problem in setAttribute() and getAttribute() functions

[madhuri kunchala]

hi,
im my application..i need to do modification to my file...i m trying to get values which already exists in combo box...here is my code..

 
String allowPostPaid = "";
        request.setAttribute("allowPostPaid", allowPostPaid);
        String strCombo = "";
        strCombo = (String) request.getAttribute("allowPostPaid");
        if (strCombo == null)
        {
            strCombo = request.getParameter("allowPostPaid");
        }
        else
        {
            strCombo = (String) request.getAttribute("allowPostPaid");
        }

down in method im calling 'strCombo'.. i need help whats wrong with my code..

[Prasad Krishnegowda]

Are you getting any error or what? Also, when you set attribute in request, it is available only when, the control is passed to the servlet or a JSP. I suggest, you to use session, for this..

[madhuri kunchala]

kk.i'll try and let you know..then no need of javascript validation

[madhuri kunchala]

i tired but im not getting values in jsp page..here is my modified code..

 
HttpSession session = request.getSession();
String combo = ""  ;
session.setAttribute("allowPostPaid",combo);
String strCombo = "";
strCombo = (String) session.getAttribute("allowPostPaid");
if (strCombo == null)
  {
       strCombo = request.getParameter(strCombo);
   }
else
   {
       strCombo = (String) session.getAttribute("allowPostPaid");
    }

can you tell me where to change my code..

[David Newton]

I don't understand what you're trying to do, nor do you provide the JSP code that you want to work.

// Gets the session.
HttpSession session = request.getSession();

// Sets "combo" to an empty string.
String combo = ""  ;

// Puts an empty string into session.
session.setAttribute("allowPostPaid",combo);

// Sets "strCombo" to an empty string.
String strCombo = "";

// Sets "strCombo" to an empty string again, but from the session.
strCombo = (String) session.getAttribute("allowPostPaid");

 // This will never be true; it was just set to an empty string.
if (strCombo == null) { 
    strCombo = request.getParameter(strCombo);
} 
// Set "strCombo" to an empty string again.
else 
{
    strCombo = (String) session.getAttribute("allowPostPaid");
}

At this point there's an empty string in the session, and an empty string in the servlet.

Is that what you want? And why go to so much trouble to make it that way?