求助各位前輩關于使用pdfbox添加圖片的問題！急求！

    private InputStream createVisualSignatureTemplate3(PDDocument srcDoc,PDRectangle rect,BufferedImage image, int pageNum,

                                                       PDSignature signature) throws IOException {



        PDDocument doc = new PDDocument();

        PDPage page = new PDPage(srcDoc.getPage(pageNum).getMediaBox());

        doc.addPage(page);



        PDAcroForm acroForm = new PDAcroForm(doc);

        doc.getDocumentCatalog().setAcroForm(acroForm);



        PDSignatureField signatureField = new PDSignatureField(acroForm);

        PDAnnotationWidget widget = signatureField.getWidgets().get(0);

        signatureField.setValue(signature);



        List<PDField> acroFormFields = acroForm.getFields();

        acroForm.setSignaturesExist(true);

        acroForm.setAppendOnly(true);

        acroForm.getCOSObject().setDirect(true);

        acroFormFields.add(signatureField);



        widget.setRectangle(rect);

        widget.setPage(page);

        page.getAnnotations().add(widget);



        //創建第一個Form（N）

        PDStream stream = new PDStream(doc);

        PDFormXObject form = new PDFormXObject(stream);

        PDResources res = new PDResources();

        form.setResources(res);

        form.setFormType(1);

        PDRectangle bbox = new PDRectangle(rect.getWidth(), rect.getHeight());

        form.setBBox(bbox);



        //創建ProcSet

        COSArray procSet = new COSArray();

        procSet.add(COSName.getPDFName("PDF"));

        procSet.add(COSName.getPDFName("Text"));

        procSet.add(COSName.getPDFName("ImageB"));

        procSet.add(COSName.getPDFName("ImageC"));

        procSet.add(COSName.getPDFName("ImageI"));

        res.getCOSObject().setItem(COSName.PROC_SET,procSet);



        //創建FRM

        PDStream stream1 = new PDStream(doc);

        PDFormXObject frm = new PDFormXObject(stream1);

        res.put(COSName.getPDFName("FRM"),frm);



        //添加frm的屬性

        frm.setFormType(1);

        frm.setBBox(bbox);

        PDResources res1 = new PDResources();

        frm.setResources(res1);



        //創建ExGState并添加屬性

        PDExtendedGraphicsState extGState = new PDExtendedGraphicsState();

        extGState.setAlphaSourceFlag(false);

        extGState.setBlendMode(BlendMode.DARKEN);

        extGState.setNonStrokingAlphaConstant(1.0f);

        extGState.setStrokingOverprintControl(true);

        res1.put(COSName.getPDFName("NtkoExt"),extGState);



        //再次添加ProcSet

        res1.getCOSObject().setItem(COSName.PROC_SET,procSet);





        ByteArrayOutputStream bao = new ByteArrayOutputStream();

        ImageIO.write(image,"png", bao);

        bao.flush();

        byte[] imageByte = bao.toByteArray();

        bao.close();



        BufferedImage clone = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);

        Graphics2D g2d = clone.createGraphics();

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);



        g2d.drawImage(image, 0, 0, null);

        g2d.dispose();



        int width2 = clone.getWidth();

        int height2 = clone.getHeight();



        for (int i = 0; i < width2; i++) {

            for (int j = 0; j < height2; j++) {

                int rgb = clone.getRGB(i, j);

                int b = (0xff & rgb);

                int g = (0xff & (rgb >> 8));

                int r = (0xff & (rgb >> 16));

                int gray = (int) (0.3 * r + 0.59 * g + 0.11 * b);



                if ((r > 120) && (g < 250) && (b < 250)) {



                    rgb = gray + (gray << 8) + (gray << 16) + (180 << 24);



                } else {



                    rgb = gray + (gray << 8) + (gray << 16) + (1 << 24);



                }



                clone.setRGB(i, j, rgb);

            }

        }



        ByteArrayOutputStream bao2 = new ByteArrayOutputStream();

        ImageIO.write(clone,"png", bao2);

        bao2.flush();

        byte[] imageByte2 = bao2.toByteArray();

        bao2.close();







        //創建image

        PDImageXObject ximage = PDImageXObject.createFromByteArray(doc, imageByte, null);

        PDImageXObject ximage2 = PDImageXObject.createFromByteArray(doc, imageByte2, null);



        COSDictionary images = new COSDictionary();

        images.setItem("Sign0",ximage);

        images.setItem("Sign1",ximage2);





        res1.getCOSObject().setItem(COSName.XOBJECT,images);





        PDAppearanceDictionary appearance = new PDAppearanceDictionary();

        appearance.getCOSObject().setDirect(true);

        PDAppearanceStream appearanceStream = new PDAppearanceStream(form.getCOSObject());

        appearance.setNormalAppearance(appearanceStream);

        widget.setAppearance(appearance);





//      無法顯示圖片



        PDAppearanceStream pdAppearanceStream = new PDAppearanceStream(frm.getCOSObject());

        PDPageContentStream contentStream = new PDPageContentStream(doc, pdAppearanceStream);



        if (isDecryption) {



            contentStream.drawImage(ximage,0, 0,rect.getWidth(),rect.getHeight());



        } else {



            contentStream.drawImage(ximage2,0, 0,rect.getWidth(),rect.getHeight());

        }

        contentStream.close();



        ByteArrayOutputStream baos = new ByteArrayOutputStream();



        doc.save(baos);

        doc.close();

        return new ByteArrayInputStream(baos.toByteArray());

    }

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