获取颜色报错Cell.CELL_TYPE_STRING

[JilingLee462362]

if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
return cell.getStringCellValue();

	} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
		return String.valueOf(cell.getBooleanCellValue());

	} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
		return cell.getCellFormula();

我是不是少了什么包？