JSON response to populate listbox

[admirer]

Can any one have the code to use JSON in java.
[Aim:Populate a listbox from a server side response
:@Return a JSON Object from servlet,
==>created using JSON tag library and not hard coded json file].
Using Jquery 1.2.6 JsonGet Method

I browsed through and found json implementations in both javascript and plain JSON ,but I need to do it from a servlet.Im using JSON Library too.
How can I do it with JSONObject,to contain all those options and its values.