java poi修改Excel文件的内容 并保存

    public void test5() throws Exception {
        String MyPath = "E:\\20200915.xlsx";
        FileInputStream fis = new FileInputStream(MyPath);
 
        //1.创建一个工作簿
        Workbook workbook = new XSSFWorkbook(fis);
        Sheet sheet1 = workbook.getSheet("Sheet1");
        //通过行下标和列下标返回cell对象
        Cell cell = sheet1.getRow(13).getCell(3);
        cell.setCellValue("呵呵呵呵呵呵呵");
 
        /*Row row1 = sheet1.createRow(9);
        //4.创建一个单元格
        Cell cell1 = row1.createCell(3);
        cell1.setCellValue("trewaswgfvqerf");*/
 
        FileOutputStream fos = new FileOutputStream(MyPath);
        workbook.write(fos);
        fis.close();
 
 
    }
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原文链接：https://blog.csdn.net/qq_37812895/article/details/112345813