Along with the display information for each "row", you'll also need to pass the id value (primary key or whatever other value uniquely identifies the entity).
Then in the body of your row loop, set the value of each checkbox to that id value.
You will end up with a bunch of checkboxes, each of which has the same name but a unique value.
When submited, use the request.getParameterValues() method, passing the common name of the checkboxes, to obtain a String array of all checked values. [ June 12, 2006: Message edited by: Bear Bibeault ]