书接上文，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");
    }

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作者：huanzi-qch

出处：https://www.cnblogs.com/huanzi-qch

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