import com.spire.pdf.*;
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 AddCertificate {public static void main(String[]args){//加载PDF文档PdfDocument doc = new PdfDocument();doc.loadFromFile("test.pdf");//加载pfx证书，及证书秘钥PdfCertificate cert = new PdfCertificate("Cermia.pfx","123654yes!");//添加数字签名到指定页面，并设置其位置和大小PdfSignature signature = new PdfSignature(doc, doc.getPages().get(2), cert, "MySignature");Rectangle2D rect = new Rectangle2D.Float();rect.setFrame(new Point2D.Float((float) doc.getPages().get(0).getActualSize().getWidth() - 340, (float) doc.getPages().get(0).getActualSize().getHeight() - 230), new Dimension(280, 150));signature.setBounds(rect);//设置签名为图片加文本模式
        signature.setGraphicMode(GraphicMode.Sign_Image_And_Sign_Detail);//设置签名的内容signature.setNameLabel("签字者：");signature.setName("Mia");signature.setContactInfoLabel("联系电话：");signature.setContactInfo("02881705109");signature.setDateLabel("日期：");signature.setDate(new java.util.Date());signature.setLocationInfoLabel("地点：");signature.setLocationInfo("成都");signature.setReasonLabel("原因：");signature.setReason("文档所有者");signature.setDistinguishedNameLabel("DN: ");signature.setDistinguishedName(signature.getCertificate().get_IssuerName().getName());signature.setSignImageSource(PdfImage.fromFile("sign.png"));//设置签名的字体signature.setSignDetailsFont(new PdfTrueTypeFont(new Font("Arial Unicode MS", Font.PLAIN, 9)));//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("AddSignature.pdf");doc.close();}
}

import com.spire.pdf.*;
import com.spire.pdf.security.PdfSignature;
import com.spire.pdf.widget.PdfFormFieldWidgetCollection;
import com.spire.pdf.widget.PdfFormWidget;
import com.spire.pdf.widget.PdfSignatureFieldWidget;import javax.swing.*;public class ValidateSignature {public static void main(String[]args){//创建PdfDocument实例PdfDocument doc = new PdfDocument();//加载含有签名的PDF文件doc.loadFromFile("SignnedFile.pdf");//获取域集合PdfFormWidget pdfFormWidget = (PdfFormWidget) doc.getForm();PdfFormFieldWidgetCollection pdfFormFieldWidgetCollection = pdfFormWidget.getFieldsWidget();//遍历域for (int i = 0; i < pdfFormFieldWidgetCollection.getCount(); i++) {//判定是否为签名域if (pdfFormFieldWidgetCollection.get(i) instanceof PdfSignatureFieldWidget) {//获取签名域PdfSignatureFieldWidget signatureFieldWidget = (PdfSignatureFieldWidget) pdfFormFieldWidgetCollection.get(i);//获取签名PdfSignature signature = signatureFieldWidget.getSignature();//判定签名是否有效boolean result = signature.verifySignature();if (result) {String str1 =" 有效签名";JOptionPane.showMessageDialog(null,str1);} else {String str2 =" 无效签名";JOptionPane.showMessageDialog(null,str2);}}}}
}