java poi 获取单元格值时间

完整帮助类：JAVA poi 帮助类

    /*
     * poi特殊日期格式：数字格式化成-yyyy年MM月dd日，格式
     * */
    private static ArrayList<String> PoiDateList = new ArrayList<String>() {
        {
            add("年");
            add("月");
            add("日");
        }
    };

    /// <summary>
    /// 获取XSSFRow的值（全部统一转成字符串）
    /// </summary>
    /// <param name="row"></param>
    /// <param name="index"></param>
    /// <returns></returns>
    public static String GetValue(Row row, int index) {
        Cell rowCell = row.getCell(index);
        return rowCell == null ? "" : GetValueByCellStyle(rowCell, rowCell.getCellType());
    }

    /// <summary>
    /// 根据单元格的类型获取单元格的值
    /// </summary>
    /// <param name="rowCell"></param>
    /// <param name="type"></param>
    /// <returns></returns>
    public static String GetValueByCellStyle(Cell rowCell, int rowCellType) {
        String value = "";
        switch (rowCellType) {
            case Cell.CELL_TYPE_STRING:
                value = rowCell.getStringCellValue();
                break;
            case Cell.CELL_TYPE_NUMERIC:
                //  获取单元格值的格式化信息
                String dataFormat = rowCell.getCellStyle().getDataFormatString();
                //  判断格式化信息中是否存在：年月日
                AtomicReference<Boolean> isDate = new AtomicReference<>(false);
                if (!StringHelper.IsNullOrWhiteSpace(dataFormat))
                    PoiDateList.forEach(x -> isDate.set(isDate.get() || dataFormat.contains(x)));

                if (DateUtil.isCellDateFormatted(rowCell)) {
                    value = new SimpleDateFormat("yyyy-MM-dd").format(DateUtil.getJavaDate(rowCell.getNumericCellValue()));
                } else if (DateUtil.isCellInternalDateFormatted(rowCell)) {
                    value = new SimpleDateFormat("yyyy-MM-dd").format(DateUtil.getJavaDate(rowCell.getNumericCellValue()));
                }
                //有些情况，时间搓？数字格式化显示为时间,不属于上面两种时间格式
                else if (isDate.get()) {
                    value = new SimpleDateFormat("yyyy-MM-dd").format(rowCell.getDateCellValue());
                }
                //有些情况，时间搓？数字格式化显示为时间,不属于上面两种时间格式
                else if (dataFormat == null) {
                    value = new SimpleDateFormat("yyyy-MM-dd").format(DateUtil.getJavaDate(rowCell.getNumericCellValue()));
                } else {
                    if (StringHelper.IsNullOrWhiteSpace(dataFormat)) {
                        value = String.valueOf(rowCell.getNumericCellValue());
                    } else {
                        if (rowCell.getCellStyle().getDataFormatString().contains("$")) {
                            value = "$" + rowCell.getNumericCellValue();
                        } else if (rowCell.getCellStyle().getDataFormatString().contains("￥")) {
                            value = "￥" + rowCell.getNumericCellValue();
                        } else if (rowCell.getCellStyle().getDataFormatString().contains("¥")) {
                            value = "¥" + rowCell.getNumericCellValue();
                        } else if (rowCell.getCellStyle().getDataFormatString().contains("€")) {
                            value = "€" + String.valueOf(rowCell.getNumericCellValue());
                        } else {
                            value = String.valueOf(rowCell.getNumericCellValue());
                        }
                    }
                }
                break;
            case Cell.CELL_TYPE_BOOLEAN:
                value = String.valueOf(rowCell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_ERROR:
                value = ErrorEval.getText(rowCell.getErrorCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA:
                //  TODO: 是否存在 嵌套 公式类型
                value = GetValueByCellStyle(rowCell, rowCell.getCachedFormulaResultType());
                break;
            default:
                System.out.println(rowCell);
                break;
        }
        return value;
    }