问如何从.pdf工件中清除文本？

EN

 PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
    PdfPage page = pdfDoc.getFirstPage();
    PdfDictionary dict = page.getPdfObject();

    PdfObject object = dict.get(PdfName.Contents);
    if (object instanceof PdfStream) {
        PdfStream stream = (PdfStream) object;
        byte[] data = stream.getBytes();
        String replacedData = new String(data).replace("{#Address_line1}", "Saint-Petersburg");
        stream.setData(replacedData.getBytes(StandardCharsets.UTF_8));
    }

    pdfDoc.close()