Javaを使用してCMSシステムの広告管理機能を実装する方法

@Controller
@RequestMapping("/adPosition")
public class AdPositionController {

    @Autowired
    private AdPositionService adPositionService;

    @GetMapping("/list")
    public String list(Model model) {
        List<AdPosition> positions = adPositionService.getAll();
        model.addAttribute("positions", positions);
        return "adPosition/list";
    }

    @GetMapping("/create")
    public String createForm(Model model) {
        model.addAttribute("position", new AdPosition());
        return "adPosition/form";
    }

    @PostMapping("/create")
    public String create(@ModelAttribute AdPosition position) {
        adPositionService.create(position);
        return "redirect:/adPosition/list";
    }

    @GetMapping("/edit/{id}")
    public String editForm(@PathVariable("id") Long id, Model model) {
        AdPosition position = adPositionService.getById(id);
        model.addAttribute("position", position);
        return "adPosition/form";
    }

    @PostMapping("/edit/{id}")
    public String edit(@PathVariable("id") Long id, @ModelAttribute AdPosition position) {
        adPositionService.update(id, position);
        return "redirect:/adPosition/list";
    }

    @GetMapping("/delete/{id}")
    public String delete(@PathVariable("id") Long id) {
        adPositionService.delete(id);
        return "redirect:/adPosition/list";
    }

}

@Controller
@RequestMapping("/ad")
public class AdController {

    @Autowired
    private AdService adService;

    @GetMapping("/list")
    public String list(Model model) {
        List<Ad> ads = adService.getAll();
        model.addAttribute("ads", ads);
        return "ad/list";
    }

    @GetMapping("/create")
    public String createForm(Model model) {
        model.addAttribute("ad", new Ad());
        return "ad/form";
    }

    @PostMapping("/create")
    public String create(@ModelAttribute Ad ad) {
        adService.create(ad);
        return "redirect:/ad/list";
    }

    @GetMapping("/edit/{id}")
    public String editForm(@PathVariable("id") Long id, Model model) {
        Ad ad = adService.getById(id);
        model.addAttribute("ad", ad);
        return "ad/form";
    }

    @PostMapping("/edit/{id}")
    public String edit(@PathVariable("id") Long id, @ModelAttribute Ad ad) {
        adService.update(id, ad);
        return "redirect:/ad/list";
    }

    @GetMapping("/delete/{id}")
    public String delete(@PathVariable("id") Long id) {
        adService.delete(id);
        return "redirect:/ad/list";
    }

}