從HttpServletRequest獲取當前請求中的文件列表，解決前端無法傳文件數組問題

public static List<MultipartFile> getMultipartFileList(
            HttpServletRequest request) {
        List<MultipartFile> files = new ArrayList<MultipartFile>();
        try {
            CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                    request.getSession().getServletContext());
            if (request instanceof MultipartHttpServletRequest) {
                // 將request變成多部分request
                MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
                Iterator<String> iter = multiRequest.getFileNames();
                // 檢查form中是否有enctype="multipart/form-data"
                if (multipartResolver.isMultipart(request) && iter.hasNext()) {
                    // 獲取multiRequest 中所有的文件名
                    while (iter.hasNext()) {
                        // 一次遍歷所有文件
                        // MultipartFile file =
                        // multiRequest.getFile(iter.next().toString());
                        // if (file != null) {
                        // files.add(file);
                        // }
                        // 適配名字重複的文件
                        List<MultipartFile> fileRows = multiRequest
                                .getFiles(iter.next().toString());
                        if (fileRows != null && fileRows.size() != 0) {
                            for (MultipartFile file : fileRows) {
                                if (file != null && !file.isEmpty()) {
                                    files.add(file);
                                }
                            }
                        }
                    }
                }
            }
        } catch (Exception ex) {
            System.err.print("解析MultipartRequest錯誤");
            LOG.error("解析MultipartRequest錯誤",ex);
        }
        return files;
    }