使用s2Sh编写的文件上传，与普通的struts上传有所不同，此程序能够获得当前传输的进度与剩下的文件大小，及所需要的时间和剩余时间-Use s2Sh prepare the file upload, upload struts with ordinary differ, this program can obtain the current progress of the transfer and the rest of the file size, and the time required