java poi 往xlsx写数据为空

今天遇到一个有趣的问题，不报任何异常，程序跑完了，居然没往excel里写数据

后来将SXSSFWorkbook改为XSSFWorkbook才成功！！！

  /*** 向已存在的excel中追加数据** @param absolutePath 已存在的excel绝对路径* @param sheetName   sheet的序号，从0开始* @param dataList     cell数据* @return* @throws IOException*/public static Boolean addExcel(String absolutePath, String sheetName, List<String[]> dataList) throws IOException {XSSFWorkbook   wb = null;FileOutputStream out = null;FileInputStream fileInputStream = null;try{int columnsNum = dataList.get(0).length;fileInputStream = new FileInputStream(absolutePath);wb = new XSSFWorkbook();wb = (XSSFWorkbook) WorkbookFactory.create(fileInputStream);Sheet  sheet =wb.getSheet(sheetName);out = new FileOutputStream(absolutePath);Row row;int lastRowNum = sheet.getLastRowNum();for (int i = 0; i < dataList.size(); i++) {//row = sheet.createRow(++lastRowNum);row = sheet.getRow(++lastRowNum);if (row == null) {row = sheet.createRow(lastRowNum);}String[] addOneRowData = dataList.get(i);for (int j = 0; j < addOneRowData.length; j++) {String str = addOneRowData[j];row.createCell(j).setCellValue(str);}}out.flush();wb.write(out);}catch (Exception e) {e.printStackTrace();} finally {if (fileInputStream != null) {fileInputStream.close();}if (wb != null) {//wb.dispose();// 删除临时文件，很重要，否则磁盘可能会被写满}try {if(out != null) {out.close();}} catch (IOException e) {e.printStackTrace();}try {if(wb != null) {wb.close();}} catch (IOException e) {e.printStackTrace();}}return true;}

那他们的区别

HSSFworkbook,XSSFworkbook,SXSSFworkbook区别总结_千百元的博客-CSDN博客用JavaPOI导出Excel时，我们需要考虑到Excel版本及数据量的问题。针对不同的Excel版本，要采用不同的工具类，如果使用错了，会出现错误信息。JavaPOI导出Excel有三种形式，他们分别是1.HSSFWorkbook 2.XSSFWorkbook3.SXSSFWorkbook。HSSFWorkbook:是操作Excel2003以前（包括2003）的版本，扩展名是.xls；XSSFWorkbook:是操作Excel2007后的版本，扩展名是.xlsx；SXSSFWorkboo...https://blog.csdn.net/liuming690452074/article/details/125056360?csdn_share_tail=%7B%22type%22%3A%22blog%22%2C%22rType%22%3A%22article%22%2C%22rId%22%3A%22125056360%22%2C%22source%22%3A%22liuming690452074%22%7D&ctrtid=x8TUz