一、 POI简介
Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。
错误：org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)
错误：2003与2007版本冲突了
https://zhidao.baidu.com/question/1862130106281668227.html
使用jxl.jar包操作excel：http://www.cnblogs.com/sunzhenxing19860608/archive/2010/12/27/1918128.html
http://www.oschina.net/p/poi/
http://mianhuaman.iteye.com/blog/1006830