public static Double parseDouble(String string, ExcelContentProperty contentProperty) throws ParseException {
        if (!hasFormat(contentProperty)) {
            return new BigDecimal(string).doubleValue();
        }
        return parse(string, contentProperty).doubleValue();
    }
parse

@param string
@param contentProperty
@return
fastexcel-core/src/main/java/cn/idev/excel/util/NumberUtils.java