最近公司有个打印文件的需求，既然是打印，为了格式统一肯定使用PDF文件比较好，查了一下JAVA中大部分是使用IText创建PDF的，学习了下他人的方法，最终实现根据Freemarker模板生成PDF的方法

依赖

<dependency>
      <groupId>org.freemarker</groupId>
      <artifactId>freemarker</artifactId>
      <version>2.3.28</version>
</dependency>
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.11</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.itextpdf.tool/xmlworker -->  
<dependency>
    <groupId>com.itextpdf.tool</groupId>
    <artifactId>xmlworker</artifactId>
    <version>5.5.11</version>
</dependency>

实际代码

freemarker模板文件 template.ftl

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <title>Title</title>
    <style>
        body {
            font-family: SimHei;
        }

        .blue {
            color: blue;
        }
    </style>
</head>
<body>
<div class="blue">
    你好111，${name}
    <ul>
        <#list models as o>
            <li>${o.uuid}</li>
        </#list>
    </ul>
</div>
</body>
</html>

根据freemarker模板生成HTML

public static String freeMarkerRender(Map<String, Object> data, String url, String htmlTmp) {
    Writer out = new StringWriter();
    try {
        freemarkerCfg.setDirectoryForTemplateLoading(new File(url));
        freemarkerCfg.setDefaultEncoding("UTF-8");
        // 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;
}

根据HTML生成PDF文件

public static void createPdf(OutputStream out, String content, String dest) throws IOException, DocumentException {
    // step 1
    Document document = new Document();
    // step 2
    PdfWriter writer = PdfWriter.getInstance(document, out);
    // step 3
    document.open();
    // step 4
    XMLWorkerFontProvider fontImp = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
    fontImp.register(FONT);
    XMLWorkerHelper.getInstance().parseXHtml(writer, document,
            new ByteArrayInputStream(content.getBytes("UTF-8")), null, Charset.forName("UTF-8"), fontImp);
    // step 5
    document.close();
    }

测试代码

private static final String HTML = "PaperTemplate.ftl";
private static final String FONT = "C:\\app\\simhei.ttf";
@RequestMapping("/download/{id}")
@ResponseBody
public Object download(@PathVariable Long id, HttpSession httpSession) throws IOException, DocumentException {
    Map<String, Object> data = new HashMap<>();
    data.put("name", "张三");
    data.put("model", paperServ.getAll());
    String url = httpSession.getServletContext().getRealPath("/") + "download" + File.separator;
    String html = freeMarkerRender(data, url, HTML);
    ServletOutputStream out = getResponse().getOutputStream();
    createPdf(out, html, DEST);
    out.flush();
    IOUtils.closeQuietly(out);
    return html;
    }

效果图