Spring boot Multipartfile.getbytes 报错找不到文件？

该接口首先通过Multipartfile得到前端上传的文件，然后将该文件写入磁盘中，我看了相关问题，但是我使用的确实是绝对路径，另外我是用Multipartfile.transferto()时，也报错Cannot write uploaded file to disk!
下面是出错接口代码

@PostMapping("/uploadFile/{recid}/{theme}/{extramsg}/{openid}")
    public Result uploadFile(HttpServletRequest request, HttpServletResponse response,@PathVariable int recid,
            @PathVariable String theme,@PathVariable String extramsg,@PathVariable String openid) throws Exception {
//      System.out.println(recid);
//      System.out.println(theme);
//      System.out.println(extramsg);
//      System.out.println(openid); 

        //判断用户输入是否合法
        String userInputmsg = recid+theme+extramsg;
        String checkres = msgSecCheck(userInputmsg);
        if(checkres.equals("risky")) {//如果不合法，立即返回错误
            return new Result(403,"出现错误：用户输入信息不合法" ,0,null);
        }


        RecFile recfile  = new RecFile();

        String name = null;

        //获取文件需要上传到的路径

        File directory = new File("D:\\微信上传文件test");
        String path = directory.getCanonicalPath() + "\\upload\\";

        // 判断存放上传文件的目录是否存在（不存在则创建）
        File dir = new File(path);
        if (!dir.exists()) {
            dir.mkdir();
        }
        request.setCharacterEncoding("utf-8"); //设置编码
        JSONArray jsonArray = new JSONArray();
        try {

            StandardMultipartHttpServletRequest req = (StandardMultipartHttpServletRequest) request;

            Iterator<String> iterator = req.getFileNames();

            while (iterator.hasNext()) {
                HashMap<String, Object> res = new HashMap<String, Object>();

                MultipartFile file = req.getFile(iterator.next());

                // 获取文件名


                String fileNames = file.getOriginalFilename();
                System.out.println(fileNames);

                // 如果是图片，进行图片合法性检测
                String lastThree = fileNames.substring(fileNames.length()-3);
                if(lastThree.equals("PNG")||lastThree.equals("png")||lastThree.equals("JEPG")||
                        lastThree.equals("jepg")||lastThree.equals("JPG")||lastThree.equals("jpg")||
                        lastThree.equals("gif")||lastThree.equals("GIF")){

                    //如果图片不合法
                    if(imgSecCheck(file).equals("risky")) {
                        return new Result(403,"出现错误：用户上传图片不合法 ",0,null);
                    }
                }


                    if(fileNames.substring(0,4).equals("tmp_")) {//此处踩了一个大坑，pc端和手机端发送至后台的文件名格式是不一样的，需要分别进行判断和处理
                    //如果为手机端上传的文件
                    name = fileNames;
                    String destPath = path + name;

                    //真正写到磁盘上

                    File file1 = new File(destPath);

                    OutputStream out = new FileOutputStream(file1);

                    out.write(file.getBytes());

                    res.put("url", destPath);

//                                  result.setValue(jsonArray);

                    jsonArray.add(res);

                    out.close();


                }
                else {//文件由pc端提交
                    System.out.println("进来没");
                    String temp[] = fileNames.split("\\.");
                    for(String s : temp) {
                        System.out.println(s);
                    }

                    //获取文件的唯一文件名
                    String uniqueName = temp[2];

                    //获取上传文件的后缀名
                    String extName = temp[3];

                    //组成新的文件名称

                    String newName = uniqueName + "." + extName;

                    name = newName;

                    System.out.println(newName);

                    String destPath = path + name;

                    //真正写到磁盘上


                    File file1 = new File(destPath);

                    OutputStream out = new FileOutputStream(file1.getAbsolutePath());

                    System.out.println(file1.getAbsolutePath());
                    System.out.println(destPath);

                    out.write(file.getBytes());
                    res.put("url", destPath);


//                                  result.setValue(jsonArray);

                    jsonArray.add(res);



                    out.close();

                    }

            }
        } 

报错截图：

https://blog.csdn.net/happy_cheng/article/details/54178392