需要明白的：

操作excel方式有兩種： JXL  2. POI

匯入時，JXL不能讀取高版本的Excel(07以上)，POI更具相容性。

poi解析Excel檔案時有兩種格式： 
HSSFWorkbook格式用來解析Excel2003（xls）的檔案 
XSSFWorkbook格式用來解析Excel2007（xlsx）的檔案 
如果用HSSFWorkbook解析Excel2007（xlsx）時就會報異常：“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)”