poi锁定单元格

public static void WriteExcelByPoi(String fileData) throws IOException, InvalidFormatException {
    try {
        InputStream in = new FileInputStream(fileData);

        Workbook workbook = new XSSFWorkbook(in);
        org.apache.poi.ss.usermodel.Sheet sheet = (org.apache.poi.ss.usermodel.Sheet)workbook.getSheetAt(1);
        sheet.protectSheet("yanggb"); // 设置表单保护密码

        org.apache.poi.ss.usermodel.Row row = null;
        org.apache.poi.ss.usermodel.Cell cell = null;

        String cellValue = "1234567890";
        XSSFCellStyle alterableStyle = (XSSFCellStyle)workbook.createCellStyle(); // 获取当前单元格的样式对象
        alterableStyle.setLocked(true); // 设定此单元格为锁定状态
        XSSFCellStyle nolockedStyle = (XSSFCellStyle)workbook.createCellStyle(); // 获取当前单元格的样式对象
        nolockedStyle.setLocked(false); // 设定此单元格为非锁定状态
         
        String value = "非锁定";

        for (int i = 0; i < 5; i++) {
            System.out.println(" i =" + i);
            row = sheet.createRow(i);
            cell = row.createCell(0);
            cell.setCellValue(cellValue);
            cell.setCellStyle(alterableStyle);
            cell = row.createCell(1);
            cell.setCellValue(value);
            cell.setCellStyle(nolockedStyle);
        }
        
        in.close();
        
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(fileData);
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}