html5 java多图片上传

<form enctype="multipart/form-data" action="url"  method="post">
　　<input type="file" name="pic" />
　　<input type="file" name="pic" />
　　<input type="file" name="pic" />
　　<input type="submit" value="提交"/>
</form>


private List<String> uploadImgs(HttpServletRequest req,String name) throws Exception{
        List<String> list = new ArrayList<String>();
            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) req;
            // 获得文件：
            List<MultipartFile> files = multipartRequest.getFiles(name);
            for(MultipartFile file:files){
                String fileExtName = file.getOriginalFilename().substring(file.getOriginalFilename().indexOf(".") + 1);
                String realPath = req.getSession().getServletContext().getRealPath("");
                String uuid = UUID.randomUUID().toString();
                //String fileName = DateTimeUtil.getDateTime2Str3S4() + "." + fileExtName;
                String fileName = uuid + "." + fileExtName;
                String imgPath = "upload"+File.separatorChar+"appShootme" + File.separatorChar + fileName;
                String imgPathRealPath = realPath + File.separatorChar+ "upload"+File.separatorChar+"appShootme" + File.separatorChar + fileName;
                File fi = new File(imgPathRealPath);

                if (!fi.exists()) {
                    fi.mkdirs();
                }
                file.transferTo(fi);
                
                list.add(imgPath);
            }
        return list;
    }