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)”

try{
 //将文件的输入流转换成Workbook
 Workbook wb = WorkbookFactory.create(numFile.getInputStream());
 //获得第一个工作表
 Sheet sheet = wb.getSheetAt(0);
 //获得第一行
 Row row = sheet.getRow(0);
 //获得第一行的第一列
 Cell cell = row.getCell(0);
}catch (Exception e){
 e.printStackTrace();
}