通过手动签名以后可以正常执行签名域的属性
但是通过代码完成签名以后，签名属性不能执行。标记的只读的域还是能操作。
代码如下
KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream(certSrc), certPassword.toCharArray());
String alias = (String) ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias, certPassword.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader(pdfSrc,pdfPassword.getBytes()); //
FileOutputStream fout = new FileOutputStream(new File(donePdfSrc));
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0',null,false);
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setReason(reason);
sap.setLocation(location);
Image image = Image.getInstance(imageSrc);
sap.setSignatureGraphic(image);
String url = SignPDF.class.getResource("simsun.ttc").toString()+",0";
BaseFont bfChinese = BaseFont.createFont(url.toString(),BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);//
Font fontChinese = new Font(bfChinese,12,Font.NORMAL);
sap.setLayer2Font(fontChinese);//
sap.setLayer2Text(reason);//
sap.setLayer4Text("setLayer4Text");//
sap.setRenderingMode(RenderingMode.GRAPHIC_AND_DESCRIPTION);
sap.setVisibleSignature(fieldName);
stp.getWriter().setCompressionLevel(5);
Security.addProvider(new BouncyCastleProvider());
ExternalSignature es = new PrivateKeySignature(key,"SHA-256","BC");
ExternalDigest digest = new BouncyCastleDigest();
MakeSignature.signDetached(sap, digest, es, chain, null, null, null, 0, CryptoStandard.CMS);
有没有哪个大神帮忙解答下，
