maven构建SSM工程[应用]4

5.Service层

5.1创建接口
public interface ItemsService {
    public Items findById(Integer id);
}

 5.2实现这里使用的是注解加配置文件的方式,最后把注解一起写下来

@Service
@Transactional
public class ItemsServiceImpl implements ItemsService {
    @Autowired
    private ItemsDao itemsDao;

    public Items findById(Integer id) {
        return itemsDao.findById(id);
    }
}
6.web层

@Controller
@RequestMapping("/items")
public class ItemsController {
    @Autowired
    private ItemsService itemsService;

    @RequestMapping("/showDetail")
    public  String showDetail(Model model){
        Items items = itemsService.findById(1);
        model.addAttribute("item",items);
        return "itemDetail";
    }
}