poi 导出excel文件 可以彻底解决无法打开Excel文件问题

Java代码为：

public static void main(String[] args) throws IOException {Date now=new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");String localname=dateFormat.format(now);String xlsxPath = "d:\\"+ localname + ".xls";HSSFWorkbook workBook = new HSSFWorkbook();OutputStream fos = null;try {//增加一个Sheet的对象HSSFSheet sheet = workBook.createSheet("sheet1");HSSFRow row = sheet.createRow(0);row.createCell(0).setCellValue("aaaaaaaa");fos = new FileOutputStream(xlsxPath);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}workBook.write(fos);fos.close();}

注意： 是.xls，不支持.xlsx