解决导出问题，路径问题

     String pathdir = "/UploadFiles/Images/"+ DateTime.getDirectory();//构建图片保存的目录
     String realpathdir = ServletActionContext.getServletContext().getRealPath(pathdir);
     String ext = uploadFile.getImgUrlFileName().trim().substring(uploadFile.getImgUrlFileName().trim().lastIndexOf('.')+1).toLowerCase();
     String saveimagename = UUID.randomUUID().toString() + "." + ext;//构建文件名称
     
     SaveFile.image(uploadFile, realpathdir, saveimagename, 300);
     ///UploadFiles/Images/2012/03/31/d64f714e-aedb-463e-b913-5bf4f8f8a0b7.jpg

     
     String pathfile = pathdir+"/"+saveimagename;