@Override
    public DataFormat createDataFormat() {
        if (csvDataFormat != null) {
            return csvDataFormat;
        }
        csvDataFormat = new CsvDataFormat(locale);
        return csvDataFormat;
    }
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