try {
List<FileItem> fileItems = RequestParser.parse(request, response);
response.setContentType("text/html");
if("imgUpload".equals(getParameter("op", fileItems))) {
fileItems = UploadHelper.getInstance().doUpload(fileItems);
new ImageSrcMaker().writeToResponse(response, fileItems);
} else if ("downLoadLayoutFile".equals(getParameter("op", fileItems))) {
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition", "attachment;filename=layout.vk");
response.getWriter().write(getParameter("downloadString", fileItems));
} else if ("upLoadLayoutFile".equals(getParameter("op", fileItems))) {