java poi 怎樣得到公式計算後的數值?怎樣得到計算公式?

 

 switch (cell.getCellType()) {
            case Cell.CELL_TYPE_NUMERIC: //數字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                //cellValue = String.valueOf(cell.getCellFormula());  //直接獲得公式
                cellValue = String.valueOf(cell.getNumericCellValue());  //獲得公式計算後的值
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "0";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知類型";
                break;
        }