DiskFileItemFactory factory = new DiskFileItemFactory();
// 缓存大小
factory.setSizeThreshold(4096);
factory.setRepository(new File(tempPath));
ServletFileUpload fu=new ServletFileUpload(factory);
@SuppressWarnings("unchecked")
List<FileItem> fileItems = fu.parseRequest(req);
其中 fileItems 为空,后发现web.xml 的struts配置的filter过滤了;
应为*.do,不应为*;