前言
我们之前使用js库html2canvas + jspdf实现html转PDF、图片，并下载（详情请戳：html页面转PDF、图片操作记录），大致原理是将页面塞到画布里，以图片的方式放到PDF中，生成的文件比较大，文本记录Java使用iText7生成PDF
iText 7是iText强大的PDF工具包的最新版本，用于PDF生成，PDF编程，处理和操作，如数字签名等
官方文档：https://kb.itextpdf.com/home/it7kb/ebooks
简单生成PDF
官方文档：https://kb.itextpdf.com/home/it7kb/ebooks/itext-7-jump-start-tutorial-for-java
根据文档说明，我们引入依赖
<properties> <!-- 省略其他部分...--> <itext7.version>7.1.7</itext7.version> </properties> <dependencies> <!-- 省略其他部分...--> <!-- itextpdf --> <dependency> <groupId>com.itextpdf</groupId> <artifactId>kernel</artifactId> <version>${itext7.version}</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>io</artifactId> <version>${itext7.version}</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>layout</artifactId> <version>${itext7.version}</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>forms</artifactId> <version>${itext7.version}</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>pdfa</artifactId> <version>${itext7.version}</version> </dependency> </dependencies>
代码
package cn.huanzi.qch.util; import com.itextpdf.html2pdf.ConverterProperties; import com.itextpdf.html2pdf.HtmlConverter; import com.itextpdf.io.font.PdfEncodings; import com.itextpdf.io.image.ImageDataFactory; import com.itextpdf.kernel.colors.Color; import com.itextpdf.kernel.colors.DeviceRgb; import com.itextpdf.kernel.events.Event; import com.itextpdf.kernel.events.IEventHandler; import com.itextpdf.kernel.events.PdfDocumentEvent; import com.itextpdf.kernel.font.PdfFont; import com.itextpdf.kernel.font.PdfFontFactory; import com.itextpdf.kernel.geom.PageSize; import com.itextpdf.kernel.geom.Rectangle; import com.itextpdf.kernel.pdf.PdfDocument; import com.itextpdf.kernel.pdf.PdfPage; import com.itextpdf.kernel.pdf.PdfWriter; import com.itextpdf.kernel.pdf.action.PdfAction; import com.itextpdf.kernel.pdf.annot.PdfLinkAnnotation; import com.itextpdf.kernel.pdf.canvas.PdfCanvas; import com.itextpdf.layout.Canvas; import com.itextpdf.layout.Document; import com.itextpdf.layout.Style; import com.itextpdf.layout.element.*; import com.itextpdf.layout.font.FontProvider; import com.itextpdf.layout.property.TextAlignment; import com.itextpdf.layout.property.VerticalAlignment; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; /** * itextpdf 工具类 * iText 7是iText强大的PDF工具包的最新版本，用于PDF生成，PDF编程，处理和操作，如数字签名等。 * https://kb.itextpdf.com/home/it7kb/ebooks */ public class ITextPdfUtil { //字体，我这里使用系统自带的simhei黑体 private static final String FONT = "C:/Windows/Fonts/simhei.ttf"; //html转pdf public static void html2pdf(){ String html = ""; //从html文件读取内容 StringBuilder stringBuilder = new StringBuilder(); try (BufferedReader reader = new BufferedReader(new FileReader("E:\\Java\\html2pdf.html"));){ for (Object o : reader.lines().toArray()) { stringBuilder.append(o); } }catch (Exception e){ e.printStackTrace(); } html = stringBuilder.toString(); try (PdfWriter writer = new PdfWriter("E:\\Java\\html2pdf.pdf"); PdfDocument pdf = new PdfDocument(writer); ){ //转换器属性设置 ConverterProperties props = new ConverterProperties(); //字体 props.setFontProvider(new FontProvider()); props.getFontProvider().addFont(ITextPdfUtil.FONT); //为img图片配置基础路径 props.setBaseUri("D:\\XFT User\\Pictures\\"); //HtmlConverter.convertToDocument Document document = HtmlConverter.convertToDocument(html, pdf, props); //设置文档属性 pdf.getDocumentInfo().setAuthor("huanzi-qch"); pdf.getDocumentInfo().setTitle("IText测试html2pdf"); pdf.getDocumentInfo().setSubject("XXX公司"); pdf.getDocumentInfo().setMoreInfo("1","111"); pdf.getDocumentInfo().setCreator("huanzi"); pdf.getDocumentInfo().setKeywords("IText"); //注册事件监听 pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler()); //设置字体 document.setFont(ITextPdfUtil.getPdfFont()); //页边距 document.setMargins(0, 0, 0, 0); document.close(); System.out.println("操作完成！"); }catch (IOException e){ e.printStackTrace(); System.err.println("操作异常..."); } } //生成简单PDF public static void test(){ //语法糖 try (PdfWriter writer = new PdfWriter("E:\\Java\\test.pdf"); PdfDocument pdf = new PdfDocument(writer); Document document = new Document(pdf, PageSize.A4.rotate()); ){ //设置文档属性 pdf.getDocumentInfo().setAuthor("huanzi-qch"); pdf.getDocumentInfo().setTitle("IText测试PDF"); pdf.getDocumentInfo().setSubject("XXX公司"); pdf.getDocumentInfo().setMoreInfo("1","111"); pdf.getDocumentInfo().setCreator("huanzi"); pdf.getDocumentInfo().setKeywords("IText"); //注册事件监听 pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler()); //设置字体 document.setFont(ITextPdfUtil.getPdfFont()); //页边距 document.setMargins(20, 20, 20, 20); //简单文字 document.add(new Paragraph("简单文字")); document.add(new Paragraph("Hello Word!").add(new Tab()).add(new Text("你好！").addStyle(new Style().setFontSize(24)))); //简单图片 document.add(new Paragraph("简单图片")); document.add(new Image(ImageDataFactory.create("D:\\XFT User\\Pictures\\logo.png"))); //简单表格 document.add(new Paragraph("简单表格")); Table table = new Table(new float[]{3, 3, 4}); PdfFont font = ITextPdfUtil.getPdfFont(); //标题、内容 process(table, "姓名;年龄;电话号码", font, true); for (int i = 0; i < 5; i++) { process(table, "张三"+i+";"+(18+i)+";1500000000"+i, font, false); } document.add(table); //超链接 document.add(new Paragraph("超链接")); PdfLinkAnnotation annotation = new PdfLinkAnnotation(new Rectangle(0, 0)); annotation.setAction(PdfAction.createURI("https://itextpdf.com/")); Paragraph p = new Paragraph("更多精彩内容，猛戳：").add(new Link("这里", annotation)); document.add(p); //换一页 //document.add(new AreaBreak(AreaBreakType.NEXT_PAGE)); document.close(); System.out.println("操作完成！"); } catch (IOException e) { e.printStackTrace(); System.err.println("操作异常..."); } } //获取统一字体 public static PdfFont getPdfFont(){ PdfFont pdfFont = null; try { pdfFont = PdfFontFactory.createFont(ITextPdfUtil.FONT, PdfEncodings.IDENTITY_H,true); } catch (IOException e) { e.printStackTrace(); } return pdfFont; } //设置表格内容 public static void process(Table table, String line, PdfFont font, boolean isHeader) { String[] split = line.split(";"); for (String s : split) { Cell cell = new Cell().add(new Paragraph(s).setFont(font)); if (isHeader) { table.addHeaderCell(cell); } else { table.addCell(cell); } } } /** * 自定义事件监听 * * 背景颜色 * 页脚页眉 * 文字水印 * * 也可以分成多个EventHandler */ protected static class MyEventHandler implements IEventHandler { @Override public void handleEvent(Event event) { PdfDocumentEvent docEvent = (PdfDocumentEvent) event; PdfDocument pdfDoc = docEvent.getDocument(); PdfPage page = docEvent.getPage(); int pageNumber = pdfDoc.getPageNumber(page); Rectangle pageSize = page.getPageSize(); PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc); //背景颜色 Color backgroundColor = new DeviceRgb(245, 245, 245);; pdfCanvas.saveState() .setFillColor(backgroundColor) .rectangle(pageSize.getLeft(), pageSize.getBottom(),pageSize.getWidth(), pageSize.getHeight()) .fill().restoreState(); //页脚页眉 PdfFont pdfFont = ITextPdfUtil.getPdfFont(); String header = "我是页眉"; String footer = "第 "+pageNumber+" 页"; pdfCanvas.beginText() .setFontAndSize(pdfFont, 9) .moveText((pageSize.getWidth() / 2) - (pdfFont.getWidth(header) / 200), pageSize.getTop() - 20) .showText(header) .moveText((pdfFont.getWidth(header) / 200) - (pdfFont.getWidth(footer) / 200), -pageSize.getTop() + 30) .showText(footer) .endText(); //文字水印 Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize()); canvas.setFontColor(new DeviceRgb(200, 200, 200)); canvas.setProperty(20, 20); canvas.setFont(pdfFont); for (int i = 0; i < 5; i++) { for (int j = 0; j < 5; j++) { canvas.showTextAligned(new Paragraph("我是文字水印").setOpacity(0.8f),(150 + i * 300), (160 + j * 150), pdfDoc.getPageNumber(page), TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45); } } pdfCanvas.release(); } } //测试 public static void main(String[] args) { test(); //html2pdf(); } }
效果
生成的PDF
文档属性
HTML转PDF
官方文档：https://kb.itextpdf.com/home/it7kb/ebooks/itext-7-converting-html-to-pdf-with-pdfhtml
pdfHTML是iText 7的一个附加组件，需要添加依赖
<properties> <!-- 省略其他部分...--> <itext7.html2pdf.version>2.1.4</itext7.html2pdf.version> </properties> <dependencies> <!-- 省略其他部分...--> <!-- itextpdf html2pdf组件--> <dependency> <groupId>com.itextpdf</groupId> <artifactId>html2pdf</artifactId> <version>${itext7.html2pdf.version}</version> </dependency> </dependencies>
代码
代码同上，仅main测试函数不同！
//测试 public static void main(String[] args) { //test(); html2pdf(); }
PS：html内容往下拉
效果
html页面
<!DOCTYPE html> <html> <head> <title>简单简历</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="cache-control" content="no-cache, no-store, must-revalidate"/> <meta http-equiv="pragma" content="no-cache"/> <meta http-equiv="expires" content="0"/> <!-- 自定义样式 --> <style> *{ font-family: "Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,sans-serif; } body { margin: 0; padding: 0; } a { text-decoration: none; padding: 0; margin: 5px 0; color: black; } a:hover { color: #5c8dff; } b{ margin: 0 10px; } /* 主体 */ .main { /*margin: 0 auto;*/ /*width: 770px;*/ /*box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);*/ /*border: 1px solid #dad8d8;*/ /*background: #fbfbfb;*/ } /* 1级标题 */ h3.list1 { color: #409EFF; border-bottom: 1px solid #409EFF; padding: 5px; margin: 50px 0 0 0; } /* 大模块 */ .block,.block1 { /*background: #efefef;*/ /*border: 1px solid #dad8d8;*/ margin: 0 0 20px 0; padding: 0 10px; } .block,.block1 p { text-indent:2em; } .block:hover { background: #eeeeee; } .block1:hover { background: #cecece; } .button-list{ text-align: center; margin: 20px auto; padding: 10px; width: 1024px; } </style> </head> <body> <!-- 简历主体 --> <div id="body" class="main"> <div class="section"> <div class="module"> <h3 class="list1" style="margin: 0;">基本信息</h3> <div class="block"> <p>XXX<b>/</b>男<b>/</b>25岁</p> <p>本科<b>/</b>XX学校<b>/</b>XX专业<b>/</b>2014-2018</p> <p>工龄：X年</p> <p>手机：XXXXXXXXXX</p> <p>邮箱：XXXXX@qq.com</p> <p>GitHub：<a href="https://github.com/huanzi-qch">https://github.com/huanzi-qch</a></p> <p>博客园：<a href="https://www.cnblogs.com/huanzi-qch">https://www.cnblogs.com/huanzi-qch</a></p> <br/> <p>求职岗位：Java开发<b>/</b>目标城市：南宁市<b>/</b>期望薪资：面议</p> <p>注：已离职，一个月可到岗</p> <img style="position: relative;top: -350px;left: 500px;width: 100px;height: 130px;" src="logo.png"/> </div> </div> <div class="module"> <h3 class="list1">技能清单</h3> <div class="block"> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> <p>熟悉XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX。</p> </div> </div> <div class="module"> <h3 class="list1">工作经历</h3> <div class="block"> <p>XXX技术有限公司<b>/</b>Java开发工程师<b>/</b>2018.01 - 至今</p> <p>参与多个项目开发、测试、部署等工作，包括：</p> <p>1、XXX。</p> <p>2、XXX。</p> <p>3、XXX。</p> </div> </div> <div class="module"> <h3 class="list1">项目经历</h3> <div class="block"> <h4 class="list2">项目1</h4> <div class="block1"> <p>项目名称：XXX（2020-11 —2021-11）</p> <p>项目介绍：XXXXXXXXXXXXXXX。</p> <p>技术架构：XXX + XXX + XXX。</p> <p>职责描述：</p> <p>1、XXXX。</p> <p>2、XXXX。</p> <p>3、XXXX。</p> <p>4、XXXX。</p> </div> <h4 class="list2">项目2</h4> <div class="block1"> <p>项目名称：XXX（2020-11 —2021-11）</p> <p>项目介绍：XXXXXXXXXXXXXXX。</p> <p>技术架构：SpringBoot + Vue + Element-UI + ECharts。</p> <p>职责描述：</p> <p>1、XXXX。</p> <p>2、XXXX。</p> <p>3、XXXX。</p> <p>4、XXXX。</p> </div> </div> </div> <div class="module"> <h3 class="list1">自我评价</h3> <div class="block"> <p>1、XXXX；</p> <p>2、XXXX；</p> <p>3、XXXX；</p> </div> </div> </div> </div> </body> </html>
生成的PDF
电子签章
2021-11-23更新
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"); }
后记
不管是前端生成PDF，还是后端生成PDF，能实现需求就是好技术！
