signandverify.java

来自「Java生成PDF Java生成PDF Java生成PDF」· Java 代码 · 共 43 行

import org.faceless.pdf2.*;
import java.io.*;
import java.security.GeneralSecurityException;

/**
 * This class creates an empty PDF, signs it with our DummyHandler and
 * then verifies it. Try tweaking the PDF file slightly between the sign
 * and verify stage - you'll find that the signature no longer verifies.
 */
public class SignAndVerify
{
    public static void main(String[] args)
        throws IOException, GeneralSecurityException
    {
        sign();
        verify();
    }

    private static void sign()
        throws IOException, GeneralSecurityException
    {
        PDF pdf = new PDF();
	PDFPage page = pdf.newPage(PDF.PAGESIZE_A4);
	Form form = pdf.getForm();

	SignatureHandlerFactory factory = new DummySignatureHandlerFactory();
	FormSignature sig = new FormSignature(null, null, null, factory);
	form.getElements().put("DummySig", sig);

	pdf.render(new FileOutputStream("Signed.pdf"));
    }

    private static void verify()
        throws IOException, GeneralSecurityException
    {
        PDF pdf = new PDF(new PDFReader(new File("Signed.pdf")));
        FormSignature.registerHandlerForVerification(new DummySignatureHandlerFactory());

	FormSignature sig = (FormSignature)pdf.getForm().getElement("DummySig");
        System.out.println("Verified = "+sig.verify());
    }
}