So let me see if I got this right. You have Bean 1 on page 1. You get some
values from a form on that page and store it in bean 1 (perhaps by
auto-population of the bean using the <jsp:setProperty property="*"/>?). In
your servlet (or whatever) you use those values to do a query. The result of
the query is stored in a Vector (or something) in Bean2. You then forward
(or redirect) to Page 2. In that page, you use the Bean 2 and want to list
only a subset of the results. You include a NEXT button. Bean 2 "should" be
session scope for this to work, where as Bean 1 can be request scope since
you are only submitting the query the user types in one time..and there is
no need to store what they typed (unless..ofcourse this is a search engine
or something and you want to preserve what they typed in to show it to them
again). So on page 2, you have say, 10 of 100 results displayed. Now, they
hit the next button. Obviously you will need a "postion" indicate in bean 2
as well, so when they hit NEXT, it increments the position indicator by what
ever factor (10 in this case). So now, your page 2 is displayed again. This
time it starts from the next sub-set and displays the next say, 10 items.
So, what I am not sure I understand is why your having any problems. If bean
2 carries the results (lets again assume a Vector of some objects), and your
using Bean 2 as SESSION scope on page 2, there should be no reason why you
can't list the sub-set items.
<jsp:useBean id="Bean2" scope="session" class="MyBeanPackage.MyBeanClass"/>
<table>
<tr>
<td>Result</td>
</tr>
<%
List l = Bean2.getResults();
int len = l.size();
int start = Bean2.getPosition();
for( int cntr = start; cntr < start + 10; cntr++ )
{
Object o = l.get(cntr);
%>
<tr>
<td><%= o.getResultName() %></td>
</tr>
<%
}
%>
<form name="ResultForm" method="post" action="SomeActionToTake">
<input type="image" src="/images/prev.gif" border="0"
onClick="this.form.action="SomeActionToTake?prev=true">
<input type="image" src="/images/next.gif" border="0"
onClick="this.form.action="SomeActionToTake?next=true">
</form>
In your servlet you might have something like:
if( request.getParameter("prev") != null )
{
// prev was selected..remove 10 from bean start position, then forward to
that JSP page again.
Bean2 b = (Bean2) request.getSession(true).getAttribute("Bean2");
b.setPosition( b.getPosition() - 10 );
}
else
{
// next was selected..add 10 from bean start position, then forward to JSP
page again.
Bean2 b = (Bean2) request.getSession(true).getAttribute("Bean2");
b.setPosition( b.getPosition() + 10 );
}
Now mind you, I am not doing any checking here. Also, the two sumbit buttons
are images right now, and they use a javascript onclick handler to set the
action. You can just as easily use two different forms, or use HRefs to
submit to the server which way to navigate. If the user can enter any data,
check boxes, etc, you will have to use a form to submit what they select or
type in, otherwise, href should be fine if you only providing some text info
via the search results, and a next/prev button. Also, in my JSP example, I
am using Object as the result. Replace this with your object being stored in
the List, and replace List with HashMap or whatever mechanism you are using
to store the list of items. Generally a ResultSet is a Vector.
Hope this helps..if not, feel free to ask more.
-----Original Message-----
From: kaab kaoutar [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 21, 2001 8:02 AM
To: [EMAIL PROTECTED]
Subject: Re: passing ogjects from jsp to jsp
Thanks a lot!
But wht i'm doing so far is to get a request tehn instantiate a bean(bean1)
get the result, store it in another (bean2), then i display some of the
content of bean2(linked list) and add a next button so as to display the
rest of the bean2 in another page(the same that is reloaded)! what u said is
ok but what if the user enters another query will the content change of
bean2?
By the way i know some of sessions but i used to work with php!
>From: Kevin Duffey <[EMAIL PROTECTED]>
>Reply-To: A mailing list about Java Server Pages specification and
>reference <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: passing ogjects from jsp to jsp
>Date: Thu, 21 Jun 2001 07:50:36 -0700
>
>Very simple. Store the result set in a bean with session scope. Then, all
>pages accessed by the same one user during the same one session (most
>servlet engines default 30 minutes of inactivity for a session before
>expiring it) can access this list. If your not familiar with "scope", its
>handy to know. There are basically 3 scopes with beans. Request, Session
>and
>Application. Request means the object exist for the duration of the request
>on the server (including forwarding to a JSP page..so you can have a
>servlet
>put an object in the request passed in, then forward to a JSP page that
>also
>has access to this same object. The engine then discards that object once
>the response goes back to the client). Session exists the entire time the
>user is using your site while their session is still kept alive. All pages
>they access can access this one object (or any object stored in the
>session). Application scope is dangerous but sometimes useful. Its a GLOBAL
>scope that all sessions can use. Therefore its not thread-safe. It is
>useful
>for lookup objects, or routines that are used by many pages for many
>sessions at the same time. But remember, do not put any methods in an
>object
>that can be "written" to at the same time without first syncronizing the
>method(s).
>
>So to store something for the next page to access, you do something like:
>
>request.getSession(true).setAttribute("AttributeName", object);
>
>On the following page, you will have to typecast the object to the right
>type:
>
>MyObject myObject = (MyObject)
>request.getSession(true).getAttribute("AttributeName");
>
>If this hasn't helped, elaborate a bit more and I'll see what I can do.
>
>
> > -----Original Message-----
> > From: A mailing list about Java Server Pages specification and reference
> > [mailto:[EMAIL PROTECTED]]On Behalf Of kaab kaoutar
> > Sent: Thursday, June 21, 2001 3:48 AM
> > To: [EMAIL PROTECTED]
> > Subject: passing ogjects from jsp to jsp
> >
> >
> > Hi!
> > I have a jsp files that generates a linked list by the bean that are
> > instantiated there!
> > iwant the next page to get that linked list and display some of the
>liked
> > list then call itself with an argument so as to display the rest
> > and so on !
> > The main problem is how the second page can use the result es
> > linked list of
> > the first page
> > Thanks
> >
>_________________________________________________________________________
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> > Some relevant FAQs on JSP/Servlets can be found at:
> >
> > http://java.sun.com/products/jsp/faq.html
> > http://www.esperanto.org.nz/jsp/jspfaq.html
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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>
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http://www.esperanto.org.nz/jsp/jspfaq.html
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