使用SpringBoot + Thymeleaf + iText实现动态PDF导出
1.前端模版代码，需要注意，iText有很多高级样式兼用性不好，需要自己试错：
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>模版文件</title>
<style>
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
li {
list-style: none;
}
@page {
size: A4;
margin: 0.5cm;
}
html, body {
width: 100%; /* A4宽度 */
font-family: SimSun, Arial, sans-serif;
}
/* 容器样式 */
.home, .profile, .clazzHourCert, .records {
width: 90%;
margin: 0 auto;
}
.records {
margin-top: 90px;
}
h1, h2 {
font-weight: normal;
}
.studyProfileNo {
text-align: right;
width: 100%;
margin-top: 70px;
}
.home h1 {
margin-top: 380px;
text-align: center;
width: 100%;
}
.info-container {
margin: 250px auto 0;
width: 100%;
position: relative;
}
.info-row {
margin-bottom: 35px;
text-align: left;
position: relative;
left: 35%;
}
.spacing {
/*调整汉字间距*/
letter-spacing: 2em;
font-style: normal;
}
table {
width: 100%;
/*设置框线*/
border-collapse: collapse;
/*固定列宽*/
table-layout: fixed;
}
.profile table {
text-align: center;
}
.profile table caption {
margin-bottom: 25px;
margin-top: 70px;
}
.profile table tr {
height: 25px;
}
td {
border: 1px solid black;
padding: 5px;
}
.clazzHourCert .title {
font-size: 20px;
text-align: center;
margin-top: 90px;
}
.clazzHourCert .no {
text-align: left;
margin-top: 60px;
}
.clazzHourCert table {
margin-top: 10px;
text-align: left;
}
.clazzHourCert td {
width: 40%;
height: 40px;
}
/*最后一行的表格*/
.clazzHourCert table tr:last-child {
height: 220px;
line-height: 2.5;
/*垂直底部对齐*/
vertical-align: bottom;
}
.studyRecords table, .faceRecords table {
/* 强制列宽固定 */
table-layout: fixed;
text-align: center;
}
/*span转成块才能设置宽高*/
.studyRecords .name {
display: inline-block;
width: 50%;
margin-bottom: 15px;
}
.exam header {
text-align: center;
}
.exam p {
margin-top: 15px;
}
.exam .info {
margin-top: 15px;
}
.exam td {
border: 0;
padding: 0;
text-align: left;
}
.home {
position: relative;
}
/*电子签章*/
.home .seal {
position: absolute;
bottom: -50px;
left: 120px;
}
.profile .seal {
position: relative;
left: 350px;
top: 250px;
}
.clazzHourCert .seal {
position: relative;
right: 100px;
top: 80px;
}
.faceRecords .seal {
position: absolute;
right: 150px;
bottom: 0;
}
.studyRecords {
position: relative;
}
.studyRecords .seal {
position: absolute;
left: 450px;
top: 750px;
}
.exam {
position: relative;
}
.exam .seal {
position: absolute;
left: 450px;
top: 750px;
}
</style>
</head>
<body>
<!--首页-->
<div class="home">
<p class="studyProfileNo">
档案编号：<span th:text="${data.studyProfileNo}"></span>
</p>
<h1>学员学习档案</h1>
<div class="info-container">
<div class="info-row">
<span class="label"><em class="spacing">姓</em>名：</span>
<span class="content" th:text="${data.studentName}"></span>
</div>
<div class="info-row">
<span class="label">身份证号：</span>
<span class="content" th:text="${data.idCard}"></span>
</div>
<div class="info-row">
<span class="label">生成日期：</span>
<span class="content" th:text="${data.curDate}"></span>
</div>
<div class="info-row">
平台名称（盖章）：
<img class="seal" src="" alt="电子签章" width="170"/>
</div>
</div>
</div>
<div style="page-break-before: always;"></div>
<!--学员学习档案-->
<div class="profile">
<table>
<caption><h2>学员学习档案</h2></caption>
<colgroup>
<col style="width: 20%;"/>
<col style="width: 20%;"/>
<col style="width: 10%;"/>
<col style="width: 10%;"/>
<col style="width: 10%;"/>
<col style="width: 10%;"/>
<col style="width: 20%;"/>
</colgroup>
<tbody>
<tr>
<td colspan="7">注册信息</td>
</tr>
<tr>
<td>姓名</td>
<td th:text="${data.studentName}"></td>
<td>性别</td>
<td th:text="${data.sex}"></td>
<td>年龄</td>
<td th:text="${data.age}"></td>
<td rowspan="5">
<img th:src="${data.personnelImg}" src="" alt="暂无图片" width="auto" height="125px"/>
</td>
</tr>
<tr>
<td>联系电话</td>
<td th:text="${data.phone}"></td>
<td colspan="2">身份证号</td>
<td colspan="2" style="font-size: 14px" th:text="${data.idCard}"></td>
</tr>
<tr>
<td>学历</td>
<td th:text="${data.education}"></td>
<td colspan="2">职务/职称</td>
<td colspan="2" th:text="${data.post}"></td>
</tr>
<tr>
<td>部门</td>
<td th:text="${data.department}"></td>
<td colspan="2">工种</td>
<td colspan="2" th:text="${data.craft}"></td>
</tr>
<tr>
<td>平台注册时间</td>
<td th:text="${data.registerTime}"></td>
<td colspan="2">累计课时</td>
<td colspan="2" th:text="${data.cumulativeClazzHour}"></td>
</tr>
<tr class="large-height" height="50px">
<td height="50px">所属单位</td>
<td colspan="6" height="50px" th:text="${data.companyName}"></td>
</tr>
<tr>
<td colspan="7">班级信息</td>
</tr>
<tr>
<td>班级名称</td>
<td colspan="6" th:text="${data.clazzName}"></td>
</tr>
<tr>
<td>班级编号</td>
<td colspan="2" th:text="${data.clazzNo}"></td>
<td colspan="2">班级期次</td>
<td colspan="2" th:text="${data.clazzIssue}"></td>
</tr>
<tr>
<td>班级期限</td>
<td colspan="2" th:text="${data.clazzDeadline}"></td>
<td colspan="2">起止学习时间</td>
<td colspan="2" th:text="${data.studyDeadline}"></td>
</tr>
<tr>
<td>学习方式</td>
<td colspan="2" th:text="${data.studyWay}"></td>
<td colspan="2">课程形式</td>
<td colspan="2" th:text="${data.courseForm}"></td>
</tr>
</tbody>
</table>
<img class="seal" src="" alt="电子签章" width="170"/>
</div>
<div style="page-break-before: always;"></div>
<!--学时证明-->
<div class="clazzHourCert">
<p class="title">安全教育职业培训平台学时证明</p>
<p class="no">证书编号： <span th:text="${data.clazzHourProve.clazzHourCertNo}"></span></p>
<table>
<tbody>
<tr>
<td>姓名</td>
<td><span th:text="${data.studentName}"></span></td>
</tr>
<tr>
<td>证件类型</td>
<td>身份证</td>
</tr>
<tr>
<td>证件编号</td>
<td><span th:text="${data.idCard}"></span></td>
</tr>
<tr>
<td>企业名称</td>
<td><span th:text="${data.companyName}"></span></td>
</tr>
<tr>
<td>班级名称</td>
<td><span th:text="${data.clazzName}"></span></td>
</tr>
<tr>
<td>培训日期</td>
<td><span th:text="${data.clazzHourProve.trainTime}"></span></td>
</tr>
<tr>
<td>培训类型</td>
<td><span th:text="${data.clazzHourProve.trainType}"></span></td>
</tr>
<tr>
<td>视频学习时长</td>
<td><span th:text="${data.clazzHourProve.videoLearningTime}"></span></td>
</tr>
<tr>
<td>合计在线学习时长</td>
<td><span th:text="${data.clazzHourProve.onlineLearningTotalTime}"></span></td>
</tr>
<tr>
<td>
培训单位：（盖章）<br/>
日期：<span th:text="${data.clazzHourProve.curDate}"></span>
</td>
<td>
平台：（盖章）<img class="seal" src="" alt="电子签章" width="170px"/><br/>
日期：<span th:text="${data.clazzHourProve.curDate}"></span>
</td>
</tr>
</tbody>
</table>
</div>
<div style="page-break-before: always;"></div>
<div class="records" th:each="item, stat : ${data.studyRecordsList}">
<!--人脸验证记录-->
<div class="faceRecords">
<table>
<colgroup>
<col style="width: 20%;"/>
<col style="width: 30%;"/>
<col style="width: 10%;"/>
<col style="width: 10%;"/>
<col style="width: 30%;"/>
</colgroup>
<tr>
<td colspan="5">学习记录</td>
</tr>
<tr>
<td>课程名称</td>
<td colspan="4" th:text="${item.studyRecords.courseName}"></td>
</tr>
<tr>
<td>要求课时</td>
<td th:text="${item.studyRecords.requireClazzHour}"></td>
<td colspan="2">已学课时</td>
<td th:text="${item.studyRecords.studyClazzHour}"></td>
</tr>
<tr>
<td>是否完成</td>
<td th:text="${item.studyRecords.completeStatus}"></td>
<td colspan="2">学时证明</td>
<td th:text="${item.studyRecords.clazzHourCertNo}"></td>
</tr>
<tr>
<td>到课率</td>
<td th:text="${item.studyRecords.clazzAttendance}"></td>
<td colspan="2">课程考试正确率</td>
<td th:text="${item.studyRecords.examCorrectAttendance}"></td>
</tr>
<tr>
<td>考试成绩</td>
<td th:text="${item.studyRecords.examScore}"></td>
<td colspan="2">是否合格</td>
<td th:text="${item.studyRecords.passStatus}"></td>
</tr>
<tr>
<td rowspan="6">人脸验证记录</td>
<td colspan="4">
共进行<span th:text="${item.studyRecords.faceVerifyTotal}"></span>次人脸认证，
成功<span th:text="${item.studyRecords.faceVerifySuccessCount}"></span>次，
失败<span th:text="${item.studyRecords.faceVerifyFailCount}"></span>次。
</td>
</tr>
<!--如果是第5行就增加相对定位，因为第五行第二列的签章设置相对定位了-->
<tr th:each="faceVerify, iterStat : ${item.studyRecords.faceVerifyList}" th:style="${iterStat.count == 5} ? 'position: relative;'">
<td colspan="2">
<span th:text="${faceVerify != null} ? '随机照片' + ${iterStat.count}"></span><br/>
<span th:text="${faceVerify != null} ? ${faceVerify.snapshotTime}"></span><br/>
<span th:text="${faceVerify != null} ? '课件：' + ${faceVerify.coursewareName}"></span>
</td>
<td colspan="2">
<!--如果是第5行就增加这个图片，不是的话不加-->
<img th:if="${iterStat.count == 5}" class="seal" src="" alt="电子签章" width="170px"/>
<img th:src="${faceVerify != null} ? ${faceVerify.snapshotFile}" src="" alt="暂无图片" width="auto" height="125px"/>
</td>
</tr>
<tr>
<td>考试试卷名称</td>
<td colspan="4" th:text="${item.studentExamPaper.examPaperName}"></td>
</tr>
</table>
</div>
<div style="page-break-before: always;"></div>
<!--课程章节学习记录-->
<div class="studyRecords">
<p>
<span class="name" th:text="'姓名：' + ${data.studentName}"></span>
<span class="idcardNo" th:text="'身份证号：' + ${data.idcard}"></span>
</p>
<table>
<!--每列的固定宽度-->
<colgroup>
<col style="width: 15%;"/>
<col style="width: 60%;"/>
<col style="width: 10%;"/>
<col style="width: 15%;"/>
</colgroup>
<tr>
<td>课程名称</td>
<td colspan="3" th:text="${item.courseCourseware.courseName}"></td>
</tr>
<tr>
<td>序号</td>
<td>课程内容</td>
<td>课时</td>
<td>讲师</td>
</tr>
<!--遍历课件列表-->
<tr th:each="courseware, iterStat : ${item.courseCourseware.coursewareList}">
<td th:text="${iterStat.count}"></td>
<td th:text="${courseware.coursewareName}"></td>
<td th:text="${courseware.courseHour}"></td>
<td th:text="${courseware.teacherName}"></td>
</tr>
</table>
<img class="seal" src="" alt="电子签章" width="170"/>
</div>
<!--PDF手动分页-->
<div style="page-break-before: always;"></div>
<!--试卷-->
<div class="exam">
<header>
<h1 th:text="${item.studentExamPaper.examPaperName}"></h1>
<p>（满分：<span th:text="${item.studentExamPaper.fullMark}"></span>分）</p>
<div class="info">
<table>
<colgroup>
<col style="width: 40%;"/>
<col style="width: 40%;"/>
<col style="width: 20%;"/>
</colgroup>
<tr>
<td>
班级名称：<span th:text="${data.clazzName}"></span>
</td>
<td>
姓名：<span th:text="${data.studentName}"></span>
</td>
<td>
成绩：<span th:text="${item.studentExamPaper.grade}"></span>
</td>
</tr>
<tr>
<td>
考试时间：<span th:text="${item.studentExamPaper.examTime}"></span>
</td>
<td>
判卷人：<span th:text="${item.studentExamPaper.judge}"></span>
</td>
</tr>
</table>
</div>
</header>
<main>
<section th:each="question, iterStat : ${item.studentExamPaper.examPaperItems}">
<p>
<span th:text="${question.questionContent}"></span>
</p>
<ul>
<li th:each="option : ${question.options}" th:text="${option}"></li>
</ul>
</section>
</main>
<img class="seal" src="" alt="电子签章" width="170"/>
</div>
<!-- 判断是否为最后一个元素，避免最后一项后多余分页 -->
<div th:if="${!stat.last}" style="page-break-after: always;"></div>
</div>
</body>
</html>
2.maven依赖
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>flying-saucer-pdf</artifactId>
<version>9.1.22</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13.3</version>
</dependency>
3.PDF工具类，将动态数据渲染到PDF模版中，并保存到磁盘
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.BaseFont;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class PDFUtil {
private static final TemplateEngine templateEngine;
static {
ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
templateResolver.setPrefix("template/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode(TemplateMode.HTML);
templateResolver.setCharacterEncoding("UTF-8");
templateResolver.setCacheable(true);
templateEngine = new TemplateEngine();
templateEngine.setTemplateResolver(templateResolver);
}
/**
* 获取PDF总页数
*/
public static int getPdfPageCount(String pdfPath) throws IOException {
PdfReader reader = new PdfReader(pdfPath);
int pages = reader.getNumberOfPages();
reader.close();
return pages;
}
/**
* 在 PDF 文档中插入骑缝章。
*
* @param inputPdfPath 输入的 PDF 文件路径
* @param outputPdfPath 输出的 PDF 文件路径
* @param sealImages 骑缝章图片数组（每个元素对应一页）
* @throws IOException 如果读取或写入文件时发生错误
* @throws DocumentException 如果操作 PDF 时发生错误
*/
public static void addRidingSeal(String inputPdfPath, String outputPdfPath, BufferedImage[] sealImages)
throws IOException, com.itextpdf.text.DocumentException {
// 读取输入的 PDF 文件
PdfReader reader = new PdfReader(inputPdfPath);
int numberOfPages = reader.getNumberOfPages();
// 确保骑缝章图片的数量与 PDF 页面数量一致
if (sealImages.length != numberOfPages) {
throw new IllegalArgumentException("骑缝章图片数量与 PDF 页面数量不匹配！");
}
// 创建输出的 PDF 文件
PdfStamper stamper = new PdfStamper(reader, Files.newOutputStream(Paths.get(outputPdfPath)));
// 循环每一页，将对应的骑缝章插入到页面中
for (int i = 1; i <= numberOfPages; i++) {
// 获取当前页的内容字节流
PdfContentByte content = stamper.getOverContent(i);
// 将 BufferedImage 转换为 iText 的 Image 对象
File tempFile = File.createTempFile("sealPart", ".png");
ImageIO.write(sealImages[i - 1], "png", tempFile);
Image sealImage = Image.getInstance(tempFile.getAbsolutePath());
float scaleDownFactor = 0.72f;// 电子签章缩放倍数
// 获取原始 BufferedImage 的宽高（以像素为单位）
float originalWidthPx = sealImages[i - 1].getWidth() * scaleDownFactor;
float originalHeightPx = sealImages[i - 1].getHeight() * scaleDownFactor;
// 设置骑缝章的实际宽高（保持比例不变）
sealImage.scaleAbsolute(originalWidthPx, originalHeightPx);
// 设置骑缝章的位置
Rectangle pageSize = reader.getPageSize(i);
float pageWidth = pageSize.getWidth();
float pageHeight = pageSize.getHeight();
// 计算骑缝章的位置（右侧边缘，垂直居中）
float x = pageWidth - sealImage.getScaledWidth(); // 右侧边缘
float y = (pageHeight - sealImage.getScaledHeight()) / 2; // 垂直居中
// 添加骑缝章到当前页
sealImage.setAbsolutePosition(x, y);
content.addImage(sealImage);
// 删除临时文件
tempFile.deleteOnExit();
}
// 关闭资源
stamper.close();
reader.close();
}
/**
* 将HTML转换为PDF
* @param htmlContent HTML内容
* @param outputPath 输出路径
* @param fileName 文件名称
* @throws IOException
* @throws DocumentException
*/
public static void convertHtmlToPdf(String htmlContent, String outputPath, String fileName)
throws IOException, DocumentException {
ITextRenderer renderer = new ITextRenderer();
// 加载中文字体
try (InputStream fontStream = PDFUtil.class.getClassLoader().getResourceAsStream("fonts/simsun.ttc")) {
if (fontStream == null) {
throw new IOException("无法找到字体文件");
}
Path tempFontFile = Files.createTempFile("simsun", ".ttc");
tempFontFile.toFile().deleteOnExit();
Files.copy(fontStream, tempFontFile, StandardCopyOption.REPLACE_EXISTING);
renderer.getFontResolver().addFont(tempFontFile.toString(), BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
}
renderer.setDocumentFromString(htmlContent);
renderer.layout();
try (OutputStream os = Files.newOutputStream(Paths.get(outputPath + fileName))) {
renderer.createPDF(os);
}
}
public static String processTemplateWithData(Object dataModel, String templateName) throws IOException {
Context context = new Context();
context.setVariable("data", dataModel); // 将数据模型设置到Thymeleaf上下文中
return templateEngine.process(templateName, context);
}
}
测试调用：
try {
// 使用数据对象处理HTML模板，模版放到resources/template文件夹中，且必须是HTML文件
String processedHtml = PDFUtil.processTemplateWithData(studentProfile, "study_profile");
// 转换为PDF
PDFUtil.convertHtmlToPdf(processedHtml, "/path/to/save/", "newfile.pdf");
System.out.println("PDF生成成功！");
} catch (Exception e) {
e.printStackTrace();
}
4.图片处理工具类，用于处理骑缝章
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class ImageUtil {
/**
* 调整图片大小以达到目标宽度，并保持宽高比。
*
* @param inputFile 输入图片文件路径
* @param outputFile 输出调整大小后的图片文件路径
* @param targetWidth 目标宽度
* @throws IOException 如果读取或写入图片时发生错误
*/
public static void resizeImage(String inputFile, String outputFile, int targetWidth) throws IOException {
// 读取原始图片
BufferedImage originalImage = ImageIO.read(new File(inputFile));
if (originalImage == null) {
throw new IOException("无法读取图片文件: " + inputFile);
}
// 获取原始尺寸
int originalWidth = originalImage.getWidth();
int originalHeight = originalImage.getHeight();
// 计算新的高度，保持原始宽高比
int targetHeight = (int) (targetWidth * ((double) originalHeight / originalWidth));
// 创建一个新的空白图像，用于绘制调整大小后的图像
BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, originalImage.getType());
Graphics2D g2d = resizedImage.createGraphics();
// 使用抗锯齿和高质量的缩放算法绘制调整大小后的图像
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.drawImage(originalImage, 0, 0, targetWidth, targetHeight, null);
// 释放资源
g2d.dispose();
// 写入输出文件
String formatName = inputFile.substring(inputFile.lastIndexOf(".") + 1);
ImageIO.write(resizedImage, formatName, new File(outputFile));
}
/**
* 图片分割
* @param imagePath 图片路径
* @param parts 切割数量
* @return 切割后的图片数组
* @throws Exception
*/
public static BufferedImage[] splitImage2(String imagePath, int parts) throws Exception {
// 加载图片
BufferedImage originalImage = ImageIO.read(new File(imagePath));
int totalWidth = originalImage.getWidth();
int height = originalImage.getHeight();
System.out.println(totalWidth + " : " + height);
// 创建分割后的图片数组
BufferedImage[] splitImages = new BufferedImage[parts];
// 计算每段的基础宽度和剩余宽度
int basePartWidth = totalWidth / parts; // 每段的基础宽度
int remainder = totalWidth % parts; // 剩余的宽度
for (int i = 0; i < parts; i++) {
// 动态计算当前段的宽度
int partWidth = basePartWidth + (i < remainder ? 1 : 0);
// 计算当前段的起始位置
int startX = i * basePartWidth + Math.min(i, remainder);
// 截取当前段
splitImages[i] = originalImage.getSubimage(startX, 0, partWidth, height);
}
return splitImages;
}
}
5.向PDF中插入骑缝章
String inputPdf = "/path/to/input/file.pdf";
String outputPdf = "/path/to/out/newfile.pdf";
String sealImage = "/path/to/seal/seal.png";
int parts = PDFUtil.getPdfPageCount(inputPdf);
BufferedImage[] bufferedImages = ImageUtil.splitImage(sealImage, parts);
PDFUtil.addRidingSeal(inputPdf, outputPdf, bufferedImages);
6.效果展示
不知道为什么，PDF插入骑缝章的时候，即便是给骑缝章设置了固定宽高，到PDF后依然会失调，所以手动设置了宽高的缩放比为0.72。至此，使用SpringBoot + Thymeleaf + iText实现动态PDF导出完成。
服务器部署后发现在插入骑缝章的时候，JVM崩溃，内存方面的，怀疑是iText的bug或者其他情况，骑缝章这块改成Apache的PDFBox了，然后正常，大体逻辑不变。
<!-- PDFBox 核心库 -->
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.27</version>
</dependency>
<!-- PDFBox 工具库（包含图像处理等实用功能） -->
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox-tools</artifactId>
<version>2.0.27</version>
</dependency>
PDFUtil工具类
public static void addRidingSeal2(String inputPdfPath, String outputPdfPath, BufferedImage[] sealImages)
throws IOException {
// 参数校验
if (inputPdfPath == null || outputPdfPath == null || sealImages == null) {
throw new IllegalArgumentException("输入参数不能为null");
}
try (PDDocument document = PDDocument.load(new File(inputPdfPath))) {
// 1. 读取PDF
int numberOfPages = document.getNumberOfPages();
// 2. 验证骑缝章数量
if (sealImages.length != numberOfPages) {
throw new IllegalArgumentException(
String.format("骑缝章图片数量(%d)与PDF页面数量(%d)不匹配",
sealImages.length, numberOfPages)
);
}
// 3. 处理每一页
for (int i = 0; i < numberOfPages; i++) {
BufferedImage sealImg = sealImages[i];
PDPage page = document.getPage(i);
// 3.1 校验图像有效性
if (sealImg == null || sealImg.getWidth() <= 0 || sealImg.getHeight() <= 0) {
throw new IllegalArgumentException(
String.format("第%d页的骑缝章图像无效", i + 1)
);
}
// 3.2 将图像转为PDFBox的PDImageXObject
PDImageXObject pdImage;
try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
ImageIO.write(sealImg, "png", baos);
pdImage = PDImageXObject.createFromByteArray(document, baos.toByteArray(), "seal");
}
// 3.3 设置图像大小和位置
float scale = 0.72f;
float width = sealImg.getWidth() * scale;
float height = sealImg.getHeight() * scale;
float x = page.getMediaBox().getWidth() - width; // 右侧
float y = (page.getMediaBox().getHeight() - height) / 2; // 垂直居中
// 3.4 添加到PDF
try (PDPageContentStream contentStream = new PDPageContentStream(
document, page, PDPageContentStream.AppendMode.APPEND, true)) {
contentStream.drawImage(pdImage, x, y, width, height);
}
}
// 4. 保存PDF
document.save(outputPdfPath);
}
}