importExcelBySax NullPointerException

[ma19881117]

jeecgboot版本： 3.5.3

描述：importExcelBySax方法中ImportParams 为null，readExcel方法不支持ImportParams 为null

报错位置行：params.getSheetNum()

public static List importExcelBySax(InputStream inputstream, ISaxRowRead rowRead) { return new SaxReadExcel().readExcel(inputstream, null, null, rowRead, null); }

private <T> List<T> readExcel(OPCPackage opcPackage, Class<?> pojoClass, ImportParams params, ISaxRowRead rowRead, IExcelReadRowHanlder hanlder) {
    try {
        XSSFReader xssfReader = new XSSFReader(opcPackage);
        SharedStringsTable sst = xssfReader.getSharedStringsTable();
        if (rowRead == null) {
            rowRead = new SaxRowRead(pojoClass, params, hanlder);
        }
        XMLReader parser = fetchSheetParser(sst, rowRead);
        Iterator<InputStream> sheets = xssfReader.getSheetsData();
        int sheetIndex = 0;
        while (sheets.hasNext() && sheetIndex < params.getSheetNum()) {
            sheetIndex++;
            InputStream sheet = sheets.next();
            InputSource sheetSource = new InputSource(sheet);
            parser.parse(sheetSource);
            sheet.close();
        }
        return rowRead.getList();
    } catch (Exception e) {
        LOGGER.error(e.getMessage(), e);
        throw new ExcelImportException("SAX导入数据失败");
    }
}