Java实现添加、验证PDF数字签名的方法示例

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);

                 }

             }

         }

     }

}