@Override
    public Double convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
                                    GlobalConfiguration globalConfiguration) throws ParseException {
        return NumberUtils.parseDouble(cellData.getStringValue(), contentProperty);
    }
Double and string converter

@author Jiaju Zhuang
fastexcel-core/src/main/java/cn/idev/excel/converters/doubleconverter/DoubleStringConverter.java