后端，解析内容到打印面板

java上传文件到后端，解析内容到打印面板

    @ApiOperation("文件上传统一入口")
    @PostMapping("/fileUpload")
    public Result fileUpload(@ApiParam("md文件上传") @RequestPart("multipartFile") MultipartFile multipartFile, HttpServletRequest request) {
        String name = multipartFile.getOriginalFilename();
        
        InputStream inputStream = null;
        try {
            inputStream = multipartFile.getInputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //创建一个缓冲区
        byte[] buffer = new byte[1024 * 1024];
        //判断读取是否完毕
        int len = 0;
        while (true) {
            try {
                if (!((len = inputStream.read(buffer)) < 0)) break;
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        String s = new String(buffer,0,len);
        log.info("俺是打印::::"+s);
        try {
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        
        return Result.ok();
    }