Java 类com.itextpdf.text.pdf.PdfStamper 实例源码

/**
 * <a href="http://itext.2136553.n4.nabble.com/trying-to-remove-a-signature-from-pdf-file-tt4660983.html">
 * trying to remove a signature from pdf file
 * </a>
 * <br/>
 * <a href="http://itext.2136553.n4.nabble.com/attachment/4660983/0/PDFSignedFirmaCerta.pdf">
 * PDFSignedFirmaCerta.pdf
 * </a>
 * <p>
 * Indeed, this code fails with a {@link NullPointerException}. The cause is that a dubious construct
 * created by the signature software then is processed by iText code not sufficiently defensively programmed:
 * The signature claims to have an annotation on a page but that page does claim not to have any anotations
 * at all.
 * </p>
 */
@Test
public void testRemoveSignatureFromPDFSignedFirmaCerta() throws IOException, GeneralSecurityException, DocumentException
{
    try (   InputStream inputStream = getClass().getResourceAsStream("PDFSignedFirmaCerta.pdf");
            OutputStream outputStream = new FileOutputStream(new File(RESULT_FOLDER, "PDFSignedFirmaCerta-withoutSig.pdf")))
    {
        Provider provider = new BouncyCastleProvider();
        Security.addProvider(provider);

        PdfReader reader = new PdfReader(inputStream, null);
        AcroFields af = reader.getAcroFields();
        ArrayList<String> names = af.getSignatureNames();
        for (String name : names) {
            System.out.println("Signature name: " + name);
            System.out.println("Signature covers whole document: " + af.signatureCoversWholeDocument(name));
            PdfPKCS7 pk = af.verifySignature(name, provider.getName());
            System.out.println("SignatureDate: " + pk.getSignDate());
            System.out.println("Certificate: " + pk.getSigningCertificate());
            System.out.println("Document modified: " + !pk.verify());
            af.removeField(name);
        }
        PdfStamper stamper = new PdfStamper(reader, outputStream, '\0');
        stamper.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/34394199/i-cant-rotate-my-page-from-existing-pdf">
 * I can't rotate my page from existing PDF
 * </a>
 * <p>
 * Switching between portrait and landscape like this obviously will cut off some parts of the page.
 * </p>
 */
@Test
public void testSwitchOrientation() throws DocumentException, IOException
{
    try (InputStream resourceStream = getClass().getResourceAsStream("/mkl/testarea/itext5/extract/n2013.00849449.pdf"))
    {
        PdfReader reader = new PdfReader(resourceStream);
        int n = reader.getNumberOfPages();
        PdfDictionary pageDict;
        for (int i = 1; i <= n; i++) {
            Rectangle rect = reader.getPageSize(i);
            Rectangle crop = reader.getCropBox(i);
            pageDict = reader.getPageN(i);
            pageDict.put(PdfName.MEDIABOX, new PdfArray(new float[] {rect.getBottom(), rect.getLeft(), rect.getTop(), rect.getRight()}));
            pageDict.put(PdfName.CROPBOX, new PdfArray(new float[] {crop.getBottom(), crop.getLeft(), crop.getTop(), crop.getRight()}));
        }
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(new File(RESULT_FOLDER, "n2013.00849449-switch.pdf")));
        stamper.close();
        reader.close();
    }
}

@Test
public void sign50MBrunoAppend() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/50m.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "50m-signedBrunoAppend.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

/**
 * <a href="http://stackoverflow.com/questions/43511558/how-to-set-attributes-for-existing-pdf-that-contains-only-images-using-java-itex">
 * how to set attributes for existing pdf that contains only images using java itext?
 * </a>
 * <p>
 * The OP indicated in a comment that he searches a solution without a second file.
 * This test shows how to work with a single file, by first loading the file into a byte array.
 * </p>
 */
@Test
public void testChangeTitleWithoutTempFile() throws IOException, DocumentException
{
    File singleFile = new File(RESULT_FOLDER, "eg_01-singleFile.pdf");
    try (   InputStream resource = getClass().getResourceAsStream("eg_01.pdf")  )
    {
        Files.copy(resource, singleFile.toPath());
    }

    byte[] original = Files.readAllBytes(singleFile.toPath());

    PdfReader reader = new PdfReader(original);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(singleFile));
    Map<String, String> info = reader.getInfo();
    info.put("Title", "New title");
    info.put("CreationDate", new PdfDate().toString());
    stamper.setMoreInfo(info);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    XmpWriter xmp = new XmpWriter(baos, info);
    xmp.close();
    stamper.setXmpMetadata(baos.toByteArray());
    stamper.close();
    reader.close();
}

/**
 * The OP's original code transformed into Java
 */
void stampTextOriginal(InputStream source, OutputStream target) throws DocumentException, IOException
{
    Date today = new Date();
    PdfReader reader = new PdfReader(source);
    PdfStamper stamper = new PdfStamper(reader, target);
    BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA_BOLD, BaseFont.WINANSI, BaseFont.EMBEDDED);
    int tSize = 24;
    String mark = "DRAFT " + today;
    int angle = 45;
    float height = reader.getPageSizeWithRotation(1).getHeight()/2;
    float width = reader.getPageSizeWithRotation(1).getWidth()/2;
    PdfContentByte cb = stamper.getOverContent(1);
    cb.setColorFill(new BaseColor(255,200,200));
    cb.setFontAndSize(bf, tSize);
    cb.beginText();
    cb.showTextAligned(Element.ALIGN_CENTER, mark, width, height, angle);
    cb.endText();
    stamper.close();
    reader.close();
}

/**
 * The OP's code transformed into Java changed with the work-around.
 */
void stampTextChanged(InputStream source, OutputStream target) throws DocumentException, IOException
{
    Date today = new Date();
    PdfReader reader = new PdfReader(source);
    PdfStamper stamper = new PdfStamper(reader, target);
    BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA_BOLD, BaseFont.WINANSI, BaseFont.EMBEDDED);
    int tSize = 24;
    String mark = "DRAFT " + today;
    int angle = 45;
    float height = reader.getPageSizeWithRotation(1).getHeight()/2;
    float width = reader.getPageSizeWithRotation(1).getWidth()/2;
    PdfContentByte cb = stamper.getOverContent(1);
    cb.setFontAndSize(bf, tSize);
    cb.beginText();
    cb.setColorFill(new BaseColor(255,200,200));
    cb.showTextAligned(Element.ALIGN_CENTER, mark, width, height, angle);
    cb.endText();
    stamper.close();
    reader.close();
}

/**
 * <a href="http://stackoverflow.com/questions/35082653/adobe-reader-cant-display-unicode-font-of-pdf-added-with-itext">
 * Adobe Reader can't display unicode font of pdf added with iText
 * </a>
 * <br/>
 * <a href="https://www.dropbox.com/s/erkv9wot9d460dg/sampleOriginal.pdf?dl=0">
 * sampleOriginal.pdf
 * </a>
 * <p>
 * Indeed, just like in the iTextSharp version of the code, the resulting file has
 * issues in Adobe Reader. With a different starting file, though, it doesn't, cf.
 * {@link #testAddUnicodeStampEg_01()}.
 * </p>
 * <p>
 * As it eventually turns out, Adobe Reader treats PDF files with composite fonts
 * differently if they claim to be PDF-1.2 like the OP's sample file.
 * </p>
 */
@Test
public void testAddUnicodeStampSampleOriginal() throws DocumentException, IOException
{
    try (   InputStream resource = getClass().getResourceAsStream("sampleOriginal.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "sampleOriginal-unicodeStamp.pdf"))  )
    {
        PdfReader reader = new PdfReader(resource);
        PdfStamper stamper = new PdfStamper(reader, result);
        BaseFont bf = BaseFont.createFont("c:/windows/fonts/arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        PdfContentByte cb = stamper.getOverContent(1);

        Phrase p = new Phrase();
        p.setFont(new Font(bf, 25, Font.NORMAL, BaseColor.BLUE));
        p.add("Sample Text");

        ColumnText.showTextAligned(cb, PdfContentByte.ALIGN_LEFT, p, 200, 200, 0);

        stamper.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/35082653/adobe-reader-cant-display-unicode-font-of-pdf-added-with-itext">
 * Adobe Reader can't display unicode font of pdf added with iText
 * </a>
 * <br/>
 * <a href="https://www.dropbox.com/s/erkv9wot9d460dg/sampleOriginal.pdf?dl=0">
 * sampleOriginal.pdf
 * </a>
 * <p>
 * Indeed, just like in the iTextSharp version of the code, the resulting file has
 * issues in Adobe Reader, cf. {@link #testAddUnicodeStampSampleOriginal()}. With
 * a different starting file, though, it doesn't as this test shows.
 * </p>
 * <p>
 * As it eventually turns out, Adobe Reader treats PDF files with composite fonts
 * differently if they claim to be PDF-1.2 like the OP's sample file.
 * </p>
 */
@Test
public void testAddUnicodeStampEg_01() throws DocumentException, IOException
{
    try (   InputStream resource = getClass().getResourceAsStream("eg_01.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "eg_01-unicodeStamp.pdf"))  )
    {
        PdfReader reader = new PdfReader(resource);
        PdfStamper stamper = new PdfStamper(reader, result);

        BaseFont bf = BaseFont.createFont("c:/windows/fonts/arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        PdfContentByte cb = stamper.getOverContent(1);

        Phrase p = new Phrase();
        p.setFont(new Font(bf, 25, Font.NORMAL, BaseColor.BLUE));
        p.add("Sample Text");

        ColumnText.showTextAligned(cb, PdfContentByte.ALIGN_LEFT, p, 200, 200, 0);

        stamper.close();
    }
}

@Test
public void testOPCode() throws IOException, DocumentException
{
    try (   InputStream resourceStream = getClass().getResourceAsStream("/mkl/testarea/itext5/merge/testA4.pdf");
            OutputStream outputStream = new FileOutputStream(new File(RESULT_FOLDER, "testA4-annotate.pdf"))    )
    {
        PdfReader reader = new PdfReader(resourceStream);
        PdfStamper stamper = new PdfStamper(reader, outputStream);

        Rectangle linkLocation = new Rectangle( 100, 700, 100 + 200, 700 + 25 );
        PdfName highlight = PdfAnnotation.HIGHLIGHT_INVERT;
        PdfAnnotation linkRed  = PdfAnnotation.createLink( stamper.getWriter(), linkLocation, highlight, "red" );
        PdfAnnotation linkGreen = PdfAnnotation.createLink( stamper.getWriter(), linkLocation, highlight, "green" );
        BaseColor baseColorRed = new BaseColor(255,0,0);
        BaseColor baseColorGreen = new BaseColor(0,255,0);
        linkRed.setColor(baseColorRed);
        linkGreen.setColor(baseColorGreen);
        double angleDegrees = 10;
        double angleRadians = Math.PI*angleDegrees/180;
        stamper.addAnnotation(linkRed, 1);
        linkGreen.applyCTM(AffineTransform.getRotateInstance(angleRadians));
        stamper.addAnnotation(linkGreen, 1);
        stamper.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/43205385/trying-to-draw-an-ellipse-annotation-and-the-border-on-the-edges-goes-thin-and-t">
 * Trying to draw an ellipse annotation and the border on the edges goes thin and thik when i try to roatate pdf itext5
 * </a>
 * <p>
 * This test creates an ellipse annotation without appearance on a page without rotation. Everything looks ok.
 * </p>
 * @see #testCreateEllipseAppearance()
 * @see #testCreateEllipseOnRotated()
 * @see #testCreateEllipseAppearanceOnRotated()
 * @see #testCreateCorrectEllipseAppearanceOnRotated()
 */
@Test
public void testCreateEllipse() throws IOException, DocumentException
{
    try (   InputStream resourceStream = getClass().getResourceAsStream("/mkl/testarea/itext5/merge/testA4.pdf");
            OutputStream outputStream = new FileOutputStream(new File(RESULT_FOLDER, "testA4-ellipse.pdf"))    )
    {
        PdfReader reader = new PdfReader(resourceStream);
        PdfStamper stamper = new PdfStamper(reader, outputStream);

        Rectangle rect = new Rectangle(202 + 6f, 300, 200 + 100, 300 + 150);

        PdfAnnotation annotation = PdfAnnotation.createSquareCircle(stamper.getWriter(), rect, null, false);
        annotation.setFlags(PdfAnnotation.FLAGS_PRINT);
        annotation.setColor(BaseColor.RED);
        annotation.setBorderStyle(new PdfBorderDictionary(3.5f, PdfBorderDictionary.STYLE_SOLID));

        stamper.addAnnotation(annotation, 1);

        stamper.close();
        reader.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/43205385/trying-to-draw-an-ellipse-annotation-and-the-border-on-the-edges-goes-thin-and-t">
 * Trying to draw an ellipse annotation and the border on the edges goes thin and thik when i try to roatate pdf itext5
 * </a>
 * <p>
 * This test creates an ellipse annotation without appearance on a page with rotation.
 * The ellipse form looks ok but it is moved to the right of the actual appearance rectangle when viewed in Adobe Reader.
 * This is caused by iText creating a non-standard rectangle, the lower left not being the lower left etc.
 * </p>
 * @see #testCreateEllipse()
 * @see #testCreateEllipseAppearance()
 * @see #testCreateEllipseAppearanceOnRotated()
 * @see #testCreateCorrectEllipseAppearanceOnRotated()
 */
@Test
public void testCreateEllipseOnRotated() throws IOException, DocumentException
{
    try (   InputStream resourceStream = getClass().getResourceAsStream("/mkl/testarea/itext5/merge/testA4.pdf");
            OutputStream outputStream = new FileOutputStream(new File(RESULT_FOLDER, "testA4-rotated-ellipse.pdf"))    )
    {
        PdfReader reader = new PdfReader(resourceStream);
        reader.getPageN(1).put(PdfName.ROTATE, new PdfNumber(90));

        PdfStamper stamper = new PdfStamper(reader, outputStream);

        Rectangle rect = new Rectangle(202 + 6f, 300, 200 + 100, 300 + 150);

        PdfAnnotation annotation = PdfAnnotation.createSquareCircle(stamper.getWriter(), rect, null, false);
        annotation.setFlags(PdfAnnotation.FLAGS_PRINT);
        annotation.setColor(BaseColor.RED);
        annotation.setBorderStyle(new PdfBorderDictionary(3.5f, PdfBorderDictionary.STYLE_SOLID));

        stamper.addAnnotation(annotation, 1);

        stamper.close();
        reader.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/43870545/filling-a-pdf-with-itextsharp-and-then-hiding-the-base-layer">
 * Filling a PDF with iTextsharp and then hiding the base layer
 * </a>
 * <p>
 * This test shows how to cover all content using a white rectangle.
 * </p>
 */
@Test
public void testHideContenUnderRectangle() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("document.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "document-hiddenContent.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, result);
        for (int page = 1; page <= pdfReader.getNumberOfPages(); page++)
        {
            Rectangle pageSize = pdfReader.getPageSize(page);
            PdfContentByte canvas = pdfStamper.getOverContent(page);
            canvas.setColorFill(BaseColor.WHITE);
            canvas.rectangle(pageSize.getLeft(), pageSize.getBottom(), pageSize.getWidth(), pageSize.getHeight());
            canvas.fill();
        }
        pdfStamper.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/43870545/filling-a-pdf-with-itextsharp-and-then-hiding-the-base-layer">
 * Filling a PDF with iTextsharp and then hiding the base layer
 * </a>
 * <p>
 * This test shows how to remove all content.
 * </p>
 */
@Test
public void testRemoveContent() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("document.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "document-removedContent.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        for (int page = 1; page <= pdfReader.getNumberOfPages(); page++)
        {
            PdfDictionary pageDictionary = pdfReader.getPageN(page);
            pageDictionary.remove(PdfName.CONTENTS);
        }
        new PdfStamper(pdfReader, result).close();
    }
}

@Test
public void testIdentityTest3() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("test3.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "test3-identity.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, result);
        PdfContentStreamEditor identityEditor = new PdfContentStreamEditor();

        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++)
        {
            identityEditor.editPage(pdfStamper, i);
        }

        pdfStamper.close();
    }
}

@Test
public void testIdentity20150211600() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("/mkl/testarea/itext5/extract/20150211600.PDF");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "20150211600-identity.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, result);
        PdfContentStreamEditor identityEditor = new PdfContentStreamEditor();

        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++)
        {
            identityEditor.editPage(pdfStamper, i);
        }

        pdfStamper.close();
    }
}

@Test
public void testRemoveTransparentGraphicsTest3() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("test3.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "test3-noTransparency.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, result);
        PdfContentStreamEditor editor = new TransparentGraphicsRemover();

        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++)
        {
            editor.editPage(pdfStamper, i);
        }

        pdfStamper.close();
    }
}

@Test
public void testRemoveTransparentGraphicsTransparency() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("transparency.pdf");
            OutputStream result = new FileOutputStream(new File(RESULT_FOLDER, "transparency-noTransparency.pdf")))
    {
        PdfReader pdfReader = new PdfReader(resource);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, result);
        PdfContentStreamEditor editor = new TransparentGraphicsRemover();

        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++)
        {
            editor.editPage(pdfStamper, i);
        }

        pdfStamper.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/30449348/signing-pdf-memory-consumption">
 * Signing PDF - memory consumption
 * </a>
 * <br>
 * <a href="http://50mpdf.tk/50m.pdf">50m.pdf</a>
 * <p>
 * {@link #sign50MNaive()} tests the naive approach,
 * {@link #sign50MBruno()} tests Bruno's original approach,
 * {@link #sign50MBrunoPartial()} tests Bruno's approach with partial reading,
 * {@link #sign50MBrunoAppend()} tests Bruno's approach with append mode, and
 * {@link #sign50MBrunoPartialAppend()} tests Bruno's approach with partial reading and append mode.
 * </p>
 */
// runs with -Xmx240m, fails with -Xmx230m
@Test
public void sign50MNaive() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/50m.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "50m-signedNaive.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0');
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void sign50MBruno() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/50m.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "50m-signedBruno.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, false);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void sign50MBrunoPartial() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/50m.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "50m-signedBrunoPartial.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, false);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void sign50MBrunoPartialAppend() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/50m.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "50m-signedBrunoPartialAppend.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

/**
 * <a href="http://stackoverflow.com/questions/30526254/sign-concatenated-pdf-in-append-mode-with-certified-no-changes-allowed">
 * Sign concatenated PDF in append mode with CERTIFIED_NO_CHANGES_ALLOWED
 * </a>
 * <br>
 * <a href="https://www.dropbox.com/s/lea6r9fup6th44c/test_pdf.zip?dl=0">test_pdf.zip</a>
 * 
 * {@link #signCertifyG()} certifies g.pdf, OK
 * {@link #sign2g()} merely signs 2g.pdf, OK
 * {@link #signCertify2gNoAppend()} certifies 2g.pdf but not in append mode, OK
 * {@link #tidySignCertify2g()} first tidies, then certifies 2g.pdf, OK
 * {@link #signCertify2g()} certifies 2g.pdf, Adobe says invalid
 * {@link #signCertify2gFix()} certifies 2g-fix.pdf, OK!
 * 
 * 2g-fix.pdf is a patched version of 2g.pdf with a valid /Size trailer entry
 * and a valid, single-sectioned cross reference table 
 */
@Test
public void signCertifyG() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/g.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "g-certified.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void sign2g() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/2g.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "2g-signed.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    //appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void signCertify2g() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/2g.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "2g-certified.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void signCertify2gNoAppend() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/2g.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "2g-certified-noAppend.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

@Test
public void signCertify2gFix() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/2g-fix.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "2g-fix-certified.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

public void C2_01_SignHelloWorld_sign(String src, String dest, Certificate[] chain, PrivateKey pk, String digestAlgorithm, String provider, CryptoStandard subfilter, String reason, String location)
        throws GeneralSecurityException, IOException, DocumentException {
    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(src);
    FileOutputStream os = new FileOutputStream(dest);
    PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    appearance.setReason(reason);
    appearance.setLocation(location);
    appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig");
    // Creating the signature
    ExternalDigest digest = new BouncyCastleDigest();
    ExternalSignature signature = new PrivateKeySignature(pk, digestAlgorithm, provider);
    MakeSignature.signDetached(appearance, digest, signature, chain, null, null, null, 0, subfilter);
}

@Test
public void sign2274_2007_H_PROVISIONAL_multifield() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/2274_2007_H_PROVISIONAL - multifield.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "2274_2007_H_PROVISIONAL - multifield-signed.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    //appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature("IntSig1");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

/**
 * <a href="http://stackoverflow.com/questions/32818522/itextsharp-setvisiblesignature-not-working-as-expected">
 * ITextSharp SetVisibleSignature not working as expected
 * </a>
 * <p>
 * The issue observed by the OP (user2699460) occurs since iText(Sharp) 5.5.7
 * both of iText and iTextSharp.
 * </p>
 * <p>
 * The file signed in this sample, test-2-user2699460-signed.pdf, has been created
 * as intermediary result using a simplified version of the OP's c# code. 
 * </p>
 */
@Test
public void signTest_2_user2699460() throws IOException, DocumentException, GeneralSecurityException
{
    String filepath = "src/test/resources/mkl/testarea/itext5/signature/test-2-user2699460.pdf";
    String digestAlgorithm = "SHA512";
    CryptoStandard subfilter = CryptoStandard.CMS;

    // Creating the reader and the stamper
    PdfReader reader = new PdfReader(filepath, null, true);
    FileOutputStream os = new FileOutputStream(new File(RESULT_FOLDER, "test-2-user2699460-signed.pdf"));
    PdfStamper stamper =
        PdfStamper.createSignature(reader, os, '\0', RESULT_FOLDER, true);
    // Creating the appearance
    PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
    //appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);
    appearance.setReason("reason");
    appearance.setLocation("location");
    appearance.setVisibleSignature("Bunker");
    // Creating the signature
    ExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, "BC");
    ExternalDigest digest = new BouncyCastleDigest();
    MakeSignature.signDetached(appearance, digest, pks, chain,
        null, null, null, 0, subfilter);
}

/**
 * <a href="https://stackoverflow.com/questions/45351357/how-to-decrypt-128bit-rc4-pdf-file-in-java-with-user-password-if-it-is-encrpted">
 * How to decrypt 128bit RC4 pdf file in java with user password if it is encrpted with user as well as owner password
 * </a>
 * <br/>
 * <a href="https://www.dropbox.com/s/pc74oox4y19awin/abc.pdf?dl=0">
 * abc.pdf
 * </a>
 * <p>
 * This code shows how to decrypt an encrypted PDF for which you have the
 * user password, not the owner password. The procedure is closely related
 * to <a href="https://stackoverflow.com/a/27876840/1729265">Bruno's answer
 * here</a>.
 * </p> 
 */
@Test
public void testDecryptAbc() throws IOException, DocumentException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException
{
    try (   InputStream inputStream = getClass().getResourceAsStream("abc.pdf");
            OutputStream outputStream = new FileOutputStream(new File(RESULT_FOLDER, "abc-decrypted.pdf"))    )
    {
        PdfReader.unethicalreading = true;
        PdfReader reader = new PdfReader(inputStream, "abc123".getBytes());

        Field encryptedField = PdfReader.class.getDeclaredField("encrypted");
        encryptedField.setAccessible(true);
        encryptedField.set(reader, false);

        PdfStamper stamper = new PdfStamper(reader, outputStream);
        stamper.close();
        reader.close();
    }
}

/**
 * <a href="http://stackoverflow.com/questions/38278816/remove-header-of-a-pdf-using-itext-pdfcleanupprocessor-does-not-work">
 * Remove header of a pdf using iText PdfCleanUpProcessor does not work
 * </a>
 * <br/>
 * <a href="https://www.dropbox.com/s/4u8vupjqc4st3ib/love.pdf?dl=0">
 * love.pdf
 * </a>
 * <p>
 * Cannot reproduce, I get a <code>org.apache.commons.imaging.ImageReadException: Invalid marker found in entropy data</code>.
 * </p>
 */
@Test
public void testRedactLikeShiranSEkanayake() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("love.pdf");
            OutputStream result = new FileOutputStream(new File(OUTPUTDIR, "love-redacted.pdf")) )
    {
        PdfReader reader = new PdfReader(resource);
        PdfStamper stamper = new PdfStamper(reader, result);
        List<PdfCleanUpLocation> cleanUpLocations = new ArrayList<PdfCleanUpLocation>();

        for(int i=1; i<=reader.getNumberOfPages(); i++)
        {
                //System.out.println(i);
                Rectangle mediabox = reader.getPageSize(i); 
                cleanUpLocations.add(new PdfCleanUpLocation(i, new Rectangle(0,800,1000,1000)));
        }
        PdfCleanUpProcessor cleaner = new PdfCleanUpProcessor(cleanUpLocations, stamper);
        cleaner.cleanUp();
        stamper.close();
        reader.close(); 
    }
}

/**
 * <a href="http://stackoverflow.com/questions/38605538/itextpdf-redaction-partly-redacted-text-string-is-fully-removed">
 * itextpdf Redaction :Partly redacted text string is fully removed
 * </a>
 * <br/>
 * <a href="https://drive.google.com/file/d/0B42NqA5UnXMVMDc4MnE5VmU5YVk/view">
 * Document.pdf
 * </a>
 * <p>
 * This indeed is a case which shows that glyphs are completely removed even if their
 * bounding box merely minutely intersects the redaction area. While not desired by
 * the OP, this is how <code>PdfCleanUp</code> works.
 * </p>
 * 
 * @see #testRedactStrictForMayankPandey()
 * @see #testRedactStrictForMayankPandeyLarge()
 */
@Test
public void testRedactLikeMayankPandey() throws IOException, DocumentException
{
    try (   InputStream resource = getClass().getResourceAsStream("Document.pdf");
            OutputStream result = new FileOutputStream(new File(OUTPUTDIR, "Document-redacted.pdf")) )
    {
        PdfReader reader = new PdfReader(resource);
        PdfCleanUpProcessor cleaner= null;
        PdfStamper stamper = new PdfStamper(reader, result);
        stamper.setRotateContents(false);
        List<PdfCleanUpLocation> cleanUpLocations = new ArrayList<PdfCleanUpLocation>();
        Rectangle rectangle = new Rectangle(380, 640, 430, 665);
        cleanUpLocations.add(new PdfCleanUpLocation(1, rectangle, BaseColor.BLACK));
        cleaner = new PdfCleanUpProcessor(cleanUpLocations, stamper);   
        cleaner.cleanUp();
        stamper.close();
        reader.close();
    }
}

/**
 * <a href="https://stackoverflow.com/questions/44304695/itext-5-5-11-bold-text-looks-blurry-after-using-pdfcleanupprocessor">
 * iText 5.5.11 - bold text looks blurry after using PdfCleanUpProcessor
 * </a>
 * <br/>
 * <a href="http://s000.tinyupload.com/index.php?file_id=52420782334200922303">
 * before.pdf
 * </a>
 * <p>
 * Indeed, the observation by the OP can be reproduced. The issue has been introduced
 * into iText in commits d5abd23 and 9967627, both dated May 4th, 2015.
 * </p>
 */
@Test
public void testRedactLikeTieco() throws DocumentException, IOException
{
    try (   InputStream resource = getClass().getResourceAsStream("before.pdf");
            OutputStream result = new FileOutputStream(new File(OUTPUTDIR, "before-redacted.pdf")) )
    {
        PdfReader reader = new PdfReader(resource);
        PdfStamper stamper = new PdfStamper(reader, result);
        List<PdfCleanUpLocation> cleanUpLocations = new ArrayList<PdfCleanUpLocation>();

        cleanUpLocations.add(new PdfCleanUpLocation(1, new Rectangle(0f, 0f, 595f, 680f)));

        PdfCleanUpProcessor cleaner = new PdfCleanUpProcessor(cleanUpLocations, stamper);
        cleaner.cleanUp();

        stamper.close();
        reader.close();
    }
}

public static byte[] stampLayer(InputStream _pdfFile, Image iImage, int x, int y, String layername, boolean readLayers) throws IOException, DocumentException
{
    PdfReader reader = new PdfReader(_pdfFile);

    try (   ByteArrayOutputStream ms = new ByteArrayOutputStream()  )
    {
        PdfStamper stamper = new PdfStamper(reader, ms);
        //Don't delete otherwise the stamper flattens the layers
        if (readLayers)
            stamper.getPdfLayers();

        PdfLayer logoLayer = new PdfLayer(layername, stamper.getWriter());
        PdfContentByte cb = stamper.getUnderContent(1);
        cb.beginLayer(logoLayer);

        //300dpi
        iImage.scalePercent(24f);
        iImage.setAbsolutePosition(x, y);
        cb.addImage(iImage);

        cb.endLayer();
        stamper.close();

        return (ms.toByteArray());
    }
}

/**
 * Update NDA file with visitor name and visitor signature.
 * 
 * @param destFile 
 * @param signatureImage signature file
 * @param visitorName
 * @return File
 */
public static File build(Path destFile, File signatureImage, String visitorName) {
    try {
        PdfReader pdfReader = new PdfReader(ndaUrl);
        PdfStamper pdfStamper = new PdfStamper(pdfReader,
                new FileOutputStream(destFile.toString()));
        Image image = createNDAImage(signatureImage, 0, 0);
        PdfContentByte over = pdfStamper.getOverContent(5);
        over.addImage(image);
        PdfContentByte pdfContentByte = pdfStamper.getOverContent(5);
        pdfContentByte.beginText();
        pdfContentByte.setFontAndSize(BaseFont.createFont
                (BaseFont.HELVETICA, 
                        BaseFont.CP1257, 
                        BaseFont.EMBEDDED
                        )
                , 10); 
        pdfContentByte.setTextMatrix(112, 428); 
        pdfContentByte.showText(visitorName);
        pdfContentByte.setTextMatrix(89, 406);
        pdfContentByte.showText(new SimpleDateFormat("E, dd MMM yyyy").format(new Date()));
        pdfContentByte.endText();
        pdfStamper.close();
        return destFile.toFile();
    } catch (IOException | DocumentException | NumberFormatException e) {
        logger.error("Exception while generating NDA file. ",e);
        return null;
    }
}

public PDFManager(byte[] pdfData, X509Certificate cert) throws Exception {
    reader = new PdfReader(pdfData);
    bout = new ByteArrayOutputStream();
    PdfStamper stp = PdfStamper.createSignature(reader, bout, '\0', null, true);
    numPages = reader.getNumberOfPages();
    x509Certificate = cert;
    sap = stp.getSignatureAppearance();
}

/**
 * Return a stamper for the source reader document that outputs to the provided output stream
 * @param pOutputStream The stamper output stream
 * @param pSourceReader The source document reader
 * @return A stamper that allows the source to be manipulated, output to the provided output stream
 * @throws ExInternal If the stamper could not be opened using the provided reader
 */
private PdfStamper getStamper(OutputStream pOutputStream, PdfReader pSourceReader) throws ExInternal {
  try {
    return new PdfStamper(pSourceReader, pOutputStream);
  }
  catch (IOException | DocumentException e) {
    throw new ExInternal("Failed to create post processing stamper", e);
  }
}

/**
 * Closes the stamper and its associated reader
 * @param pStamper The stamper to close
 * @throws ExInternal If the stamper could not be closed
 */
private void closeStamper(PdfStamper pStamper) throws ExInternal {
  try {
    pStamper.close();
  }
  catch (IOException | DocumentException e) {
    throw new ExInternal("Failed to close post processing stamper", e);
  }
}

/**
 * Render the header/footer to the document on the pages provided in the constructor. Page number placeholders are
 * set during rendering.
 * @param pStamper The stamper used to manipulate the completed document
 */
public void render(PdfStamper pStamper) {
  PdfPTable lTable = getContentTable();
  float lXPosition = mPageAttributes.getMarginLeft();
  float lYPosition = mPositionStrategy.getYPosition(mPageAttributes, lTable.getTotalHeight());
  int lTotalPageCount = pStamper.getReader().getNumberOfPages();

  mPageNumbers.forEach(pPageNumber -> {
    mPageNumberPlaceholders.forEach(pPageNumberPlaceholder -> pPageNumberPlaceholder.setPageNumber(pPageNumber, lTotalPageCount));
    lTable.writeSelectedRows(0, -1, lXPosition, lYPosition, pStamper.getOverContent(pPageNumber));
  });
}

/**
 * This method edits the immediate contents of a page, i.e. its content stream.
 * It explicitly does not descent into form xobjects, patterns, or annotations.
 */
public void editPage(PdfStamper pdfStamper, int pageNum) throws IOException
{
    PdfReader pdfReader = pdfStamper.getReader();
    PdfDictionary page = pdfReader.getPageN(pageNum);
    byte[] pageContentInput = ContentByteUtils.getContentBytesForPage(pdfReader, pageNum);
    page.remove(PdfName.CONTENTS);
    editContent(pageContentInput, page.getAsDict(PdfName.RESOURCES), pdfStamper.getUnderContent(pageNum));
}