case HSSFCell.CELL_TYPE_FORMULA: // 公式
FormulaEvaluator evaluator = cell.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
evaluator.evaluateFormulaCell(cell);
CellValue cellValue = evaluator.evaluate(cell);
Double celldata = cellValue.getNumberValue();
strCell=String.valueOf(celldata);
break;
