@Override
    public WriteCellData<?> convertToExcelData(WriteConverterContext<Long> context) {
        return NumberUtils.formatToCellData(context.getValue(), context.getContentProperty());
    }
Long and number converter

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