java 添加时间戳数字签名到 pdf-ag凯发旗舰厅

本文介绍如何使用spire.pdf for java为pdf文档添加数字签名时添加一个可信时间戳。

import com.spire.pdf.pdfdocument;
import com.spire.pdf.graphics.*;
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 signwithtimestamp {
    public static void main(string[] args) {
        //加载pdf文档
        pdfdocument doc = new pdfdocument();
        doc.loadfromfile("c:\\users\\administrator\\desktop\\introduction.pdf");
        //加载pfx文档
        pdfcertificate cert = new pdfcertificate("c:\\users\\administrator\\desktop\\gary.pfx", "e-iceblue");
        //添加数字签名，设置其位置和大小
        pdfsignature signature = new pdfsignature(doc, doc.getpages().get(0), cert, "mysignature");
        rectangle2d rect = new rectangle2d.float();
        rect.setframe(new point2d.float((float) doc.getpages().get(0).getactualsize().getwidth() - 220, (float) doc.getpages().get(0).getactualsize().getheight() - 140), new dimension(200, 100));
        signature.setbounds(rect);
        //设置签名为文本模式
        signature.setgraphicmode(graphicmode.sign_detail);
        //设置签名的内容
        signature.setnamelabel("签字者：");
        signature.setname("gary");
        signature.setcontactinfolabel("联系电话：");
        signature.setcontactinfo("02881705109");
        signature.setlocationinfolabel("地点：");
        signature.setlocationinfo("成都");
        signature.setreasonlabel("原因：");
        signature.setreason("我是文档所有者");
        //设置签名的字体
        signature.setsigndetailsfont(new pdftruetypefont(new font("宋体", font.plain, 12)));
        //设置文档权限为禁止更改
        signature.setdocumentpermissions(pdfcertificationflags.forbid_changes);
        signature.setcertificated(true);
        //配置时间戳服务器
        string timestampeserverurl = "http://timestamp.digicert.com";
        signature.configuretimestamp(timestampeserverurl);
        //保存文档
        doc.savetofile("output/timestamp.pdf");
        doc.close();
    }
}