首先定义一个HTML模板，通过后台数据填充，生成PDF文件。
目录
一、所需依赖
二、生成工具类
三、准备模板
四、字体和模板放置的位置
五、生成PDF文件预览
一、所需依赖
<!-- pdf所需依赖模块begin--><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.11</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.1.1</version></dependency><dependency><groupId>com.itextpdf.tool</groupId><artifactId>xmlworker</artifactId><version>5.5.11</version></dependency><dependency><groupId>org.freemarker</groupId><artifactId>freemarker</artifactId><version>2.3.19</version></dependency><dependency><groupId>org.xhtmlrenderer</groupId><artifactId>flying-saucer-pdf</artifactId><version>9.1.5</version></dependency><!-- /artifact/org.xhtmlrenderer/flying-saucer-pdf-itext5 --><dependency><groupId>org.xhtmlrenderer</groupId><artifactId>flying-saucer-pdf-itext5</artifactId><version>9.1.5</version></dependency><!-- pdf所需依赖模块end--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.16</version></dependency>
二、生成工具类
package com.ruoyi.print_system.util;import cn.hutool.core.io.resource.ResourceUtil;import com.itextpdf.text.pdf.BaseFont;import freemarker.template.Configuration;import freemarker.template.Template;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.xhtmlrenderer.pdf.ITextFontResolver;import org.xhtmlrenderer.pdf.ITextRenderer;import java.io.*;import java.util.Map;public class JavaToPdfUtil {private static Logger logger = LoggerFactory.getLogger(JavaToPdfUtil.class);//模板文件private static final String HTML = "template/pdf-template.html";//仿宋字体private static final String FONT_TTF = "fonts/FangSong.ttf";private static Configuration freemarkerCfg = null;static {freemarkerCfg = new Configuration();//freemarker的模板目录try {freemarkerCfg.setDirectoryForTemplateLoading(new File(ResourceUtil.getResource("").getPath()));} catch (IOException e) {e.printStackTrace();}}/*** 创建PDF文件** @param data数据加载* @param filename 文件名称* @return*/public static boolean createPdfFile(Map<String, Object> data, String filename) {try {String content = JavaToPdfUtil.freeMarkerRender(data, HTML);JavaToPdfUtil.createPdf(content, filename);logger.info("PDF生成成功");} catch (Exception e) {logger.error("PDF生成失败:{}", e.getMessage());return false;}return true;}/*** freemarker渲染html*/public static String freeMarkerRender(Map<String, Object> data, String htmlTmp) {Writer out = new StringWriter();try {// 获取模板,并设置编码方式Template template = freemarkerCfg.getTemplate(htmlTmp);template.setEncoding("UTF-8");// 合并数据模型与模板template.process(data, out); //将合并后的数据和模板写入到流中，这里使用的字符流out.flush();return out.toString();} catch (Exception e) {e.printStackTrace();} finally {try {out.close();} catch (IOException ex) {ex.printStackTrace();}}return null;}/*** html生成PDF文件** @param content 渲染后的html字符串* @param dest PDF生成路径地址* @throws Exception*/public static void createPdf(String content, String dest) throws Exception {ITextRenderer render = new ITextRenderer();ITextFontResolver fontResolver = render.getFontResolver();// 解决itext生成中文不显示问题String FONT_TTF_PATH = ResourceUtil.getResource("").getPath().replace("target/classes/", "").concat("src/main/resources/") + FONT_TTF;fontResolver.addFont(FONT_TTF_PATH, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);// 解析html生成pdfrender.setDocumentFromString(content);//解决图片相对路径的问题render.getSharedContext().setBaseURL(null);render.layout();render.createPDF(new FileOutputStream(dest));}}
三、准备模板
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><title>Document</title><style><!-- A4纸张横向显示 -->@page {size: 297mm 210mm;}body {/*中文字体*/font-family: FangSong;}#main {font-size: 20px;width: 843px;height: 596px;margin-left: 20px;}#photo {width: 95px;height: 130px;position: absolute;left: 532px;top: 100px;}#left {width: 330px;height: 270px;position: relative;left: 0px;top: 160px;text-align: left;padding: 5px;}#left>p {text-indent: 2em;}#left p:nth-child(1) {line-height: 30px;}#left p:nth-child(2) {line-height: 20px;font-size: 16px;/*英文字体*/font-family: "PmingLiu";}#left p:nth-child(3) {position: relative;left: 100px;top: 25px;}#right {width: 300px;height: 320px;float: right;position: relative;right: 150px;bottom: 120px;}#right>p {text-align: center;}#right p:nth-child(1) {position: relative;top: 18px;left: 0;}#right p:nth-child(2) {position: relative;top: 24px;left: 0;}#right p:nth-child(3) {position: relative;top: 28px;left: 0;}#right p:nth-child(4) {position: relative;top: 30px}#right p:nth-child(5) {position: relative;top: 36px;left: 15px;}#right p:nth-child(6) {position: relative;top: 42px;left: 15px;}#right p:nth-child(7) {position: relative;top: 47px;left: 15px;}a {text-decoration: underline;color: black;}</style></head><body><div id="main"><div id="left"><p>本证书由<a>${evaluationOrganization!''}</a>颁发,表明持证人通过本机构组织的职业技能等级认证,具备该职业${occupationName!''}相应技能等级水平。</p><p>This is to certify that the bearer has demonstratedcorresponding competency in this occupation(${occupationEnName!''}) for successful compaction of theoccupational skill Level assessment organized by<a>${evaluationOrganizationEn!''}</a></p><p>${evaluationOrganization}<br />发证日期：${certificateDate!''}</p></div><img src="${imgUrl}" id="photo" /><div id="right"><p>${name!''}</p><p>${certificatesType!''}</p><p>${certificatesCode!''}</p><p>${occupationName!''}</p><p>${worktypeName!''}</p><p>${skillLevel!''}</p><p>${certificateNo!''}</p></div></div></body></html>
四、字体和模板放置的位置
工程使用的是springboot，所以将资源文件放置在src/main/resources下。
