HttpServletResponse response) throws IOException {
response.setContentType("text/html;charset=utf-8");
try {
//创建UploadListener对象
UploadListener listener = new UploadListener(request.getContentLength());
listener.start();//启动监听状态
//将监听器对象的状态保存在Session中
session.setAttribute("FILE_UPLOAD_STATS", listener.getFileUploadStats());
//创建MonitoredDiskFileItemFactory对象
FileItemFactory factory = new MonitoredDiskFileItemFactory(listener);
//通过该工厂对象创建ServletFileUpload对象