Apache POI - 如何使用日期单元格对 excel 进行密码保护？

Question

I'm using Apache POI to create password-protected excel, but it cannot work if I use the following:

cell = row.createCell(colNum);
cell.setCellValue(value);
var cellStyle = wb.createCellStyle();
cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd/mm/yyyy"));
cell.setCellStyle(cellStyle)

The date values are number of days since 01/01/1900.

If I omit Date Formatting - the encryption works fine. Has anyone managed to have created a password-protected excel with date cells?

Answer 1

With credit to Axel Richter , the answer was solved at this question styles.xml breaking password-protected XSSFWorkbook (Apache POI v3.16) save process .

Note: This code is for server-side Javascript - using Mozilla Rhino v1.7R3 which provides support for nearly all of ECMAScript Edition 5 plus a few features from Mozilla Javascript 1.8.

To create password-protected excel with date cells, the format of date cell are created once, not at each cell creation.

importPackage(org.apache.poi.xssf.usermodel);
importPackage(org.apache.poi.ss.usermodel);
importPackage(org.apache.poi.ss.util);
importPackage(org.apache.poi.poifs.filesystem);
importPackage(org.apache.poi.poifs.crypt);
importPackage(org.apache.poi.openxml4j.opc);

//Create the workbook
var wb = new XSSFWorkbook();

//Add styling at the top
var createHelper = wb.getCreationHelper();
var dateStyle = wb.createCellStyle();
dateStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd/mm/yyyy"));

//Process the cells
//loop..
createDateCell(row, colNum++, tables.SHE_SOUTH.DOB.value, dateStyle);
//..end of loop

function createDateCell(row,colNum,value, cellStyle){
    var cell;
    if(value){
        cell = row.createCell(colNum, Cell.CELL_TYPE_NUMERIC);
        cell.setCellValue(value);
        cell.setCellStyle(cellStyle);
    }
    else
    {
        cell = row.createCell(colNum, Cell.CELL_TYPE_BLANK);
    }
    return cell;
}

//Write out the excel
var fileOut = new java.io.FileOutputStream(path_and_filename);
wb.write(fileOut);
fileOut.close();

//Begin encryption
var fs = new POIFSFileSystem();
var info = new EncryptionInfo(EncryptionMode.agile, CipherAlgorithm.aes192,
 HashAlgorithm.sha384, -1, -1, null);
var enc = info.getEncryptor();
enc.confirmPassword("password");

var opc = OPCPackage.open(new java.io.File(path_and_filename), PackageAccess.READ_WRITE);
var os = enc.getDataStream(fs);
opc.save(os);
opc.close();

var fos = new java.io.FileOutputStream(path_and_filename);
fs.writeFilesystem(fos);
fos.close();