servlets - How to calculate the price with session? -


hi have problem servlets. read , know how use them don't know how calculate price.

this need do. hope u can me.

in html code need write form write username , pass in textfileds. when click on button sign in signinservlet.mk generate. servlet need create session keep username html code , sets cookie username. servlet generate “catalog.html” . page contains information products. each product showing picture of it, , next title, price, , button "add cart". pictures products given in folder pictures. informations products kept in class product. classes product , products should used ready-made classes. @ top of page button “buy” activates servlet buyservlet.mk. servlet need calculate total price user need pay products. naplata.html generate username , total price printed.

here html code 

<form action="signinservlet.mk " method="post">                 <label> user name  <input type="text" name="name" > </label>                 <br />                  <label> password  <input type="password" name="pass"></label>                  <br />

and here servlet signinservlet.mk

protected void processrequest(httpservletrequest request, httpservletresponse response)         throws servletexception, ioexception {     response.setcontenttype("text/html;charset=utf-8");     printwriter out = response.getwriter();     try {         cookie ime=new cookie("name",request.getparameter("name"));         ime.setmaxage(60*60*24);         response.addcookie(name);         httpsession session=request.getsession();          products pr = new products();          out.println("<html>");         out.println("<head>");         out.println("<title>catalog</title>");           out.println("</head>");         out.println("<body>");          out.println("<input type='button' action='buyservlet.mk' value='buy products'");         out.println("<br />");         out.println("<br />");         out.println("<br />");         out.println("<br />");          for(int i=0; i<pr.getcatalog().size();i++)         {             out.println("<br />");             out.print("<p><img src='" + pr.getkatalog().get(i).getpicture()+ "'>");             out.print(pr.getkatalog().get(i).gettitle());             out.print(pr.getkatalog().get(i).getprice());             out.print("<input type='button' value='add card'"></p> ");         }         out.println("</body>");         out.println("</html>");

i wrote function don't know how add button.

public void add(httpsession session ,double price){      double sum=(double)session.getattribute("sum");     if(sum==null){         sum = new double(price);     }         else {         sum = new double(sum.intvalue()+ price);     }     session.setattribute("sum", sum);     }


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