I will try to keep is as simple as possible.
First, in your datalist on screen, you put anchor tags that go to your servlet.
for example
<a href="./mydataservlet?action=getrow&myid=${element.id}"> click to select </a>
so for example, for each row you get :
<a href="./mydataservlet?action=getrow&myid=1"> click to select </a>
<a href="./mydataservlet?action=getrow&myid=2"> click to select </a>
<a href="./mydataservlet?action=getrow&myid=3"> click to select </a>
When clicked on the link that will be generated, you come in mydataservlet, where you can retrieve the action en myid parameters.
action is, for example, "getrow".
When getrow is triggered, you look for the parameter "myid".
Now, in your servlet, you got the ID of the row that is selected.
if your details LIST is in your session, you can use it again.
get the list, and from that list, get the details-instance.
You can do this because you have "myid"!
now you got your detail instance.
now, for example, you can put that detail instance in the session.
after that, redirect to your jsp page
and in your jsp page you kan use something like :
<input type="text" value="${detail.name}" name="name">
wich for example will be translated into :
<input type="text" value="john doe" name="name">
now, your fields will contain the data from selected row, and your listview will be rendered again.
There are a lot of ways to achieve such a things, but the basics remain the same. And this is a pretty basic method.
