public class PdfUtil {

  /*
   * 生成pdf工具類
   * wmy 12:40 2019/8/9
   * @Param [guideBook, pdfPath]
   * @return java.lang.Boolean
   **/
  public static Boolean htmlToPdf(GuideBook guideBook, String pdfPath) {
    try {
      // 1.新建document
      Document document = new Document();
      // 2.建立一個書寫器(Writer)與document對象關聯，通過書寫器(Writer)可以將文檔寫入到磁盤中。
      //創(chuàng)建 PdfWriter 對象 第一個參數是對文檔對象的引用，第二個參數是文件的實際名稱，在該名稱中還會給出其輸出路徑。
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(pdfPath));
      // 3.打開文檔
      document.open();
      //要解析的html
      //html轉換成普通文字,方法如下:
      org.jsoup.nodes.Document contentDoc = Jsoup.parseBodyFragment(getHtml(guideBook.getTitle())+guideBook.getContent());
      org.jsoup.nodes.Document.OutputSettings outputSettings = new org.jsoup.nodes.Document.OutputSettings();
      outputSettings.syntax(org.jsoup.nodes.Document.OutputSettings.Syntax.xml);
      contentDoc.outputSettings(outputSettings);
      String parsedHtml = contentDoc.outerHtml();
      //這兒的font-family不支持漢字，{font-family:仿宋} 是不可以的。
      InputStream cssIs = new ByteArrayInputStream("* {font-family: PingFang-SC-Medium.otf;}".getBytes("UTF-8"));
      //第四個參數是html中的css文件的輸入流
      //第五個參數是字體提供者，使用系統(tǒng)默認支持的字體時，可以不傳。
      XMLWorkerHelper.getInstance().parseXHtml(writer, document, new ByteArrayInputStream(parsedHtml.getBytes()), cssIs);
      // 5.關閉文檔
      document.close();
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  /*
   * 下載文件
   * wmy 9:54 2019/8/12
   * @Param [request, response, inputStream, fileName]
   * @return void
   **/
  public static void download(HttpServletRequest request, HttpServletResponse response, InputStream inputStream, String fileName){
    BufferedOutputStream bos = null;
    try {
      // 定義輸出緩沖 10k
      byte[] buffer = new byte[10240];
      //文件名稱的處理
      // http://127.0.0.1:5002/guide-book/pdf?id=124
      fileName = fileName.replaceAll("[\\pP\\p{Punct}]", "-").replace(" ", "-").replaceAll("[-]+", "-")+".pdf";
      String userAgent = request.getHeader("user-agent").toLowerCase();
      if (userAgent.contains("msie") || userAgent.contains("like gecko")) {
        fileName = URLEncoder.encode(fileName, "UTF-8");
      } else {
        fileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");
      }
      response.setCharacterEncoding("utf-8");
      response.setContentType("application/msword");
      response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
      bos = new BufferedOutputStream(response.getOutputStream());
      int bytesRead = 0;
      while ((bytesRead = inputStream.read(buffer)) != -1) {
        bos.write(buffer, 0, bytesRead);
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (bos != null) {
        try {
          bos.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  /*
   * 獲取html
   * wmy 10:39 2019/8/12
   * @Param [title]
   * @return java.lang.String
   **/
  public static String getHtml(String title){
    return "<h1 align=\"center\">"+title+"</h1>";
  }

}