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xiaobai8899 / 历经一个月总结使用java实现pdf文件的电子签字+盖章+防伪二维码+水印+PDF文件加密的全套解决方案

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README

历经一个月总结使用java实现pdf文件的电子签字+盖章+防伪二维码+水印+PDF文件加密的全套解决方案

一、前言

九月中旬到十月底,我和同事参加了某个系统的开发,涉及到对PDF的电子签字+盖章+防伪二维码+水印等,我最开始选择使用pageoffice实现PDF的盖章和签字,并且也写了一篇博客来进行详细的介绍(pageoffice实现签名盖章:http://t.csdn.cn/nNxpe),但是出现一个问题,PageOffice支持JAVA、ASP.NET、PHP多种编程开发语言,使开发集成简单高效,事半功倍。让集成PAGEOFFICE的协同办公系统更具价值,但是他是卓正软件公司的一个项目,需要收费,并且安全系数不一定能得到保证,而这个项目需要上生产,所以经过多方的研究,学习,总结,今天终于将一套PDF集成线上签字+盖章+防伪二维码+水印的一系列解决方法总结出来,今天写这篇博客进行开源

二、使用itextPDF实现PDF电子公章工具类

1、电子公章的制作

我们需要实现电子公章盖章,但是不能使用公司的章,我们这次推荐使用的线上做章工具来模拟电子印章

  • 然后输入公司名,输入章名输入编码然后点击395生成,最后点击保存图片,我们的个人专业章就实现了

  • 电子公章效果如图:

  • PDF模板图

  • 生成PDF效果图

2、itextPDF的相关依赖

      <!-- itextpdf依赖 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.10</version>
        </dependency>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>
         <dependency>
             <!-- 摘要算法 -->
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
  • 使用的是boot项目,所以完整依赖是
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.5.RELEASE</version>
</parent>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- itextpdf依赖 -->
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.5.10</version>
    </dependency>
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itext-asian</artifactId>
      <version>5.2.0</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
  </dependencies>

3、相关配置及数字签名的配置

(1)摘要算法

  • 我们项目启动之后报错

  • 需要加这个配置文件就不报错了,这个主要原因是摘要算法没有,需要引入相关依赖
   <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
  • 涉及到加密算法就需要数字签名了(数字签名格式,CMS,CADE),我们就需要一个文件(我的命名是:server.p12)这个东西需要我们自己电脑生成数字签名

(2)java工具keytool生成p12数字证书文件

Keytool是用于管理**和证书的工具,位于%JAVA_HOME%/bin目录。 使用JDK的keytool工具

  • keytool在jdk的bin目录下

2. 打开keytool所在的bin目录,然后在上面的路径显示框中输入CMD,然后回车,即可在当前文件夹下打开命令提示符,并且路径是当前文件夹。

  • 生成数字文件,在命令行输入
keytool -genkeypair -alias whj -keypass 111111 -storepass 111111 -dname C=CN,ST=SD,L=QD,O=haier,OU=dev,CN=haier.com -keyalg RSA -keysize 2048 -validity 3650 -keystore D:\keystore\server.keystore

参数解释:

storepass keystore 文件存储密码
keypass 私钥加解密密码
alias 实体别名(包括证书私钥)
dname 证书个人信息
keyalt 采用公钥算法,默认是DSA keysize **长度(DSA算法对应的默认算法是sha1withDSA,不支持2048长度,此时需指定RSA)
validity 有效期
keystore 指定keystore文件

  • 转换为p12格式

在命令行输入

keytool -importkeystore -srckeystore D:\keystore\server.keystore -destkeystore D:\keystore\whj.p12 -srcalias whj -destalias serverkey -srcstoretype jks -deststoretype pkcs12 -srcstorepass 111111 -deststorepass 111111 -noprompt

  • 生成的最终文件

4、项目结构及源码

  • 工具类(可以直接复制)
package com.whj.pdf;


import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.security.*;
import com.whj.entity.SignatureInfo;

import java.io.*;
import java.security.GeneralSecurityException;


/**
 * @author 王恒杰
 * @date 2022/10/13 22:52
 * @Description:盖章功能工具类
 */
public class ItextUtil {

    public static final char[] PASSWORD = "111111".toCharArray();// keystory密码

    /**
     * 单多次签章通用
     *
     * @param src
     * @param target
     * @param signatureInfo
     * @throws GeneralSecurityException
     * @throws IOException
     * @throws DocumentException
     */
    @SuppressWarnings("resource")
    public void sign(String src, String target, SignatureInfo signatureInfo) {
        InputStream inputStream = null;
        FileOutputStream outputStream = null;
        ByteArrayOutputStream result = new ByteArrayOutputStream();
        try {
            inputStream = new FileInputStream(src);
            ByteArrayOutputStream tempArrayOutputStream = new ByteArrayOutputStream();
            PdfReader reader = new PdfReader(inputStream);
            // 创建签章工具PdfStamper ,最后一个boolean参数是否允许被追加签名
            // false的话,pdf文件只允许被签名一次,多次签名,最后一次有效
            // true的话,pdf可以被追加签名,验签工具可以识别出每次签名之后文档是否被修改
            PdfStamper stamper = PdfStamper.createSignature(reader,
                    tempArrayOutputStream, '\0', null, true);
            // 获取数字签章属性对象
            PdfSignatureAppearance appearance = stamper
                    .getSignatureAppearance();
            appearance.setReason(signatureInfo.getReason());
            appearance.setLocation(signatureInfo.getLocation());
            // 设置签名的位置,页码,签名域名称,多次追加签名的时候,签名预名称不能一样 图片大小受表单域大小影响(过小导致压缩)
            // 签名的位置,是图章相对于pdf页面的位置坐标,原点为pdf页面左下角
            // 四个参数的分别是,图章左下角x,图章左下角y,图章右上角x,图章右上角y
            //四个参数的分别是,图章左下角x,图章左下角y,图章右上角x,图章右上角y
            appearance.setVisibleSignature(new Rectangle(280, 220, 140, 600), 1, "sig1");
            // 读取图章图片
            Image image = Image.getInstance(signatureInfo.getImagePath());
            appearance.setSignatureGraphic(image);
            appearance.setCertificationLevel(signatureInfo
                    .getCertificationLevel());
            // 设置图章的显示方式,如下选择的是只显示图章(还有其他的模式,可以图章和签名描述一同显示)
            appearance.setRenderingMode(signatureInfo.getRenderingMode());
            // 这里的itext提供了2个用于签名的接口,可以自己实现,后边着重说这个实现
            // 摘要算法
            ExternalDigest digest = new BouncyCastleDigest();
            // 签名算法
            ExternalSignature signature = new PrivateKeySignature(
                    signatureInfo.getPk(), signatureInfo.getDigestAlgorithm(),
                    null);
            // 调用itext签名方法完成pdf签章 //数字签名格式,CMS,CADE
            MakeSignature.signDetached(appearance, digest, signature,
                    signatureInfo.getChain(), null, null, null, 0,
                    MakeSignature.CryptoStandard.CADES);

            inputStream = new ByteArrayInputStream(
                    tempArrayOutputStream.toByteArray());
            // 定义输入流为生成的输出流内容,以完成多次签章的过程
            result = tempArrayOutputStream;

            outputStream = new FileOutputStream(new File(target));
            outputStream.write(result.toByteArray());
            outputStream.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != outputStream) {
                    outputStream.close();
                }
                if (null != inputStream) {
                    inputStream.close();
                }
                if (null != result) {
                    result.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
  • 实体类
package com.whj.entity;

import com.itextpdf.text.pdf.PdfSignatureAppearance;

import java.security.PrivateKey;
import java.security.cert.Certificate;

/**
 * @author 王恒杰
 * @date 2022/10/13 22:52
 * @Description:
 */
public class SignatureInfo {
    private String reason; //签名的原因,显示在pdf签名属性中
    private String location;//签名的地点,显示在pdf签名属性中
    private String digestAlgorithm;//摘要算法名称,例如SHA-1
    private String imagePath;//图章路径
    private String fieldName;//表单域名称
    private Certificate[] chain;//证书链
    private PrivateKey pk;//签名私钥
    private int certificationLevel = 0; //批准签章
    private PdfSignatureAppearance.RenderingMode renderingMode;//表现形式:仅描述,仅图片,图片和描述,签章者和描述
    //图章属性
    private float rectllx;//图章左下角x
    private float rectlly;//图章左下角y
    private float recturx;//图章右上角x
    private float rectury;//图章右上角y

    public float getRectllx() {
        return rectllx;
    }

    public void setRectllx(float rectllx) {
        this.rectllx = rectllx;
    }

    public float getRectlly() {
        return rectlly;
    }

    public void setRectlly(float rectlly) {
        this.rectlly = rectlly;
    }

    public float getRecturx() {
        return recturx;
    }

    public void setRecturx(float recturx) {
        this.recturx = recturx;
    }

    public float getRectury() {
        return rectury;
    }

    public void setRectury(float rectury) {
        this.rectury = rectury;
    }

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    public String getDigestAlgorithm() {
        return digestAlgorithm;
    }

    public void setDigestAlgorithm(String digestAlgorithm) {
        this.digestAlgorithm = digestAlgorithm;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }

    public String getFieldName() {
        return fieldName;
    }

    public void setFieldName(String fieldName) {
        this.fieldName = fieldName;
    }

    public Certificate[] getChain() {
        return chain;
    }

    public void setChain(Certificate[] chain) {
        this.chain = chain;
    }

    public PrivateKey getPk() {
        return pk;
    }

    public void setPk(PrivateKey pk) {
        this.pk = pk;
    }

    public int getCertificationLevel() {
        return certificationLevel;
    }

    public void setCertificationLevel(int certificationLevel) {
        this.certificationLevel = certificationLevel;
    }

    public PdfSignatureAppearance.RenderingMode getRenderingMode() {
        return renderingMode;
    }

    public void setRenderingMode(PdfSignatureAppearance.RenderingMode renderingMode) {
        this.renderingMode = renderingMode;
    }


}
  • 测试
package com.whj.pdf;

import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.security.DigestAlgorithms;
import com.whj.entity.SignatureInfo;

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;

import static com.whj.pdf.ItextUtil.PASSWORD;

/**
 * @author 王恒杰
 * @date 2022/10/24 10:42
 * @Description:  盖章功能实现
 */
public class PdfStamp {
    public static void main(String[] args) {
        try {
            ItextUtil app = new ItextUtil();
            // 将证书文件放入指定路径,并读取keystore ,获得私钥和证书链
            String pkPath = "src/main/resources/whj.p12";
            KeyStore ks = KeyStore.getInstance("PKCS12");
            ks.load(new FileInputStream(pkPath), PASSWORD);
            String alias = ks.aliases().nextElement();
            PrivateKey pk = (PrivateKey) ks.getKey(alias, PASSWORD);
            // 得到证书链
            Certificate[] chain = ks.getCertificateChain(alias);
            //需要进行签章的pdf
            String path = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\程序员小王.pdf";
            // 封装签章信息
            SignatureInfo signInfo = new SignatureInfo();
            signInfo.setReason("理由");
            signInfo.setLocation("位置");
            signInfo.setPk(pk);
            signInfo.setChain(chain);
            signInfo.setCertificationLevel(PdfSignatureAppearance.NOT_CERTIFIED);
            signInfo.setDigestAlgorithm(DigestAlgorithms.SHA1);
            signInfo.setFieldName("demo");

            // 签章图片
            signInfo.setImagePath("D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\chapter.png");
            signInfo.setRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
            //// 值越大,代表向x轴坐标平移 缩小 (反之,值越小,印章会放大)
            signInfo.setRectllx(100);
            //// 值越大,代表向y轴坐标向上平移(大小不变)
            signInfo.setRectlly(200);
            // 值越大   代表向x轴坐标向右平移  (大小不变)
            signInfo.setRecturx(150);
            // 值越大,代表向y轴坐标向上平移(大小不变)
            signInfo.setRectury(150);

            //签章后的pdf路径
            app.sign(path, "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\out.pdf", signInfo);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

5、结果展示

三、thymeleaf+itext签字功能+PDF文件加密实现

  • 所以需依赖

  • 需要手工导入一个jar包(jar包我放在了源码里面,需要自行下载)

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.5.RELEASE</version>
</parent>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- itextpdf依赖 -->
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.5.10</version>
    </dependency>
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itext-asian</artifactId>
      <version>5.2.0</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <!--guava是来自Google的Java核心类库。包含了新的集合类型(例如:复合map、复合set)、
    不可变集合,以及一些对于并发、I/O、hashing、缓存、原型、字符串等的通用功能。
    guava被广泛使用在Google的项目中,也被广泛的使用在其他公司里。-->
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>25.0-jre</version>
    </dependency>
  </dependencies>

因为这个的相关类太多,只展示了核心代码,全部代码请到博客底部下载源码

1、签字图片上传和签字实现的Controller

package com.whj.controller;

import com.whj.service.SignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

/**
 * @author 王恒杰
 * @date 2022/10/24 13:57
 * @Description: 实现签字上传和签字功能
 */
@RestController
@RequestMapping("/sign")
public class SignController {
    @Autowired
    private SignService signService;

    @PostMapping(value = "/uploadSign")
    @ResponseBody
    public String uploadSign(String img) {
        return signService.uploadSign(img);
    }


    @PostMapping(value = "/sign")
    @ResponseBody
    public String sign() {
        return signService.sign(id);
    }
}

2、签字上传,签字,PDF文件加密业务层实现

/**
 * @author 王恒杰
 * @date 2022/10/24 14:00
 * @Description:
 */
@Service
public class SignServiceImpl implements  SignService{
    @Override
    public String uploadSign(String img) {

        //String idCard="3000";
        // 生成jpeg图片 idCard.asString()
        String url = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\img\\sign.png";

        try {
            if (img == null) // 图像数据为空
            {
                return "no";
            }
            int i = img.indexOf("base64,") + 7;//获取前缀data:image/gif;base64,的坐标
            String newImage = img.substring(i, img.length());//去除前缀

            BASE64Decoder decoder = new BASE64Decoder();
            // Base64解码
            byte[] bytes = decoder.decodeBuffer(newImage);

            for (int j = 0; j < bytes.length; ++j) {
                if (bytes[j] < 0) {// 调整异常数据
                    bytes[j] += 256;
                }
            }

            OutputStream out = new FileOutputStream(url);

            out.write(bytes);
            out.flush();
            out.close();
            return "yes";
        } catch (Exception e) {
            return "no";
        }
    }

    @Override
    public String sign() {
            try {
                //初始化文件
                String srcPath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\out.pdf";
                //输出文件
                String outPath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\signOut.pdf";

                signimg("D:\\Idea\\stamp\\Itext\\src\\main\\resources\\img\\sign.png", srcPath, "批准人", outPath);
                //加密
                EncryptPDFUtil.encryptPDF(outPath, "EncryptPDF");

                return "yes";
            } catch (Exception e) {
                return "no";
            }
    }

  • 封装签字的方法
    public static void signimg(String imgurl, String pdfurl, String keywords, String outPDFPath) throws IOException {
        List list = new ArrayList();
        SignPDFBean bean1 = new SignPDFBean();
        bean1.setKeyStorePass("111111");
        bean1.setKeyStorePath("src/main/resources/server.p12");
        bean1.setKeyWord(keywords);
        bean1.setSealPath(imgurl);
        bean1.setSignLocation(keywords);
        bean1.setSignReason("计量检定证书签字");


        list.add(bean1);


        SignPDFRequestBean requestBean = new SignPDFRequestBean();
        requestBean.setSrcPDFPath(pdfurl);
        requestBean.setOutPDFPath(outPDFPath);
        requestBean.setSignPDFBeans(list);

        long startTime = System.currentTimeMillis();
        // 1.解析pdf文件
        Map<Integer, List<KeyWordBean>> map = KeywordPDFUtils.getPDFText(requestBean.getSrcPDFPath());
        // 2.获取关键字坐标
        List<SignPDFBean> beans = requestBean.getSignPDFBeans();
        byte[] fileData = null;
        InputStream in = null;
        for (int i = 0; i < beans.size(); i++) {
            SignPDFBean pdfBean = beans.get(i);
            KeyWordBean bean = KeywordPDFUtils.getKeyWordXY1(map, pdfBean.getKeyWord());
            if (null == bean) {
                System.out.println("未查询到关键字。。。");
            }
            System.out.println("111" + bean.toString());
            long keyTime = System.currentTimeMillis();
            if (i == 0) {
                in = new FileInputStream(requestBean.getSrcPDFPath());
            } else {
                in = new ByteArrayInputStream(fileData);
            }
            // 3.进行盖章
            fileData = SignPDFUtils.sign(pdfBean.getKeyStorePass(), pdfBean.getKeyStorePath(), in, pdfBean.getSealPath(), bean.getX(), bean.getY(), bean.getPage(), pdfBean.getSignReason(), pdfBean.getSignLocation());
            long signTime = System.currentTimeMillis();
        }
        // 4.输出盖章后pdf文件
        FileOutputStream f = new FileOutputStream(new File(requestBean.getOutPDFPath()));
        f.write(fileData);
        f.close();
        in.close();

        long endTime = System.currentTimeMillis();
        System.out.println("总时间:" + (endTime - startTime));
    }

}

3、封装的实现PDF加密文件的方法

package com.whj.util;



import com.spire.pdf.PdfDocument;
import com.spire.pdf.security.PdfEncryptionKeySize;
import com.spire.pdf.security.PdfPermissionsFlags;

import java.util.EnumSet;

/**
 * @author 王恒杰
 * @date 2022/10/18 9:26
 * @Description:   将PDF加密的工具类
 */
public  class EncryptPDFUtil {
    public static void encryptPDF(String startFileName,String EncryptPDF) {
        //创建PdfDocument实例
        PdfDocument doc = new PdfDocument();
        //加载PDF文件
        doc.loadFromFile(startFileName);
        //添加一个空白页,目的为了删除jar包添加的水印,后面再移除这一页
        doc.getPages().add();
        //加密PDF文件
        PdfEncryptionKeySize keySize = PdfEncryptionKeySize.Key_128_Bit;
        String openPassword = "123456";//打开文档时,仅用于查看文档
        String permissionPassword = "test";//打开文档时,可编辑文档
        EnumSet flags = EnumSet.of(PdfPermissionsFlags.Print, PdfPermissionsFlags.Fill_Fields);
        doc.getSecurity().encrypt(openPassword, permissionPassword, flags, keySize);
        //移除第一个页
        doc.getPages().remove(doc.getPages().get(doc.getPages().getCount()-1));
        //保存文件
        doc.saveToFile("src/main/resources/pdf/EncryptPDF/"+EncryptPDF+".pdf");

        doc.close();
    }
}

4、签字前端(thymeleaf实现)

  • 配置文件
server.port=8081
spring.thymeleaf.prefix=classpath:/templates/
  • 前端源码
<!DOCTYPE html>
<html>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <!--<meta name="viewport" content="initial-scale=1,width=device-width, height=device-height,user-scalable=no,maximum-scale=1, minimum-scale=1" />
         <meta name="apple-mobile-web-app-capable" content="yes">
          <meta name="apple-mobile-web-app-status-bar-style" content="black">
          <meta name="format-detection" content="telephone=no">-->
  <!--<script src="http://www.jq22.com/jquery/2.1.1/jquery.min.js"></script>-->
  <title>手写签名</title>
  <script type="text/javascript" src="../jquery-3.1.1.min.js" ></script>
  <script type="text/javascript" src="../ajaxfileupload.js" ></script>
  <style type="text/css">
    #canvas {}
  </style>
</head>
  <body id="bb">
    <div id="canvasDiv"></div>
    <br><br><br>
    <button id="btn_clear">清除</button>
    <button id="btn_submit">提交</button>
    <script language="javascript">

  try
   {
   function onDocumentTouchStart(event) {
        if(event.touches.length == 1) {
          event.preventDefault();
          // Faking double click for touch devices
          var now = new Date().getTime();
          if(now - timeOfLastTouch < 250) {
            reset();
            return;
          }
          timeOfLastTouch = now;
          mouseX = event.touches[0].pageX;
          mouseY = event.touches[0].pageY;
          isMouseDown = true;
        }
      }
      function onDocumentTouchMove(event) {
        if(event.touches.length == 1) {
          event.preventDefault();
          mouseX = event.touches[0].pageX;
          mouseY = event.touches[0].pageY;
        }
      }
      function onDocumentTouchEnd(event) {
        if(event.touches.length == 0) {
          event.preventDefault();
          isMouseDown = false;
        }
      }
      var canvasDiv = document.getElementById('canvasDiv');
      var canvas = document.createElement('canvas');
      var canvasWidth = 1191;
      var canvasHeight = 670;
      document.addEventListener('touchmove', onDocumentTouchMove, false);
      /*document.addEventListener('touchstart', onDocumentTouchStart, true);
      document.addEventListener('touchend', onDocumentTouchEnd, true);*/
      var point = {};
      point.notFirst = false;
      canvas.setAttribute('width', canvasWidth);
      canvas.setAttribute('height', canvasHeight);
      canvas.setAttribute('id', 'canvas');
      canvasDiv.appendChild(canvas);
      if(typeof G_vmlCanvasManager != 'undefined') {
        canvas = G_vmlCanvasManager.initElement(canvas);
      }
      var context = canvas.getContext("2d");
      var img = new Image();
      img.src = "./write.jpg";
      img.onload = function() {
        var ptrn = context.createPattern(img, 'no-repeat');
        context.fillStyle = ptrn;
        context.fillRect(0, 0, canvas.width, canvas.height);
      }
      canvas.addEventListener("touchstart", function(e) {
        console.log("touchstart");
        var mouseX = e.touches[0].pageX - this.offsetLeft;
        var mouseY = e.touches[0].pageY - this.offsetTop;
        paint = true;
        addClick(e.touches[0].pageX - this.offsetLeft, e.touches[0].pageY - this.offsetTop);
        redraw();
      });
      canvas.addEventListener("touchend", function(e) {
        console.log("touchend");
        paint = false;
      });
      canvas.addEventListener("touchmove", function(e) {
        console.log("touchmove");
        console.log(e);
        console.log("触摸坐标:"+(e.touches[0].clientX - this.offsetLeft)+","+(e.touches[0].clientY - this.offsetTop));
        if(paint) {
          addClick(e.touches[0].pageX - this.offsetLeft, e.touches[0].pageY - this.offsetTop, true);
          redraw();
        }
      });
      canvas.addEventListener("mousedown", function(e) {
        console.log("mousedown");
        var mouseX = e.pageX - this.offsetLeft;
        var mouseY = e.pageY - this.offsetTop;
        paint = true;
        addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop);
        redraw();
      });
      canvas.addEventListener("mousemove", function(e) {
        console.log(e);
        /*console.log(this.offsetLeft);
        console.log(this.offsetTop);*/
        console.log("鼠标坐标:"+(e.pageX - this.offsetLeft)+","+(e.pageY - this.offsetTop));
        console.log("mousemove");
        if(paint) {
          addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop, true);
          redraw();
        }
      });
      canvas.addEventListener("mouseup", function(e) {
        console.log("mouseup");
        paint = false;
      });
      canvas.addEventListener("mouseleave", function(e) {
        console.log("mouseleave");
        paint = false;
      });
      var clickX = new Array();
      var clickY = new Array();
      var clickDrag = new Array();
      var paint;
      function addClick(x, y, dragging)
      {
        clickX.push(x);
        clickY.push(y);
        clickDrag.push(dragging);
        console.debug(clickDrag);
      }
      function redraw() {
        
        //canvas.width = canvas.width; // Clears the canvas
        context.strokeStyle = "black";
        context.lineJoin = "round";
        context.lineWidth = 5;
        while(clickX.length > 0) {
          
          point.bx = point.x;
          point.by = point.y;
          point.x = clickX.pop();
          point.y = clickY.pop();
          console.log(point.x);
          console.log(point.y);
          /*alert(point.x);
          alert(point.y);*/
          point.drag = clickDrag.pop();
          context.beginPath();
          if(point.drag && point.notFirst) {
            context.moveTo(point.bx, point.by);
          } else {
            point.notFirst = true;
            context.moveTo(point.x - 1, point.y);
          }
          context.lineTo(point.x, point.y);
          context.closePath();
          context.stroke();
        }
        
        
        
        
        
          for(var i=0; i < clickX.length; i++)
          {    
            context.beginPath();
            if(clickDrag[i] && i){
              context.moveTo(clickX[i-1], clickY[i-1]);
            }else{
               context.moveTo(clickX[i]-1, clickY[i]);
            }
             context.lineTo(clickX[i], clickY[i]);
             context.closePath();
             context.stroke();
          }
       
          
          
      }
      var clear = document.getElementById("btn_clear");
      var submit = document.getElementById("btn_submit");
          var i =0;
      clear.addEventListener("click", function() {
        canvas.width = canvas.width;
      });
      submit.addEventListener("click", function() {
        $("#file").attr("src", canvas.toDataURL("image/png"));
                /*imgData = canvas.toDataURL("image/png").replace("image/png",'image/octet-stream');
                var saveFile = function(data, filename) {
                    var save_link = document.createElementNS('a');
                    save_link.href = data;
                    save_link.download = filename;

                    var event = document.createEvent('MouseEvents');
                    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
                    save_link.dispatchEvent(event);
                }
                i=i+1;
                var filename = "测试签名" +i+ '.' + "png";
                saveFile(imgData,filename);*/
                $.ajax({
                    url: '/sign/uploadSign',
                    type: 'POST',
                    data: {img:canvas.toDataURL("image/png")},
                    success: function (data){
                        if(data=="yes"){
                            alert("上传图片成功")
                        }
                    },
                    error:function(data,status,e){
                        alert(e);
                    }
                });
      });
 
   }
catch(err)
   {
   txt="本页中存在错误。\n\n"
   txt+="错误描述:" + err.description + "\n\n"
   txt+="点击“确定”继续。\n\n"
   alert(txt)
   }

    </script>
      <img id="file" />
  </body>
</html>

4、实现签字功能演示

  • 启动springboot项目

  • 提交成功会显示提交成功

  • 服务器上可以看到图片已经保存好了

5、实现PDF的签字和加密

(1)PDF加密实现思路讲解(详细代码看工具类)

  • PDF加密的方法
    //加密
                EncryptPDFUtil.encryptPDF(outPath, "EncryptPDF");
  • 然后我们分装了两个权限,如果是需要对这个PDF文件修改一个密码,只能查看PDF一个密码
        //加密PDF文件
        PdfEncryptionKeySize keySize = PdfEncryptionKeySize.Key_128_Bit;
        String openPassword = "123456";//打开文档时,仅用于查看文档
        String permissionPassword = "test";//打开文档时,可编辑文档

(2)实现签字的方法的讲解

 signimg("src/main/resources/img/sign.png", srcPath, "批准人", outPath);
  • 其中第一个参数代表的是签字的图片,第二个参数源文件,第三个参数是“批准人”这个关键字的地方进行签字,第四个参数代表的是输出路径

(3)使用postman测试(因为是post接口,所有只能使用postman进行简单的测试)

(4)最终生成了两个文件

  • 一个是没有加密的signOut.pdf,他是签字后生成的文件

  • 加密后的文件EncryptPDF.pdf 这个需要输入密码才能打开文件

  • 输入只读密码 123456

  • 打开文件后,里面的所有文字不能复制

  • 使用可以修改权限打开文件 密码:test 文件是可以复制可以修改的

四、PDF实现生成水印并删除源文件

1、生成水印的工具类

package com.whj.util;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;
import com.itextpdf.text.pdf.*;

import java.io.File;
import java.io.FileOutputStream;

/**
 * @author 王恒杰
 * @date 2022/10/21 14:53
 * @Description:
 */
public class WaterMark {
    /**
     * pdf生成水印
     *
     * @param srcPdfPath       插入前的文件路径
     * @param tarPdfPath       插入后的文件路径
     * @param WaterMarkContent 水印文案
     * @param numberOfPage     每页需要插入的条数
     * @throws Exception
     */
    public static void addWaterMark(String srcPdfPath, String tarPdfPath, String WaterMarkContent, int numberOfPage) throws Exception {
        PdfReader reader = new PdfReader(srcPdfPath);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(tarPdfPath));
        PdfGState gs = new PdfGState();
        System.out.println("adksjskalfklsdk");
        //设置字体
        BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);

        // 设置透明度
        gs.setFillOpacity(0.4f);

        int total = reader.getNumberOfPages() + 1;
        PdfContentByte content;
        for (int i = 1; i < total; i++) {
            content = stamper.getOverContent(i);
            content.beginText();
            content.setGState(gs);
            //水印颜色
            content.setColorFill(BaseColor.DARK_GRAY);
            //水印字体样式和大小
            content.setFontAndSize(font, 35);
            //插入水印  循环每页插入的条数
            for (int j = 0; j < numberOfPage; j++) {
                content.showTextAligned(Element.ALIGN_CENTER, WaterMarkContent, 300, 200 * (j + 1), 30);
            }
            content.endText();
        }
        stamper.close();
        reader.close();
        boolean b = deleteFile(srcPdfPath);
        System.out.println("PDF水印添加完成!");
    }

    

}

删除源文件

   //删除没有用的文件
    public static boolean deleteFile(String path) {
        boolean result = false;
        File file = new File(path);
        if (file.isFile() && file.exists()) {
            int tryCount = 0;
            while (!result && tryCount++ < 10) {
                System.gc();
                result = file.delete();
            }
        }

        return result;
    }

2、测试

(1)加水印之前的源文件

(2)测试代码

public class TestWaterMark {
    public static void main(String[] args) {
        /**
         * pdf生成水印
         *
         * @param srcPdfPath       插入前的文件路径
         * @param tarPdfPath       插入后的文件路径
         * @param WaterMarkContent 水印文案
         * @param numberOfPage     每页需要插入的条数
         * @throws Exception
         */
        String srcPdfPath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\signOut.pdf";
        String tarPdfPath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\pdf\\TestWaterMark.pdf";
        String WaterMarkContent = "程序员小王";
        Integer numberOfPage = 3;
        try {
            WaterMark.addWaterMark(srcPdfPath, tarPdfPath, WaterMarkContent, numberOfPage);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

  • 删除源文件的代码
   boolean b = deleteFile(srcPdfPath);

(3)加水印之后的文件

五、PDF使用工具Adobe Acrobat DC+PDF+Itext模板实现二维码功能

1、打开电脑中的Adobe Acrobat pro DC(这个应该win10 都有,搜索一下就出来了),点击 文件→创建→创建表单

2、然后导入刚刚生成的pdf(注意签名后的文件不能再进行添加二维码或者文字了)

3、点击图片

4、固定好二维码固定位置然后编辑他为img()

  • 击这个阴影部分,将名称改成你要设置的名称,后面要根据这个名称来给他赋值

5、全部设置好以后就可以另存为了,打开后是这个样子

6、实现二维码生成的工具类(仅供测试,详细代码看7)

  • jar包
  <!-- 条形码、二维码生成 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.0</version>
        </dependency>
  • 代码
package com.whj.util.QR;


import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.Hashtable;

/**
 * @author 王恒杰
 * @date 2022/10/21 16:25
 * 二维码生成工具类
 *
 * 通过Google开源的zxing库来事项生成二维码图片
 */
public class QrCodeUtils {

    public static final String QR_CODE_IMAGE_PATH = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\QR\\MyQRCode.png";

    public static void generateQRCodeImage(String text, int width, int height, String filePath) throws WriterException, IOException {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();

        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);

        Path path = FileSystems.getDefault().getPath(filePath);

        MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);

    }

    /**
     * 生成二维码
     * @param contents 二维码的内容
     * @param width 二维码图片宽度
     * @param height 二维码图片高度
     */
    public static BufferedImage createQrCodeBufferdImage(String contents, int width, int height){
        Hashtable hints= new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BufferedImage image = null;
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(
                    contents,BarcodeFormat.QR_CODE, width, height, hints);
            image = toBufferedImage(bitMatrix);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return image;
    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }

    public static void main(String[] args) {
        try {
            generateQRCodeImage ("https://www.baidu.com/", 350, 350,QR_CODE_IMAGE_PATH);
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }




}

  • 测试二维码生成
package com.whj.util.QR;

import com.google.zxing.WriterException;

import java.io.IOException;

import static com.whj.util.QR.QrCodeUtils.QR_CODE_IMAGE_PATH;

/**
 * @author 王恒杰
 * @date 2022/10/24 15:42
 * @Description:
 */
public class TestQR {
    public static void main(String[] args) {
        try {
            /**
             * 第一个参数:内容可以是二维码 也可以是内容
             * 第二第三参数:二维码的宽高
             * 第四个参数:二维码生成后的地址
             */
            QrCodeUtils.generateQRCodeImage ("https://www.wolai.com/6MjBCdAq3mmGXBcb62V4DE", 350, 350,QR_CODE_IMAGE_PATH);
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}
  • 生成后的二维码

7、生成二维码之后将二维码嵌入进PDF综合版本

  • 生成二维码并且嵌入PDF工具
package com.whj;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.*;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author 王恒杰
 * @date 2022/10/24 16:06
 * @Description:
 */
public class QR {

    // 利用模板生成pdf

    public static void pdfout(Map<String,Object> map) {

        // 模板路径

        String templatePath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\QR\\QR.pdf";

        // 生成的新文件路径

        String newPDFPath = "D:\\Idea\\stamp\\Itext\\src\\main\\resources\\QR\\testout.pdf";

        PdfReader reader;

        FileOutputStream out;

        ByteArrayOutputStream bos;

        PdfStamper stamper;

        try {

            //给表单添加中文字体 这里采用系统字体。不设置的话,中文可能无法显示

            BaseFont bf = BaseFont.createFont("D:\\Idea\\stamp\\Itext\\src\\main\\resources\\Font\\SIMYOU.TTF" , BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

            Font FontChinese = new Font(bf, 5, Font.NORMAL);

            // 输出流

            out = new FileOutputStream(newPDFPath);

            // 读取pdf模板

            reader = new PdfReader(templatePath);

            bos = new ByteArrayOutputStream();

            stamper = new PdfStamper(reader, bos);

            AcroFields form = stamper.getAcroFields();




            Map<String,Object> qrcodeFields=(Map<String, Object>) map.get("qrcodeFields");

            //遍历二维码字段

            for (Map.Entry<String, Object> entry : qrcodeFields.entrySet()) {

                String key = entry.getKey();

                Object value = entry.getValue();

                // 获取属性的类型

                if(value != null && form.getField(key) != null){

                    //获取位置(左上右下)

                    AcroFields.FieldPosition fieldPosition = form.getFieldPositions(key).get(0);

                    //绘制二维码

                    float width = fieldPosition.position.getRight() - fieldPosition.position.getLeft();

                    BarcodeQRCode pdf417 = new BarcodeQRCode(value.toString(), (int)width, (int)width, null);

                    //生成二维码图像

                    Image image128 = pdf417.getImage();

                    //绘制在第一页

                    PdfContentByte cb = stamper.getOverContent(1);

                    //左边距(居中处理)

                    float marginLeft = (fieldPosition.position.getRight() - fieldPosition.position.getLeft() - image128.getWidth()) / 2;

                    //条码位置

                    image128.setAbsolutePosition(fieldPosition.position.getLeft() + marginLeft, fieldPosition.position.getBottom());

                    //加入条码

                    cb.addImage(image128);

                }

            }


            // 如果为false,生成的PDF文件可以编辑,如果为true,生成的PDF文件不可以编辑

            stamper.setFormFlattening(true);

            stamper.close();

            Document doc = new Document();

            Font font = new Font(bf, 20);

            PdfCopy copy = new PdfCopy(doc, out);

            doc.open();
            PdfImportedPage importPage = copy.getImportedPage(new PdfReader(bos.toByteArray()), 1);

            copy.addPage(importPage);

            doc.close();

        } catch (IOException e) {

            e.printStackTrace();

        } catch (DocumentException e) {

            e.printStackTrace();

        }

    }


}
  • 测试
 public static void main(String[] args) {

        //文本内容map

        Map<String,Object> map = new HashMap<String, Object>();

        //二维码map

        Map<String,Object> qrcodeFields = new HashMap<String, Object>();

        qrcodeFields.put("img","https://www.wolai.com/6MjBCdAq3mmGXBcb62V4DE");

        //组装map传过去

        Map<String,Object> o=new HashMap<String, Object>();

        o.put("qrcodeFields",qrcodeFields);
        //执行

        pdfout(o);

    }

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