@Override
    public CellStyle createCellStyle() {
        if (csvCellStyleList == null) {
            csvCellStyleList = Lists.newArrayList();
        }
        CsvCellStyle csvCellStyle = new CsvCellStyle((short)csvCellStyleList.size());
        csvCellStyleList.add(csvCellStyle);
        return csvCellStyle;
    }
Set the encoding prefix in the csv file, otherwise the office may open garbled characters.
Default true.
fastexcel-core/src/main/java/cn/idev/excel/metadata/csv/CsvWorkbook.java