Java给PDF签名

1.引入依赖

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>http://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf.free</artifactId>
        <version>2.6.3</version>
    </dependency>
</dependencies>

2.代码

import com.spire.pdf.PdfDocument;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfTrueTypeFont;
import com.spire.pdf.security.GraphicMode;
import com.spire.pdf.security.PdfCertificate;
import com.spire.pdf.security.PdfCertificationFlags;
import com.spire.pdf.security.PdfSignature;

import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

public class ImageSignature {
    public static void main(String[] args) {
//加载PDF文档
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("D:\\keytest\\7.pdf");
//加载pfx证书
        PdfCertificate cert = new PdfCertificate("D:\\keytest\\keystore.p12", "123456");

//添加数字签名，设置其位置和大小
        PdfSignature signature = new PdfSignature(doc, doc.getPages().get(doc.getPages().getCount() - 1), cert, "MySignature");
        Rectangle2D rect = new Rectangle2D.Float();
        rect.setFrame(new Point2D.Float((float) doc.getPages().get(0).getActualSize().getWidth() - 250, (float) doc.getPages().get(0).getActualSize().getHeight() - 300), new Dimension(170, 150));
        signature.setBounds(rect);
//设置签名为图片形式
        signature.setGraphicMode(GraphicMode.Sign_Image_Only);
        signature.setSignImageSource(PdfImage.fromFile("D:\\keytest\\qm.png"));
//设置文档权限为禁止更改
        //signature.setDocumentPermissions(PdfCertificationFlags.Forbid_Changes);
        //signature.setCertificated(true);
//保存文档
        doc.saveToFile("D:\\keytest\\8.pdf");
        doc.close();
    }
}