从request中获取文件

/**
* 获取文件列表从request中
*
* @param request
* @return
*/
private List getMutipartFileForRequet(HttpServletRequest request) {
List files = new ArrayList<>();

    CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());


    commonsMultipartResolver.setDefaultEncoding("utf-8");

    if (commonsMultipartResolver.isMultipart(request)) {
        MultipartHttpServletRequest mulReq = (MultipartHttpServletRequest) request;
        Map map = mulReq.getFileMap();

        // key为前端的name属性，value为上传的对象（MultipartFile）
        for (Map.Entry entry : map.entrySet()) {
            files.add(entry.getValue());
        }
    }
    return files;
}