Are u reffering to records  from a database ?

In that case assign the primary key of the record
to the checkbox value.
Now when the checkbox is selected get the value
and fetch the record.

This may help you,
1. You are fetching details from DATABASE.
2. from jsp  you passthis code to browser:
<%@ page  language="java" import="java.sql.*,java.io.*,java.util.*" %>
<%

String type=request.getParameter("somedummy");
try{
--- stuff wil come here - retrieving  and storing in result set

out.println(""+resultSet.getString("id")+\
"");

} catch(Exception e)
{
out.println("<h1>"+"Server Error"+ e+ "<h1>");
}

%>

3. Revert Back if u need my help