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");
	}
}