jsp界面使用cookie实现换肤

if (request.getParameter("theme") != null) {
  Cookie cookie2 = new Cookie("formThemes", request.getParameter(
    "theme").toString());
  cookie2.setPath("/");
  //  cookie2.setDomain(host);
  cookie2.setMaxAge(33333333);
  response.addCookie(cookie2);
  request.setAttribute("formThemes",request.getParameter(
  "theme").toString());
 }else{
  //初次进入去默认的皮肤或者是cookie中已经存在的皮肤
  Cookie[] cookies = request.getCookies();
  if(cookies != null && cookies.length > 0 ){
   for(int i = 0 ; i < cookies.length ; i ++){
    Cookie cookie = (Cookie)cookies[i];
    if("formThemes".equals(cookie.getName())){
     request.setAttribute("formThemes",cookie.getValue());
    }
   }
  } else {
   //不存在cookie，则设置默认值national
   request.setAttribute("formThemes","national");
  }
  
 }cookie