写cookie   Cookie cookie = new Cookie(“username”, java.net.URLEncoder.encode(username,”UTF-8”));

   cookie.setMaxAge(50 60);//不设置的话，则cookies不写入硬盘,而是写在内存,只在当前页面有用,以秒为单位   

   response.addCookie(cookie);

*读cookie   Cookie cookies[] = request.getCookies();     if (cookies != null)     {         for (int i = 0; i < cookies.length; i++)         {                     if (cookies[i].getName().equals(“username”))                      {             username= java.net.URLDecoder.decode(cookies[i].getValue().trim(),”UTF-8”);

         }         }     }    总结：在保存到cookie的时候要用URLEncoder.encode(username,”UTF-8”))方法保存 读的时候要用URLDecoder.decode(cookies[i].getValue().trim(),”UTF-8”)方法来解码