通过 thymeleaf生成HTML转PDF

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.18</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.albert.springdemo</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <thymeleaf.version>3.0.15.RELEASE</thymeleaf.version>
        <bouncycastle.version>1.68</bouncycastle.version>
    </properties>

    <dependencies>
        <!-- Spring Web依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- tools -->
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.30</version>
        </dependency>

        <!-- logback -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.11</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.2.11</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.36</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.7.36</version>
        </dependency>



        <!-- Flying Saucer 核心库 -->
        <dependency>
            <groupId>org.xhtmlrenderer</groupId>
            <artifactId>flying-saucer-core</artifactId>
            <version>9.1.22</version>
        </dependency>

        <!-- Flying Saucer PDF 支持 -->
        <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>

        <!-- Thymeleaf -->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf</artifactId>
            <version>3.0.15.RELEASE</version>
        </dependency>





        <!-- io utils -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-io</artifactId>
            <version>1.3.2</version>
        </dependency>




        <!-- Spring Boot测试依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <!-- 排除Junit5中不兼容JDK 1.8的组件 -->
            <exclusions>
                <exclusion>
                    <groupId>org.junit.jupiter</groupId>
                    <artifactId>junit-jupiter-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- 添加对JDK 1.8友好的测试库 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- Spring Boot Maven插件 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

package com.albert.springboot.flyingsaucer;

import com.albert.springboot.models.ReportInfo;
import com.albert.springboot.thymeleaf.ThymeleafTools;
import com.lowagie.text.pdf.BaseFont;
import lombok.extern.slf4j.Slf4j;
import org.xhtmlrenderer.pdf.ITextRenderer;

import java.io.*;

@Slf4j
public class FlyingSaucerTest {
    public static void main(String[] args) throws Exception {
        // 使用thymeleaf模板生成html
        String htmlText = ThymeleafTools.loadTextFromTpl("report", ReportInfo.builder()
                .title("Report's Title 中文标题")
                .build());
        log.info("html: {} ", htmlText);

        // 通过 flying faucer 生成pdf文件
        ITextRenderer renderer = new ITextRenderer();
        loadChineseFont(renderer);
        renderer.setDocumentFromString(htmlText);
        renderer.layout();
        File out = new File("D:\\usr\\local\\code\\albert\\spring-boot-demo\\src\\main\\resources\\out\\report.pdf");
        log.info("export to file :{}", out.getAbsolutePath());
        FileOutputStream fos = new FileOutputStream(out);
        renderer.createPDF(fos);


    }

    public static void loadChineseFont(ITextRenderer renderer) throws Exception {
        File fontDir = new File(FlyingSaucerTest.class.getResource("/").getPath(), "fonts");
        for (File fontFile : fontDir.listFiles()) {
            log.info("load font file: {}", fontFile.getAbsoluteFile());
            renderer.getFontResolver().addFont(fontFile.getAbsolutePath(), BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
        }


    }
}

package com.albert.springboot.thymeleaf;

import com.albert.springboot.models.ReportInfo;
import lombok.extern.slf4j.Slf4j;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;

@Slf4j
public class ThymeleafTools {
    public static void main(String[] args) throws Exception {
        ReportInfo report = ReportInfo.builder().title("Report Infos").build();
        String htmlText = loadTextFromTpl("report.html", report);
        log.info("htmlText: {}", htmlText);
    }

    public static String loadTextFromTpl(String template,ReportInfo report) {
        ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
        templateResolver.setPrefix("tpl/");
        templateResolver.setSuffix(".html");
        templateResolver.setTemplateMode(TemplateMode.TEXT);
        templateResolver.setCharacterEncoding("UTF-8");

        TemplateEngine engin = new TemplateEngine();
        engin.setTemplateResolver(templateResolver);

        Context context = new Context();
        context.setVariable("report", report);

        return engin.process(template, context);
    }
}