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    @Override
    public String store(MultipartFile file, String fileName) throws IOException {

        String destPath "/app/file/";
        File filePath = new File(destPath);
        File dest = new File(filePath, fileName);
        if (!filePath.exists()) {
            filePath.mkdirs();
        }
        try {
            file.transferTo(dest);
            log.info("file save success");
        } catch (IOException e) {
            log.error("File upload Error: ", e);
            throw e;
        }
        return dest.getCanonicalPath();
    }