如何解决java使用pdfbox添加带有签名的图片
我尝试了示例:CreateVisualSignature2.java,但是没有用。为什么我的图片显示不出来,但是点击显示图片的区域可以,点击后也可以显示图片信息,但是看不到图片。
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);
PDFormXObject form = new PDFormXObject(doc);
PDResources res = new PDResources();
PDRectangle bbox = new PDRectangle(rect.getWidth(),rect.getHeight());
form.setResources(res);
form.setFormType(1);
form.setBBox(bbox);
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);
PDFormXObject frm = new PDFormXObject(doc);
PDResources res1 = new PDResources();
res.put(COSName.getPDFName("FRM"),frm);
frm.setResources(res1);
frm.setFormType(1);
frm.setBBox(bbox);
PDExtendedGraphicsState extGState = new PDExtendedGraphicsState();
extGState.setAlphaSourceFlag(false);
extGState.setBlendMode(BlendMode.DARKEN);
extGState.setNonStrokingAlphaConstant(1.0f);
extGState.setStrokingOverprintControl(true);
res1.put(COSName.getPDFName("Ext"),extGState);
res1.getCOSObject().setItem(COSName.PROC_SET,procSet);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
ImageIO.write(image,"png",bao);
bao.flush();
byte[] imageByte = bao.toByteArray();
bao.close();
PDImageXObject ximage = PDImageXObject.createFromByteArray(doc,imageByte,null);
COSDictionary images = new COSDictionary();
images.setItem("Sign0",ximage);
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);
PDAppearanceStream pdAppearanceStream = new PDAppearanceStream(frm.getCOSObject());
PDPageContentStream contentStream = new PDPageContentStream(doc,pdAppearanceStream);
contentStream.drawImage(ximage,rect.getWidth(),rect.getHeight());
contentStream.close();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
doc.save(baos);
doc.close();
return new ByteArrayInputStream(baos.toByteArray()
解决方法
添加代码:
PDAppearanceStream pdStream = new PDAppearanceStream(form.getCOSObject());
PDPageContentStream cStream = new PDPageContentStream(doc,pdStream);
cStream.drawForm(frm);
cStream.close();
非常感谢蒂尔曼豪舍尔。
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