Passing parameters in jsp

Question

Hi friends,
I am very new to oracle pdk. But unfortunately i was assigned to a small pdk development using jsp.
How can i send parameters in the Oracle jpdk multipage sample portlet .
The first.jsp says ,
<%
PortletRenderRequest prr = (PortletRenderRequest) request.getAttribute(HttpCommonConstants.PORTLET_RENDER_REQUEST);
NameValuePair[] linkParams = new NameValuePair[1];
linkParams[0] = new NameValuePair(HttpPortletRendererUtil.portletParameter(request, "next_page"), "/htdocs/multipage/second.jsp");
%>
<center>
Hello, this is the first page<p>
<%=UrlUtils.constructHTMLLink(prr, UrlUtils.PAGE_LINK, "second page", "", linkParams, true, true)%>
</center>
Now where should i add the parameter which i have to send to the second page named second.jsp.
In the same way how to receive the parameter values in the second.jsp file, the second.jsp is listed here as below.
<%
PortletRenderRequest prr = (PortletRenderRequest) request.getAttribute(HttpCommonConstants.PORTLET_RENDER_REQUEST);
NameValuePair[] linkParams = new NameValuePair[1];
linkParams[0] = new NameValuePair(HttpPortletRendererUtil.portletParameter(request, "next_page"), "/htdocs/multipage/first.jsp");
linkParams[1] ="a=hello";
%>
<center>
Hello, this is the second page<p>
<%=UrlUtils.constructHTMLLink(prr, UrlUtils.PAGE_LINK,
"first page", "", linkParams, true, true)%>
</center>
Please write to me an example in detail.
Matter is very urgent.

Answer 1

I just recently put a set of helper classes on my knowledge exchange site specifically to help with passing parameters via the url.
http://portalstudio.oracle.com/servlet/page?_pageid=2106&_dad=ops&_schema=OPSTUDIO&_type=site&_fsiteid=233&_fid=433232&_fnavbarid=180376&_fnavbarsiteid=233&_fedit=0&_fmode=2&_fdisplaymode=1&_fcalledfrom=1&_fdisplayurl=
I called it Portal Tools. It includes usage documentation.
but, to stick with the code example you provided,
Technically, you can pass parameters at least three different ways:
-Using portal's parameter-event processing (portlets interact with portal for parameters)
-Using qualified parameter names (portlets only see "their" parameters)
-Using unqualified parameter names (portlets are responsible for unique names, name collisions, etc)
I would generally shy away from the unqualified parameter method; it was put in to support older versions of portal.
The example you provided currently uses qualified parameters, so I will answer with that method.
To add a parameter "a" with a value of "hello",
change the setup of the link parameters in first.jsp to this:
NameValuePair[] linkParams = new NameValuePair[2];
linkParams[0] = new NameValuePair(HttpPortletRendererUtil.portletParameter(request, "next_page"), "/htdocs/multipage/second.jsp");
linkParams[1] = new NameValuePair(HttpPortletRendererUtil.portletParameter(request, "a"), "hello");
note that in the definition line, you must allocate space for EXACTLY how many parameters you are using (2 now, rather than 1). Then in the assignment lines, it is using java standard ZERO based indexing, so the new second parameter is at index 1.
to get (and display) the parameter in the second.jsp page, you would include something such as this:
Parameter "A" contains a value of <%= prr.getParameter("a") %>.
note how you just ask the PRR for the parameter with the unqualified name.
The "next_page" parameter is defined (in the provider.xml) to be used by portal to manage page flow and display. That is why you only have to set the "next_page" parameter.
I hope this helps.
Craig