电子签章（SpringCloud写一个简单签章）

java 代码实现电子签章（表格+签章）简单版本 注：使用的是springcloud项目

导入依赖 注：导入依赖不只有pdf的还有其他依赖

 <dependencies>
        <!--eureka 注册中心的客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--加入ribbon的配置-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>


        <dependency>
            <groupId>com.zhenzikj</groupId>
            <artifactId>zhenzisms</artifactId>
            <version>2.0.2</version>
        </dependency>


        <!--hystrix 依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>


        <!--加入openfegin依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>


        <!--监控程序依赖-->
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
            <version>2.2.4</version>
        </dependency>

        <!--加入配置中心的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!--springboot web程序-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>


        <!--mybatis-plus依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

        <!--mybatis-plus-generator 代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.5.1</version>
        </dependency>

        <!--mysql的驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.19</version>
        </dependency>

        <!--redis-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!--引入支付sdk-->
        <dependency>
            <groupId>com.alipay.sdk</groupId>
            <artifactId>alipay-sdk-java</artifactId>
            <version>4.31.72.ALL</version>
        </dependency>

        <!--xxl-job 分布式任务调度依赖-->
        <dependency>
            <groupId>com.xuxueli</groupId>
            <artifactId>xxl-job-core</artifactId>
            <version>2.3.0</version>
        </dependency>

        <!--alibaba easyexcel-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
        </dependency>

        <!--bootstrap 通过配置中心更改微服务配置-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
            <version>3.1.1</version>
        </dependency>

        <!--发送邮件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <!--kafka的配置-->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>

        <!-- 字体 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

        <!-- 设置pdf文件密码 -->
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.54</version>
        </dependency>
        <!-- pdf 转 图片 -->
        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.12</version>
        </dependency>
        <!-- pdf -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.13</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>


        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-image-generator</artifactId>
            <version>7.0.0.Beta2</version>
        </dependency>
        <!--svg转png-->
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-transcoder</artifactId>
            <version>1.13</version>
        </dependency>
        <dependency>
            <groupId>batik</groupId>
            <artifactId>batik-util</artifactId>
            <version>1.6-1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-codec</artifactId>
            <version>1.7</version>
        </dependency>



        <!--引入email-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>


        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-core</artifactId>
            <version>1.5.22</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>

            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.9</version>
        </dependency>
    </dependencies>

加入配置yml文件 注：application.yml没有pdf配置，配置直接写在controller类中

server:
  port: 80
#pdf:
#  enable: true
#  domain: http://localhost:${server.port}/
#  pdf-ks: D:\keystore\server.keystore
#  pdf-ks-pass: 123456
#  x: 400
#  y: 400
#  width: 200
#  height: 200
#  sign-pic-name: sign.png
#  path: D:\pic\
#  font: D:\fonts\simsun.ttc
spring:
  application:
    name: leavepdf
  datasource:
    url: jdbc:mysql://localhost:3306/xxx?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&nullCatalogMeansCurrent=true
    username: xxx
    password: xxx
    type: com.alibaba.druid.pool.DruidDataSource
//日志 注：类别info
logging:
  level:
    root: info

整体代码 注：别导错包

package com.bw.controller;

import java.io.*;
import java.net.URLEncoder;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.util.List;
import java.util.UUID;

import cn.hutool.core.util.IdUtil;
import com.bw.domain.Leave;
import com.bw.domain.User;
import com.bw.service.LeaveService;
import com.bw.service.UserService;
import com.itextpdf.kernel.font.PdfSimpleFont;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import com.itextpdf.text.pdf.security.BouncyCastleDigest;
import com.itextpdf.text.pdf.security.DigestAlgorithms;
import com.itextpdf.text.pdf.security.ExternalDigest;
import com.itextpdf.text.pdf.security.ExternalSignature;
import com.itextpdf.text.pdf.security.MakeSignature;
import com.itextpdf.text.pdf.security.MakeSignature.CryptoStandard;
import com.itextpdf.text.pdf.security.PrivateKeySignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.print.Doc;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import static com.bw.controller.Hello.*;

@RequestMapping("pdf")
@RestController
public class pdfController {
    public static final String KEYSTORE="ks/whj.p12";
    public static final char[] PASSWORD="123456".toCharArray();

    @Autowired
    UserService userService;

    @RequestMapping("pdflist")
    public String pdflist(HttpServletResponse response) throws DocumentException, GeneralSecurityException, IOException {
        List<User> list = userService.list();
        //生成唯一的文件名
        String filename = IdUtil.getSnowflakeNextIdStr()+".pdf";
        //必要响应代码，必须写
        response.setContentType("application/pdf");
        //加上这行代码就是下载，不加就是预览
//        response.addHeader("Content-Disposition","attachment;filename="+filename);
        //开启pdf
        Document document = new Document();
        PdfWriter instance = PdfWriter.getInstance(document, new FileOutputStream(filename));
        document.open();
        //更改pdf的字体问题，防止因为字体出现乱码
        //解决乱码问题
        BaseFont baseFont = null;
        baseFont=BaseFont.createFont("D:/fonts/SIMLI.TTF",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);
        Font font = new Font();
        font.setColor(BaseColor.BLUE);
        font.setSize(12);
        //开始进行pdf的表格的设置 注：参数为数据库有几个字段就写几
        PdfPTable pdfPTable = new PdfPTable(3);
        pdfPTable.addCell(new Paragraph("id",font));
        pdfPTable.addCell(new Paragraph("name",font));
        pdfPTable.addCell(new Paragraph("password",font));
        //循环列表将pdf存入
        for (User user:list){
            pdfPTable.addCell(new Paragraph(user.getId()+"",font));
            pdfPTable.addCell(new Paragraph(user.getName()+"",font));
            pdfPTable.addCell(new Paragraph(user.getPassword()+"",font));
        }
        document.add(pdfPTable);
        document.close();
        //https://kb.itextpdf.com/home/it5kb/examples/digital-signatures-chapter-2#Digitalsignatureschapter2-c2_07_signatureappearances
        //c2_07_signatureappearances第二段代码
        BouncyCastleProvider provider = new BouncyCastleProvider();
        Security.addProvider(provider);
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
        ks.load(new FileInputStream(KEYSTORE), PASSWORD);
        String alias = (String)ks.aliases().nextElement();
        PrivateKey pk = (PrivateKey) ks.getKey(alias, PASSWORD);
        Certificate[] chain = ks.getCertificateChain(alias);
        //需要更改的图片路径
        Image image = Image.getInstance("D:/pic/36693-111jpg/sign.png");
        //https://kb.itextpdf.com/home/it5kb/examples/digital-signatures-chapter-2#Digitalsignatureschapter2-c2_07_signatureappearances
        //c2_07_signatureappearances第一段代码
        //加入文件的名称
        PdfReader reader = new PdfReader(filename);
        //本行注释，文件的流在下面设置
//        FileOutputStream os = new FileOutputStream(dest);
        //输出流 通过响应创建一个
        ServletOutputStream outputStream = response.getOutputStream();
        PdfStamper stamper = PdfStamper.createSignature(reader,outputStream, '\0');
        PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
        //更改reason和location内容为String类型即可，可随意
        appearance.setReason("原因");
        appearance.setLocation("位置");
        //签章的位置，参数尽量固定
        appearance.setVisibleSignature(new Rectangle(400,100,100,780),1,"sig");
        //这行可以注释，没有作用
//        appearance.setLayer2Text("Signed on " + new Date().toString());
        //粘贴后加入的新数据（两行），尽量固定
        appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_FORM_FILLING_AND_ANNOTATIONS);
        appearance.setRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
        appearance.setSignatureGraphic(image);
        // Creating the signature下面一行无用注释
//        PrivateKeySignature pks = new PrivateKeySignature(pk, digestAlgorithm, provider);
        ExternalDigest digest =  new BouncyCastleDigest();
        //新加入的字段
        PrivateKeySignature signature = new PrivateKeySignature(pk, DigestAlgorithms.SHA256, provider.getName());
        //三个参数
        MakeSignature.signDetached(appearance, digest, signature, chain, null, null, null, 0, MakeSignature.CryptoStandard.CMS);
        outputStream.close();
        return "111111111";
    }


}