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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

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<!-- https://mvnrepository.com/artifact/cn.afterturn/easypoi-spring-boot-starter -->
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-spring-boot-starter</artifactId>
    <version>4.5.0</version>
    <exclusions>
        <exclusion>
            <artifactId>hutool-all</artifactId>
            <groupId>cn.hutool</groupId>
        </exclusion>
    </exclusions>
</dependency>

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<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>4.0.1</version>
</dependency>

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<!-- 本地jar -->
<dependency>
    <groupId>com.aspose.words</groupId>
    <artifactId>apose</artifactId>
    <version>15.8.0</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/aspose-words-15.8.0-jdk16.jar</systemPath>
</dependency>

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import freemarker.template.Configuration;
import freemarker.template.Template;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import com.aspose.words.License;

/**
 * freemarker模板生成pdf
 */
@SneakyThrows
private void freemarkerGenePdf(HttpServletResponse response) {
    // 1. freemarker to word.xml
    // a.构建模板
    Configuration cfg = new Configuration(Configuration.VERSION_2_3_30);
    cfg.setClassForTemplateLoading(this.getClass(), "/");
    // .ftl文件，先将word转xml，再改文件后嘴得到
    Template template = cfg.getTemplate(this.getClass().getResource("/").getPath() + "template" + File.separator + "zxalive.com账单.ftl");
    // b.构建输出流
    File docxTemp = File.createTempFile("temp", ".docx");
    // c.构建map
    Map<String, Object> dataMap = new HashMap<>();
    dataMap.put("key1", "value1");
    dataMap.put("key2", 123);
    dataMap.put("key3", true);
    try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(docxTemp), StandardCharsets.UTF_8))) {
        // d.渲染
        template.process(dataMap, writer);
    }

    // 2. word.xml to word
    File xmlFile = new File(docxTemp.getAbsolutePath());
    File wordFile = new File(xmlFile.getParent(), xmlFile.getName().replace(".xml", ""));
    // xml重命名为word
    xmlFile.renameTo(wordFile);

    // 3. word to pdf
    File pdfFIle = File.createTempFile("temp", ".pdf");
    // 验证License 若不验证则转化出的pdf文档会有水印产生
    try (InputStream licenseIn = this.getClass().getResourceAsStream("/license/license.xml")) {
        new License().setLicense(licenseIn);
    }
    try (XWPFDocument document = new XWPFDocument(new FileInputStream(wordFile));
         BufferedOutputStream pdfbos = new BufferedOutputStream(new FileOutputStream(pdfFIle));
    ) {
        document.write(pdfbos);
        pdfbos.flush();
    }

    // 4. web下载pdf
    try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(pdfFIle.getAbsolutePath()))) {
        // 构建response
        response.setHeader("content-disposition", "attachment;fileName=" + URLEncoder.encode("fileName", StandardCharsets.UTF_8)
                .replaceAll("\\+", "%20")
                .replaceAll("%2F", "/")
                + ".xlsx");
        response.setContentType("application/vnd.ms-excel"); // application/json application/pdf
        response.setCharacterEncoding(StandardCharsets.UTF_8.name());
        BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());

        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }
        out.flush();
    }
}