我想把一个基本的数字签名放在pdf文件上。我想使用设在iText的website.The代码的代码如下 -无法使用itext和java数字签名pdf
public class DigiSign {
public static void main(String a[])
{
try {
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(new FileInputStream("C:\\WSR\\keystore.ks"), "password".toCharArray());
String alias = (String) ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias, "password".toCharArray());
java.security.cert.Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader("C:\\WSR\\a.pdf");
FileOutputStream fout = new FileOutputStream("C:\\WSR\\signed.pdf");
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
sap.setReason("arpit");
sap.setLocation("arpit");
// comment next line to have an invisible signature
sap.setVisibleSignature(new Rectangle(10, 10, 20, 20), 1, null);
stp.close();
} catch (Exception ex) {
Logger.getLogger(DigiSign.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
我创建使用
的keytool -genkey -keyalg RSA -alias MYNAME的关键 - keypass password -keystore keystore.ks -dname“cn = Paulo Soares,c = PT” 并将abc123设置为我的密码。 现在,当我运行这段代码我得到这个例外
Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/DEREncodable
at com.lowagie.text.pdf.PdfSignatureAppearance.getAppearance(Unknown Source)
at com.lowagie.text.pdf.PdfSignatureAppearance.preClose(Unknown Source)
at com.lowagie.text.pdf.PdfSignatureAppearance.preClose(Unknown Source)
at com.lowagie.text.pdf.PdfStamper.close(Unknown Source)
at DigiSign.main(DigiSign.java:42)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.DEREncodable
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
我到底做错了什么?
看起来您已经忘记将Bouncy Castle添加到您的课程路径中(或者有错误的版本)。此外,你应该看看这个[白皮书](http://itextpdf.com/book/digitalsignatures/)。 – mkl 2013-04-06 06:52:52
是的,我确实忘了导入充气城堡到我的项目..添加它..和代码现在正在工作 – user1946152 2013-04-06 14:56:04
哎唷,但您使用的已过时的签名类型。请阅读http://itextpdf.com/book/digitalsignatures,否则当您交付代码时,您的客户会感到非常失望。 – 2013-04-07 09:26:42