HTML生成下载PDF文件或ZIP压缩包文件

1. 工具类（下载到本地）

public class FreemarkerReportWriter {

    /**
     * 字体文件名称
     */
    private final static String DEFAULT_FONT = "yahei.ttf";

 /** 
   * templateContent ftl 模版内容 
   * data ftl 模版数据 
   * file 下载本地 PDF 文件
   * classPath 文件路径
 */
    public static void createPdf(String templateContent, Map data, File file, String classPath) {
        FileOutputStream outputStream = null;
        ITextRenderer renderer = new ITextRenderer();
        try {Configuration cfg = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
            StringTemplateLoader stringLoader = new StringTemplateLoader();
            stringLoader.putTemplate("myTemplate", templateContent);
            cfg.setTemplateLoader(stringLoader);
            Template template = cfg.getTemplate("myTemplate", "utf-8");
            String htmlData = FreeMarkerTemplateUtils.processTemplateIntoString(template, data);
            outputStream = new FileOutputStream(file);
            ITextFontResolver fontResolver = renderer.getFontResolver();
            // 解决中文乱码问题，fontPath 为中文字体地址
            fontResolver.addFont(classPath + DEFAULT_FONT, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            renderer.setDocumentFromString(htmlData);
            renderer.layout();
            renderer.createPDF(outputStream);
        } catch (Exception e) {log.error("生成失败", e);
        } finally {renderer.finishPDF();
            IOUtils.closeQuietly(outputStream);
        }
    }

    public static void exportPdf(String templateContent, Map data, HttpServletResponse response) {
        File file = null;
        try {String classPath = PdfExportUtil.class.getProtectionDomain().getCodeSource().getLocation().getPath();
            log.info("classPath 路径:{}", classPath);
            String fileName = System.currentTimeMillis() + ".pdf";
            createPdf(templateContent, data, new File(classPath + fileName), classPath);
            log.info("pdf 长度:{}", new File(classPath + fileName).length());
            file = new File(classPath + fileName);
            ServletOutputStream outputStream = response.getOutputStream();
            FileInputStream fileInputStream = new FileInputStream(file);
            byte[] buffer = new byte[1024];
            int len;
            while ((len = fileInputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, len);
            }
            fileInputStream.close();
            outputStream.flush();
            outputStream.close();} catch (Exception e) {log.error("生成 PDF 失败", e);
        } finally {
            // 清理文件
            file.delete();}
    }

    public static void exportZip(String templateContent, List

2. 工具类（浏览器预览）

public class FreemarkerReportWriter {

    /**
     * 字体文件名称
     */
    private final static String DEFAULT_FONT_PATH = "fonts/simsun.ttf";
    private final static String DEFAULT_FONT = "SimSun";
    private final static String DEFAULT_PDF = ".pdf";
    private final static String TEMPLATE_NAME = "myTemplate";

    /**
     * fileName 文件名称
     * templateContent ftl 模版内容
     * data ftl 模版数据
     * attachment 是否以下载附件的方式查看报表，否则以在线方式查看报表
     * response HttpServletResponse
     */
    public static void exportPdf(String fileName, String templateContent, Map data, boolean attachment, HttpServletResponse response) {Assert.hasLength(fileName, "The parameter `fileName` can not be empty.");
        Assert.hasLength(templateContent, "The parameter `templateContent` can not be empty.");
        if (!fileName.toLowerCase().endsWith(DEFAULT_PDF)) {fileName += ".pdf";}
        ServletOutputStream outputStream = null;
        // 设置响应头
        response.setContentType("application/pdf");
        MimeDispositionType mimeDispositionType = attachment ? MimeDispositionType.attachment : MimeDispositionType.inline;
        response.setHeader("Content-Disposition", FileUtil.getContentDisposition(fileName, mimeDispositionType));
        try {byte[] bytes = createPdf(templateContent, data);
            log.debug("pdf file length:{}", bytes.length);
            outputStream = response.getOutputStream();
            outputStream.write(bytes);
        } catch (Exception e) {log.error("create pdf file failed:", e);
        } finally {IoUtil.close(outputStream);
        }
    }

    /**
     * templateContent ftl 模版内容
     * mapList ftl 模版数据
     * response HttpServletResponse
     */
    public static void exportZip(String templateContent, List

3.controller 接口

@GetMapping("/exportPdf")
@ApiOperation("导出 PDF")
public UnifyResponse exportPdf(@RequestParam("principalId") String principalId, HttpServletResponse response) {PrincipalInstrumentVO instrumentVO = principalInstrumentService.detail(principalId);
    if (BeanUtil.isNotEmpty(instrumentVO)) {
        // 设置响应头
        response.setContentType("application/pdf");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Disposition", "inline; filename="pdf.pdf"");
        PdfExportUtil.exportPdf(instrumentVO.getHtmlContent(), new HashMap(8), response);
    }
    return null;
}

@GetMapping("/exportZip")
@ApiOperation("导出 ZIP")
public UnifyResponse exportZip(@RequestParam("principalId") String principalId, HttpServletResponse response) {List

4. 说明

templateContent 为 FreeMarker 模板的 HTML 内容