title: HttpServletRequest UTF-8 Encode
body: <p>I have a problem with HttpServletRequest when I send a params which has a value = "Hành động". But I use 
     String categoryName = request.getParameter("categoryname");</p>
  
  <p>Param categoryName will be "Hành ??ng". I don't understand that error.</p>
  
  <p>Somebody help me???</p>