How do I retrieve query parameters in a Spring Boot controller?

I am developing a project using Spring Boot. I've a controller which accepts GET requests.

Currently I'm accepting requests to the following kind of URLs:

http://localhost:8888/user/data/002

but I want to accept requests using query parameters:

http://localhost:8888/user?data=002

Here's the code of my controller:

@RequestMapping(value="/data/{itemid}", method = RequestMethod.GET)public @ResponseBodyitem getitem(@PathVariable("itemid") String itemid) {       item i = itemDao.findOne(itemid);                  String itemname = i.getItemname();    String price = i.getPrice();    return i;}