title: How to use Japanese language when convert html to pdf?
body: <p>I have html file with Japan language, I converted pdf file. But it don't show text Japanese.
  This is my code : </p>
  
  <pre><code>final Charset charset = Charset.forName("UTF-8");
      Document document = new Document();
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("html.pdf"));
      document.open();
      XMLWorkerHelper.getInstance().parseXHtml(writer, document, new FileInputStream(filename), charset);
      document.close();
  </code></pre>
  
  <p>example : 
  I have a line text : "ユーザロールを持つユーザだけが利用できるコンテンツ"
  I want to add in pdf file by java then show in pdf file.</p>