对pdf文档进行数字签名
写了个项目，要求对DF文档进行数字签名，核心代码如下：
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public static void sign() throws Exception{// Security.addProvider(new// org.bouncycastle.jce.provider.BouncyCastleProvider());KeyStore ks = KeyStore.getInstance("pkcs12");ks.load(new FileInputStream(cert_path), cert_pwd.toCharArray());String alias = (String)ks.aliases().nextElement();PrivateKey key = (PrivateKey)ks.getKey(alias, cert_pwd.toCharArray());Certificate[] chain = ks.getCertificateChain(alias);PdfReader reader = new PdfReader("F:\\feiqing.pdf");FileOutputStream fout = new FileOutputStream("F:\\signed.pdf");PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');// 最后一个参数为true，允许对同一文档多次签名???//stp = PdfStamper.createSignature(reader, fout, '\0', null, true);PdfSignatureAppearance sap = stp.getSignatureAppearance();sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);sap.setReason("I'm the author");sap.setLocation("Ma");// comment next line to have an invisible signaturesap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);stp.close();}?
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