本文参考来自 https://www.cnblogs.com/mituxiaogaoyang/p/15243103.html

支持windows和linux环境，linux需要安装中文避免乱码问题

<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-JAXB-Internal</artifactId>
    <version>8.3.1</version>
</dependency>
<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-JAXB-ReferenceImpl</artifactId>
    <version>8.3.1</version>
</dependency>
<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-export-fo</artifactId>
    <version>8.3.1</version>
</dependency>

package com.xxx.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.docx4j.Docx4J;
import org.docx4j.fonts.IdentityPlusMapper;
import org.docx4j.fonts.Mapper;
import org.docx4j.fonts.PhysicalFont;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.org.apache.poi.util.IOUtils;
import org.docx4j.fonts.PhysicalFonts;

import java.io.File;
import java.io.FileOutputStream;

public class Word2PdfUtil {

    private static final Log log = LogFactory.getLog(Word2PdfUtil.class);

    public static void main(String[] args) throws Exception {
        String inputWord = "D:\\var\\aa.docx";
        String outputFile = "D:\\var\\bb.pdf";
        boolean isSuccess = Word2PdfUtil.convertDoc2Pdf(inputWord, outputFile);
        System.out.println("convertDoc2Pdf：============" + isSuccess);
    }

    /**
     * docx文档转换为PDF
     *
     * @param docPath WORD文档存储路径
     * @param pdfPath PDF文档存储路径
     * @throws Exception 可能为Docx4JException, FileNotFoundException, IOException等
     */
    public static boolean convertDoc2Pdf(String docPath, String pdfPath) throws Exception {
        FileOutputStream fileOutputStream = null;
        try {
            File file = new File(docPath);
            fileOutputStream = new FileOutputStream(new File(pdfPath));
            WordprocessingMLPackage mlPackage = WordprocessingMLPackage.load(file);
            setFontMapper(mlPackage);
            Docx4J.toPDF(mlPackage, new FileOutputStream(new File(pdfPath)));
            log.info("WORD文档转换为PDF成功===========");
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            log.error("WORD文档转换为PDF失败===========");
        } finally {
            IOUtils.closeQuietly(fileOutputStream);
        }
        return false;
    }

    private static void setFontMapper(WordprocessingMLPackage mlPackage) throws Exception {
        Mapper fontMapper = new IdentityPlusMapper();
        // 加载字体文件（解决linux环境下无中文字体问题）
        if (PhysicalFonts.get("SimSun") == null) {
            System.out.println("加载本地SimSun字体库");
//          PhysicalFonts.addPhysicalFonts("SimSun", WordUtils.class.getResource("/fonts/SIMSUN.TTC"));
        }
        fontMapper.put("隶书", PhysicalFonts.get("LiSu"));
        fontMapper.put("宋体", PhysicalFonts.get("SimSun"));
        fontMapper.put("微软雅黑", PhysicalFonts.get("Microsoft Yahei"));
        fontMapper.put("黑体", PhysicalFonts.get("SimHei"));
        fontMapper.put("楷体", PhysicalFonts.get("KaiTi"));
        fontMapper.put("新宋体", PhysicalFonts.get("NSimSun"));
        fontMapper.put("华文行楷", PhysicalFonts.get("STXingkai"));
        fontMapper.put("华文仿宋", PhysicalFonts.get("STFangsong"));
        fontMapper.put("仿宋", PhysicalFonts.get("FangSong"));
        fontMapper.put("幼圆", PhysicalFonts.get("YouYuan"));
        fontMapper.put("华文宋体", PhysicalFonts.get("STSong"));
        fontMapper.put("华文中宋", PhysicalFonts.get("STZhongsong"));
        fontMapper.put("等线", PhysicalFonts.get("SimSun"));
        fontMapper.put("等线 Light", PhysicalFonts.get("SimSun"));
        fontMapper.put("华文琥珀", PhysicalFonts.get("STHupo"));
        fontMapper.put("华文隶书", PhysicalFonts.get("STLiti"));
        fontMapper.put("华文新魏", PhysicalFonts.get("STXinwei"));
        fontMapper.put("华文彩云", PhysicalFonts.get("STCaiyun"));
        fontMapper.put("方正姚体", PhysicalFonts.get("FZYaoti"));
        fontMapper.put("方正舒体", PhysicalFonts.get("FZShuTi"));
        fontMapper.put("华文细黑", PhysicalFonts.get("STXihei"));
        fontMapper.put("宋体扩展", PhysicalFonts.get("simsun-extB"));
        fontMapper.put("仿宋_GB2312", PhysicalFonts.get("FangSong_GB2312"));
        fontMapper.put("新細明體", PhysicalFonts.get("SimSun"));
        // 解决宋体（正文）和宋体（标题）的乱码问题
        PhysicalFonts.put("PMingLiU", PhysicalFonts.get("SimSun"));
        PhysicalFonts.put("新細明體", PhysicalFonts.get("SimSun"));
        // 宋体&新宋体
        PhysicalFont simsunFont = PhysicalFonts.get("SimSun");
        fontMapper.put("SimSun", simsunFont);
        // 设置字体
        mlPackage.setFontMapper(fontMapper);
    }

}

安装中文字体

从windows的C:\Windows\Fonts拷贝字体到linux服务器fonts目录下，新建目录chinese

cd ../usr/share/fonts

在fonts目录下执行以下命令

字体扩展

mkfontscale

新增字体目录

mkfontdir

刷新缓存

fc-cache -fv

font字体截图

image.png