如何使用 selenium 在 excel 中写入 int 或 double 值

Question

File f = new File("C:\Users\");

    FileInputStream fi = new FileInputStream(f);

    Workbook w = new XSSFWorkbook(fi);

    Sheet sheet = w.getSheet("Sheet1");

    Row row = sheet.getRow(1);

    Cell cell = row.getCell(1);
    
    
        cell.setCellValue("300");
        
    FileOutputStream fout = new FileOutputStream(f);
    
    w.write(fout);

实际上我在运行代码时遇到了空指针异常