28.二级联动Controller最终版

@Controller
@RequestMapping("json3")
public class LinkageJSON3Controller {
    //获取省份
    @RequestMapping(value="province",produces="application/json;charset=utf-8")
    @ResponseBody
    public List<Province> getProvince(HttpServletResponse response) throws Exception {
        return Province.getAllProvince();
    }

    //获取城市
    @RequestMapping(value="city",produces="application/json;charset=utf-8")
    @ResponseBody
    public List<City> getCity(Long pId, HttpServletResponse response) throws Exception {
        return City.getCityByProvinceId(pId);
    }
}