java IO创建HTML版PDF

public void viewPDF() {
    String tid = (String) getSessionAttr(SessionConstants.SELECTED_TENANT_ID);
    int personId = getSessionAttr(SessionConstants.USER_PERSON_ID_INT);
    Person applyPerson = PersonService.service.getPersonById(personId);
    String savePath = PropKit.get("uploadedFileSaveDirectory") + tid + File.separator + "sys" + File.separator;
    //String fileName = createPDF(applyPerson, tid);
   /* SysUploadFile suf = new SysUploadFile();
    suf.set("filename", "ABEC-IncomeCertificate.pdf");
    suf.set("savename", "");
    suf.set("filepath", savePath);
    suf.save();
    OnlineProof onlineProof = new OnlineProof();
    onlineProof.set("id", getPara("id"));
    onlineProof.set("upload_id", suf.get("id"));
    onlineProof.update();*/
    File htmlFile;
    File htmlMidFile = null;
    //FileReader reader = null;
    InputStreamReader reader = null;
    FileWriter writer = null;
    String url = this.getRequest().getServletContext().getRealPath("/");
    String proofType = getPara("proofType");
    String fileName = "";
    String country = getPara("country");
    String travelMode = getPara("travelMode");
    String fileUrl = url + "/resources/kong/";
    switch (proofType) {
        case "1":
            fileUrl += "Working Certificate.html";
            fileName += "Working Certificate";
            break;
        case "2":
            fileUrl += "Working and Income Certificate.html";
            fileName += "Working and Income Certificate";
            break;
        case "3":
            fileUrl += "Certificate for Loan.html";
            fileName += "Certificate for Loan";
            break;
        case "4":
            if ("1".equals(travelMode)) {
                if ("1".equals(country) || "2".equals(country) || "3".equals(country)
                        || "5".equals(country) || "6".equals(country) || "7".equals(country)) {
                    fileUrl += "Certificate for Visa - EU&Business.html";
                } else if ("8".equals(country)) {
                    fileUrl += "Certificate for Visa - UK&Business.html";
                } else if ("9".equals(country) || "10".equals(country) || "12".equals(country)) {
                    fileUrl += "Certificate for Visa - Asia&Business.html";
                } else if ("11".equals(country)) {
                    fileUrl += "Certificate for Visa - Taiwan&Businessl.html";
                }
            } else if ("2".equals(travelMode)) {
                if ("1".equals(country) || "2".equals(country) || "3".equals(country)
                        || "5".equals(country) || "6".equals(country) || "7".equals(country)) {
                    fileUrl += "Certificate for Visa - EU&Personal.html";
                } else if ("8".equals(country)) {
                    fileUrl += "Certificate for Visa - UK&Personal.html";
                } else if ("9".equals(country) || "10".equals(country) || "12".equals(country)) {
                    fileUrl += "Certificate for Visa - Asia&Personal.html";
                } else if ("11".equals(country)) {
                    fileUrl += "Certificate for Visa - Taiwan&Personal.html";
                }
            }
            fileName += "Certificate for Visa";
            break;
        case "5":
            fileUrl += "";
            fileName += "Certificate";
            break;
    }
    htmlFile = new File(fileUrl);// 指定要读取的文件

    try {

        reader = new InputStreamReader(new FileInputStream(htmlFile), "utf-8");
        //reader = new FileReader(htmlFile);
        // 获取该文件的输入流
        char[] bb = new char[1024];// 用来保存每次读取到的字符
        String str = "";// 用来将每次读取到的字符拼接，当然使用StringBuffer类更好
        int n;// 每次读取到的字符长度
        while ((n = reader.read(bb)) != -1) {
            str += (new String(bb, 0, n));
        }
        System.out.println(str);
        //替换HTML参数
        //str = str.replace("@Name_Cn@","test");

        htmlMidFile = new File(savePath + fileName+ ".html");// 要写入的文本文件

        if (!htmlMidFile.exists()) {// 如果文件不存在，则创建该文件
            htmlMidFile.createNewFile();
        }
        writer = new FileWriter(htmlMidFile);// 获取该文件的输出流
        writer.write(str);// 写内容
        writer.flush(); // 清空缓冲区，立即将输出流里的内容写到文件里
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (writer != null) {
            try {
                writer.close(); // 关闭输出流，施放资源
            } catch (IOException ignored) {
            }
        }
        if (reader != null) {
            try {
                reader.close(); // 关闭输入流，释放连接
            } catch (IOException ignored) {
            }
        }
    }
    //下载PDF文档
    Document document;
    // 将html转为pdf
    document = new Document(PageSize.A4, 36, 36, 108, 108);
    // 解决中文支持问题
    PdfWriter pdfwriter;
    try {
        pdfwriter = PdfWriter.getInstance(document, new FileOutputStream(savePath + fileName +  ".pdf"));
        document.open();
        String path = this.getRequest().getServletContext().getRealPath("/");
        Image img = Image.getInstance(path + "/img/ABEC.png");
        img.setAbsolutePosition(0, 0);
        img.scaleToFit(900, 860);
        document.add(img);
        //加载HTML
        XMLWorkerHelper.getInstance()
                .parseXHtml(
                        pdfwriter,
                        document,
                        new InputStreamReader(new FileInputStream(htmlFile), "utf-8"));
    } catch (DocumentException | IOException e) {
        e.printStackTrace();
    } finally {
        document.close();
        // 删除临时html
        htmlMidFile.delete();
    }
    //下载PDF
    try {
        FileOperateUtil.downloadx(getRequest(), getResponse(),
                savePath + fileName + ".pdf", "application/octet-stream",
                fileName + ".pdf");
    } catch (IOException e) {
        e.printStackTrace();
    }
}