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

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