Java File转换为MultipartFile

    public static MultipartFile toMultipartFile(File file){
        MultipartFile multipartFile = null;
        FileInputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(file);
            multipartFile = new MockMultipartFile(file.getName(), file.getName(),
                    ContentType.APPLICATION_OCTET_STREAM.toString(), fileInputStream);
        }catch (IOException e){
            log.error("file转换MultipartFile出错");
        }finally {
            try {
                if(fileInputStream != null){
                    fileInputStream.close();
                }
            } catch (IOException e){
                log.error("流关闭出错");
            }
        }
        return multipartFile;
    }