Workbook workbook = null;
                try {
                    workbook = new HSSFWorkbook(file.getInputStream());  //将获取的流转成Excel 
                }catch(Exception ex){
                    workbook = new XSSFWorkbook(file.getInputStream());  //将获取的流转成Excel 
                }
          Sheet sheet1 = workbook.getSheetAt(0);//获取Sheet