qusongtao / demo-pdf Goto Github PK

楼主你好：
我在使用你这个开源项目的时候遇到了一个问题，就是我的ftl文件非常大，用你的Dom解析很慢，需要几十秒钟。您的代码如下：
`/**

• 按模板和参数生成html字符串,再转换为flying-saucer识别的Document
• @param templateName freemarker模板名称
• @param variables freemarker模板参数
• @return Document
  */
  private static Document generateDoc(FreeMarkerConfigurer configurer, String templateName,
  Map<String, Object> variables) {
  Template tp;
  try {
  tp = configurer.getConfiguration().getTemplate(templateName);
  } catch (IOException e) {
  LOGGER.error(e.getMessage(), e);
  return null;
  }
  StringWriter stringWriter = new StringWriter();
  try (BufferedWriter writer = new BufferedWriter(stringWriter)) {
  try {
  tp.process(variables, writer);
  writer.flush();
  } catch (TemplateException e) {
  LOGGER.error("模板不存在或者路径错误", e);
  } catch (IOException e) {
  LOGGER.error("IO异常", e);
  }
  DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
  return builder.parse(new ByteArrayInputStream(stringWriter.toString().getBytes()));
  } catch (Exception e) {
  LOGGER.error(e.getMessage(), e);
  return null;
  }
  }调用方式： Document doc = generateDoc(configurer, templateName, map);
  renderer.setDocument(doc, null); -----------------------我改用了如下方式---------------------StringWriter writer = new StringWriter();
  Template template = configurer.getConfiguration().getTemplate(templateName);
  template.process(map, writer);
  writer.flush();
  String html = writer.toString();
  renderer.setDocumentFromString(html);`
  解析时间缩短至 ms 级别。