无法从字符串单元格获得数值;
switch (cell.getCellTypeEnum()) {
case NUMERIC:
int numericCellValue =(int) cell.getNumericCellValue();
value += numericCellValue + ",";
break;
case STRING:
String stringCellValue = cell.getStringCellValue();
value += stringCellValue + ",";
break;
case BLANK:
value += "0";
break;
default:
break;