JAVA POI读取EXECL文件片段

/**
 * Excel导入信息提取
 * 注意文件尽量xls，xlsx后缀在不同环境可能导致读取时空指针
 * @param param
 * @return map 后台添加成功或失败的信息
 * @throws Exception Map
 * @author gongsy 2023-05-29
 */
public List>>> getExelInfoSheet(int sheetNum, Map param) throws Exception {
    //文件存储的本地地址
    String path = ExcelImportConstans.EXCEL_UPLOAD_PATH + "\\" + param.get("id") + ".xls";
    File file=new File(path);
    //读取结果
    List>>> listArrayList = new ArrayList<>();
    try {
        // 创建工作簿
        FileInputStream is = new FileInputStream(file);
        Workbook workbook = WorkbookFactory.create(is);
        logger.info("文件地址："+workbook.getSheetName(0));
        // 遍历sheet表单
        for (int i = 0; i < sheetNum; i++) {
            List>> lists = new ArrayList<>();
            //读取sheet表单信息
            Sheet sheet1 = workbook.getSheetAt(i);
            //遍历表单中的数据，按行读取
            for (Row row : sheet1) {
                //记录表单数据所在行，列信息以及具体值
                List> mapList = new ArrayList<>();
                for (Cell cell : row) {
                    Map infoMap = new HashMap<>();
                    //列信息
                    infoMap.put("loacl", cell.getColumnIndex() + "");
                    //具体内容
                    infoMap.put("value", cell.toString());
                    //行信息
                    infoMap.put("row", cell.getRowIndex() + "");
                    mapList.add(infoMap);
                }
                lists.add(mapList);
            }
            //记录当前工作薄信息
            listArrayList.add(lists);
            // 关闭工作簿和文件流
            workbook.cloneSheet(i);
        }
        //关闭io流
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    //返回整理后的表信息
    return listArrayList;
}