itext pdf 签名怎么将签名图片不覆盖文件字

robert_2015 2016-12-19 06:40:17

public static void sign(String srcFile,String targetpdf,String cert_path,String cert_pwd,String img) throws Exception {
KeyStoreFactory ksFactory = KeyStoreFactory.getInstance();
ksFactory.initKeyStore(cert_path, cert_pwd);
PdfReader reader = new PdfReader(srcFile); //源文件
FileOutputStream fout = new FileOutputStream(targetpdf);
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');

Image image = Image.getInstance(img);
//image.setAlignment(Image.UNDERLYING);
Rectangle rect= new Rectangle(300, 800, 400, 675);

PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setSignatureGraphic(image);
sap.setRenderingMode(RenderingMode.GRAPHIC);
sap.setAcro6Layers(true);
sap.setVisibleSignature(rect, 2,null);
sap.setCertificationLevel(PdfSignatureAppearance.NOT_CERTIFIED);

sap.setCrypto(ksFactory.getPrivateKey(cert_pwd), ksFactory.getCertificateChain(), null,PdfSignatureAppearance.WINCER_SIGNED);
sap.setReason("q");
sap.setLocation("q");

stp.getWriter().setCompressionLevel(5);

if (stp != null) {
stp.close();
}
if (fout != null) {
fout.close();
}
if (reader != null) {
reader.close();
}
}

图覆盖到字

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xq1817 2020-03-23

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引用 11 楼 Aulang 的回复:

给app[2]添加透明度，如代码所示： [ [/code]

添加透明度，印章图片颜色会变淡了。还有更好的办法吗

xq1817 2020-03-23

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引用 8 楼帅衡衡的回复:

楼主解决了吗我也在做这个但是我找到方法解决了就是把章的图片变成水印放到文字下方然后签名的图片用一张透明的图片两个位置放在一起就可以了

如果文档已经有签名了，做第二个签名时，按照你的方法就破坏文档的一个签名了。

Aulang 2018-11-01

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给app[2]添加透明度，如代码所示：



package com.itextpdf.text.pdf;



import com.itextpdf.text.*;

import com.itextpdf.text.error_messages.MessageLocalization;

import com.itextpdf.text.pdf.security.CertificateInfo;



import java.security.cert.Certificate;

import java.security.cert.X509Certificate;



public class ExPdfSignatureAppearance extends PdfSignatureAppearance {

    protected static final float TOP_SECTION = 0.3f;

    protected static final float MARGIN = 2;



    private float opacity = 0.75f;



    ExPdfSignatureAppearance(PdfStamperImp writer) {

        super(writer);

    }



    @Override

    public PdfTemplate getAppearance() throws DocumentException {

        PdfTemplate app2 = getLayer(2);



        PdfGState gs = new PdfGState();

        gs.setFillOpacity(opacity);

        app2.setGState(gs);





        String text = "";

        if (getLayer2Text() != null) {

            text = getLayer2Text();

        }



        Font font = new Font();

        float size = font.getSize();



        Rectangle dataRect = null;

        Rectangle signatureRect = null;



        Rectangle rect = getRect();

        int runDirection = getRunDirection();

        Certificate signCertificate = getCertificate();

        Image signatureGraphic = getSignatureGraphic();

        RenderingMode renderingMode = getRenderingMode();





        if (renderingMode == RenderingMode.NAME_AND_DESCRIPTION

                || renderingMode == RenderingMode.GRAPHIC_AND_DESCRIPTION && signatureGraphic != null) {

            // origin is the bottom-left

            signatureRect = new Rectangle(

                    MARGIN,

                    MARGIN,

                    rect.getWidth() / 2 - MARGIN,

                    rect.getHeight() - MARGIN);

            dataRect = new Rectangle(

                    rect.getWidth() / 2 + MARGIN / 2,

                    MARGIN,

                    rect.getWidth() - MARGIN / 2,

                    rect.getHeight() - MARGIN);



            if (rect.getHeight() > rect.getWidth()) {

                signatureRect = new Rectangle(

                        MARGIN,

                        rect.getHeight() / 2,

                        rect.getWidth() - MARGIN,

                        rect.getHeight());

                dataRect = new Rectangle(

                        MARGIN,

                        MARGIN,

                        rect.getWidth() - MARGIN,

                        rect.getHeight() / 2 - MARGIN);

            }

        } else if (renderingMode == RenderingMode.GRAPHIC) {

            if (signatureGraphic == null) {

                throw new IllegalStateException(MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.only"));

            }

            signatureRect = new Rectangle(

                    MARGIN,

                    MARGIN,

                    rect.getWidth() - MARGIN, // take all space available

                    rect.getHeight() - MARGIN);

        } else {

            dataRect = new Rectangle(

                    MARGIN,

                    MARGIN,

                    rect.getWidth() - MARGIN,

                    rect.getHeight() * (1 - TOP_SECTION) - MARGIN);

        }



        switch (renderingMode) {

            case NAME_AND_DESCRIPTION:

                String signedBy = CertificateInfo.getSubjectFields((X509Certificate) signCertificate).getField("CN");

                if (signedBy == null) {

                    signedBy = CertificateInfo.getSubjectFields((X509Certificate) signCertificate).getField("E");

                }

                if (signedBy == null) {

                    signedBy = "";

                }

                Rectangle sr2 = new Rectangle(signatureRect.getWidth() - MARGIN, signatureRect.getHeight() - MARGIN);

                float signedSize = ColumnText.fitText(font, signedBy, sr2, -1, runDirection);



                ColumnText ct2 = new ColumnText(app2);

                ct2.setRunDirection(runDirection);

                ct2.setSimpleColumn(new Phrase(signedBy, font), signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), signedSize, Element.ALIGN_LEFT);



                ct2.go();

                break;

            case GRAPHIC_AND_DESCRIPTION:

                if (signatureGraphic == null) {

                    throw new IllegalStateException(MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.and.description"));

                }

                ct2 = new ColumnText(app2);

                ct2.setRunDirection(runDirection);

                ct2.setSimpleColumn(signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), 0, Element.ALIGN_RIGHT);



                Image im = Image.getInstance(signatureGraphic);

                im.scaleToFit(signatureRect.getWidth(), signatureRect.getHeight());



                Paragraph p = new Paragraph();

                // must calculate the point to draw from to make image appear in middle of column

                float x = 0;

                // experimentation found this magic number to counteract Adobe's signature graphic, which

                // offsets the y co-ordinate by 15 units

                float y = -im.getScaledHeight() + 15;



                x = x + (signatureRect.getWidth() - im.getScaledWidth()) / 2;

                y = y - (signatureRect.getHeight() - im.getScaledHeight()) / 2;

                p.add(new Chunk(im, x + (signatureRect.getWidth() - im.getScaledWidth()) / 2, y, false));

                ct2.addElement(p);

                ct2.go();

                break;

            case GRAPHIC:

                ct2 = new ColumnText(app2);

                ct2.setRunDirection(runDirection);

                ct2.setSimpleColumn(signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), 0, Element.ALIGN_RIGHT);



                im = Image.getInstance(signatureGraphic);

                im.scaleToFit(signatureRect.getWidth(), signatureRect.getHeight());



                p = new Paragraph(signatureRect.getHeight());

                // must calculate the point to draw from to make image appear in middle of column

                x = (signatureRect.getWidth() - im.getScaledWidth()) / 2;

                y = (signatureRect.getHeight() - im.getScaledHeight()) / 2;

                p.add(new Chunk(im, x, y, false));

                ct2.addElement(p);

                ct2.go();

                break;

            default:

                break;

        }



        if (renderingMode != RenderingMode.GRAPHIC) {

            if (size <= 0) {

                Rectangle sr = new Rectangle(dataRect.getWidth(), dataRect.getHeight());

                size = ColumnText.fitText(font, text, sr, 12, runDirection);

            }

            ColumnText ct = new ColumnText(app2);

            ct.setRunDirection(runDirection);

            ct.setSimpleColumn(new Phrase(text, font), dataRect.getLeft(), dataRect.getBottom(), dataRect.getRight(), dataRect.getTop(), size, Element.ALIGN_LEFT);

            ct.go();

        }



        return super.getAppearance();

    }



    public float getOpacity() {

        return opacity;

    }



    public void setOpacity(float opacity) {

        if (opacity > 0 && opacity <= 1) {

            this.opacity = opacity;

        }

    }

}



package com.itextpdf.text.pdf;



import com.itextpdf.text.DocumentException;



import java.io.IOException;

import java.io.OutputStream;



public class ExPdfStamper extends PdfStamper {

    public static PdfStamper createSignature(final PdfReader reader, final OutputStream os) throws DocumentException, IOException {

        ByteBuffer bout = new ByteBuffer();

        PdfStamper stp = new PdfStamper(reader, bout, '\u0000', true);

        stp.sigApp = new ExPdfSignatureAppearance(stp.stamper);

        stp.sigApp.setSigout(bout);

        stp.sigApp.setOriginalout(os);

        stp.sigApp.setStamper(stp);

        stp.hasSignature = true;

        PdfDictionary catalog = reader.getCatalog();

        PdfDictionary acroForm = (PdfDictionary) PdfReader.getPdfObject(catalog.get(PdfName.ACROFORM), catalog);

        if (acroForm != null) {

            acroForm.remove(PdfName.NEEDAPPEARANCES);

            stp.stamper.markUsed(acroForm);

        }

        return stp;

    }

}

Aulang 2018-10-29

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Itext7实现：



public class ExPdfSigner extends PdfSigner {

    public ExPdfSigner(PdfReader reader, OutputStream outputStream, boolean append) throws IOException {

        super(reader, outputStream, append);

    }



    public ExPdfSigner(PdfReader reader, OutputStream outputStream, String path, boolean append) throws IOException {

        super(reader, outputStream, path, append);

    }



    @Override

    protected void preClose(Map<PdfName, Integer> exclusionSizes) throws IOException {

        appearance.setLayer2Text("").setRenderingMode(PdfSignatureAppearance.RenderingMode.DESCRIPTION);



        int page = appearance.getPageNumber();

        Rectangle rectangle = appearance.getPageRect();



        Image image = new Image(appearance.getSignatureGraphic());

        image.setWidth(rectangle.getWidth()).setHeight(rectangle.getHeight()).setOpacity(0.75f);

        image.setFixedPosition(page, rectangle.getLeft(), rectangle.getBottom());



        Document doc = new Document(document).add(image);



        doc.getRenderer().flush();

        doc.getRenderer().close();



        super.preClose(exclusionSizes);

    }

}

思路是设置图片透明度，IText的实现盖章的图片无法设置透明度，就把电子签名和签名图片分开，签名图片单独作为图片添加。
回复一下，做个标记，方便以后的人参考。

帅衡衡 2017-04-27

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楼主解决了吗我也在做这个但是我找到方法解决了就是把章的图片变成水印放到文字下方然后签名的图片用一张透明的图片两个位置放在一起就可以了

robert_2015 2016-12-29

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顶一下啊，有没有大哥会啊

bcsflilong 2016-12-20

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我有个问题虽然我不太明白这块的东西？你这个要求是客户提的需求吗？按照正常来说那个签章盖住文字不是正常吗如果签章在下面那不就是背景水印了吗？还做电子签章做什么？

robert_2015 2016-12-20

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有没有大牛啊，自己顶

robert_2015 2016-12-20

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引用 5 楼 bcsflilong 的回复:

我有个问题虽然我不太明白这块的东西？你这个要求是客户提的需求吗？按照正常来说那个签章盖住文字不是正常吗如果签章在下面那不就是背景水印了吗？还做电子签章做什么？

因为这个章有可能覆盖住文字，影响文档的可读性（特别是图纸类的，如果在上面有可能会盖住参数）不然就可能要重新找空白位置签，我们现实的红章盖在纸上的字上，还是可以看到文字的

robert_2015 2016-12-19

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引用 1 楼 rumlee的回复:

调用pdfpwriter的getDirectContentUnder()方法获取PdfContentByte对象,再通过调用PdfContentByte的addimg方法可以将图片添加到文字下方,

sap.setSignatureGraphic(image); 上面已添加了图片

robert_2015 2016-12-19

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引用 1 楼 rumlee的回复:

调用pdfpwriter的getDirectContentUnder()方法获取PdfContentByte对象,再通过调用PdfContentByte的addimg方法可以将图片添加到文字下方,

但是这种签名的怎么写，大哥

rumlee 2016-12-19

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调用pdfpwriter的getDirectContentUnder()方法获取PdfContentByte对象,再通过调用PdfContentByte的addimg方法可以将图片添加到文字下方,

itext官方数字签名白皮书我只翻译了我用到的一部分关于数字证书加密的内容其他的关联内容并没有翻译

用keytool生成数字证书，利用itext生成签名pdf，完整工程代码。

将word转换成pdf确实有很多种方案！最近正好需要做一个这样的功能，需求是将word模板进行签名后转换为pdf。为此，我花了一点时间去网上找方案。这里记录一下最终的方案：利用poi+itextpdf进行word转pdf。此资源按包含源码和maven依赖。

java实现pdf文件电子签名,可以直接在eclipse上运行，采用itextpdf，pdfbox 两种方式实现！！！

NULL 博文链接：https://swordshadow.iteye.com/blog/1980063

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itext pdf 签名 怎么将签名图片不覆盖文件字

itext pdf 签名怎么将签名图片不覆盖文件字