本文记录iText7实现PDF电子签章

　　提前准备

　　1、keystore文件，生成自签名证书，猛戳：SpringBoot系列——启用https

打开cmd，执行以下命令  keytool -genkeypair -alias stamper -keypass 123456 -keyalg RSA -keysize 1024 -validity 365 -keystore e:/Java/stamper.keystore -storepass 123456

　　2、印章图片，这里有个在线制作电子公章小工具：http://makepic.net/tool/signet.html

　　3、pom需要引入新依赖包

        <!-- 条形码、电子签章 -->         <dependency>             <groupId>com.itextpdf</groupId>             <artifactId>barcodes</artifactId>             <version>${itext7.version}</version>         </dependency>         <dependency>             <groupId>com.itextpdf</groupId>             <artifactId>hyph</artifactId>             <version>${itext7.version}</version>         </dependency>         <dependency>             <groupId>com.itextpdf</groupId>             <artifactId>font-asian</artifactId>             <version>${itext7.version}</version>         </dependency>         <dependency>             <groupId>com.itextpdf</groupId>             <artifactId>sign</artifactId>             <version>${itext7.version}</version>         </dependency>         <!-- 加密软件包 -->         <dependency>             <groupId>org.bouncycastle</groupId>             <artifactId>bcprov-jdk15on</artifactId>             <version>1.69</version>         </dependency>         <dependency>             <groupId>org.bouncycastle</groupId>             <artifactId>bcpkix-jdk15on</artifactId>             <version>1.69</version>         </dependency>

　　代码

    /**      * 电子签章      * @param src 需要签章的pdf文件路径      * @param dest 签完章的pdf文件路径      */     public static void sign(String src, String dest)  {         final String KEYSTORE = "E:\\Java\\stamper.keystore";//keystore文件路径         final char[] PASSWORD = "123456".toCharArray();// keystore密码         final String STAMPER_SRC = "E:\\Java\\stamper.gif";//印章图片路径          try (PdfReader reader = new PdfReader(src); FileOutputStream os = new FileOutputStream(dest);){             //读取keystore ，获得私钥和证书链 jks             KeyStore ks = KeyStore.getInstance("JKS");             ks.load(new FileInputStream(KEYSTORE), PASSWORD);             String alias = ks.aliases().nextElement();             PrivateKey pk = (PrivateKey) ks.getKey(alias, PASSWORD);             Certificate[] chain = ks.getCertificateChain(alias);              //创建签章工具PdfSigner、设定数字签章的属性             PdfSigner stamper = new PdfSigner(reader, os, new StampingProperties());             PdfSignatureAppearance appearance = stamper.getSignatureAppearance();             appearance.setReason("签名原因：系统自动签名盖章");             appearance.setLocation("签名地点：xxx系统");             appearance.setContact("联系方式：huanzi.qch@qq.com");              //加盖图章图片             ImageData img = ImageDataFactory.create(STAMPER_SRC);             Image image = new Image(img);             appearance.setPageNumber(1);             appearance.setPageRect(new Rectangle(650, 50, image.getImageWidth(), image.getImageHeight()));             appearance.setSignatureGraphic(img);             appearance.setRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);              //No such provider: BC : 问题解决，加BC库支持             Security.addProvider(new BouncyCastleProvider());              //摘要算法             IExternalDigest digest = new BouncyCastleDigest();             //签名算法             IExternalSignature signature = new PrivateKeySignature(pk, DigestAlgorithms.SHA256, BouncyCastleProvider.PROVIDER_NAME);              //调用itext签名方法完成pdf签章             stamper.setCertificationLevel(1);             stamper.signDetached(digest,signature, chain, null, null, null, 0, PdfSigner.CryptoStandard.CMS);              System.out.println("操作完成！");         }catch (Exception e){             e.printStackTrace();             System.err.println("操作异常...");         }     }

　　效果

　　我们用 test() 生成的简单PDF文件来进行电子签章测试

    //测试     public static void main(String[] args) {         //test();          //html2pdf();          sign("E:\\Java\\test.pdf","E:\\Java\\test2.pdf");     }