@Override
    public WriteCellData<?> convertToExcelData(Integer value, ExcelContentProperty contentProperty,
                                               GlobalConfiguration globalConfiguration) {
        return NumberUtils.formatToCellDataString(value, contentProperty);
    }
Integer and string converter

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