Replace url premeters to path based prameter - spring

Question

I have the following controller which accepts an optional "page" parameter.
Right now my URL would look something like mysite.com/pittsburgh-listings?page=2
I want the urls to look like this instead, how can I achieve this?
mysite.com/pittsburgh-listings/2
mysite.com/pittsburgh-listings/3
etc..
My controller
#Controller
public class CityController {
private static final int BUTTONS_TO_SHOW = 5;
private static final int INITIAL_PAGE = 0;
private static final int INITIAL_PAGE_SIZE = 40;
private static final int[] PAGE_SIZES = { 5, 10, 20, 40 };
private AdService adService;
public CityController(AdService adService) {
this.adService = adService;
}
#RequestMapping(value = "/{city:[\\w'-]+}-listings", method = RequestMethod.GET)
public String city(#PathVariable("city") String city, Model model, #RequestParam("page") Optional<Integer> page) {
Database db = new Database();
model.addAttribute("city", city.replace("-", " "));
System.out.println(city.replace("-", " "));
// List<Ad> ads = adService.getPage(1, city.replace("-", " "));
// model.addAttribute("ads", ads);
int evalPageSize = INITIAL_PAGE_SIZE;
int evalPage = (page.orElse(0) < 1) ? INITIAL_PAGE : page.get() - 1;
Long cityId = null;
try {
cityId = db.getCityId(city.replace("-", " "));
} catch (Exception e) {
e.printStackTrace();
}
Page<Ad> ads = adService.findAllPageable(new PageRequest(evalPage, evalPageSize, Sort.Direction.DESC, "id"),
cityId);
System.out.println("Ads: " + ads.getSize());
Pager pager = new Pager(ads.getTotalPages(), ads.getNumber(), BUTTONS_TO_SHOW);
model.addAttribute("ads", ads);
model.addAttribute("selectedPageSize", evalPageSize);
model.addAttribute("pageSizes", PAGE_SIZES);
model.addAttribute("pager", pager);
return "city";
}
}

Answer 1

You can change method signature as follows:
#RequestMapping(value = {"/{city:[\\w'-]+}-listings", "/{city:[\\w'-]+}-listings/{page}"}, method = RequestMethod.GET)
public String city(#PathVariable("city") String city, #PathVariable Optional<Integer> page, Model model) {
// ...
}
In order to map two endpoints (with and without page) in the same controller method and using Java 8 Optional to get page value.