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import java.util.List;

public interface ActivityRemarkService {
    List<ActivityRemark> queryActivityRemarkForDetailByActivityId(String activityId);
} 
import java.util.List;

@Service("activityRemarkService")
public class ActivityRemarkServiceImpl implements ActivityRemarkService {

    @Autowired
    //调用mapper层
    private ActivityRemarkMapper activityRemarkMapper;

    @Override
    public List<ActivityRemark> queryActivityRemarkForDetailByActivityId(String activityId) {
        return activityRemarkMapper.selectActivityRemarkForDetailByActivityId(activityId);
    }
} 

@Controller
public class ActivityController {

    @Autowired
    private UserService userService;

    @Autowired
    private ActivityService activityService;
用service的数据
    @Autowired
    private ActivityRemarkService activityRemarkService; 

    @RequestMapping("/workbench/activity/detailActivity.do")
    public String detailActivity(String id,HttpServletRequest request){
        //调用service层方法，查询数据
        Activity activity=activityService.queryActivityForDetailById(id);
        List<ActivityRemark> remarkList=activityRemarkService.queryActivityRemarkForDetailByActivityId(id);
        //把数据保存到request中
        request.setAttribute("activity",activity);
        request.setAttribute("remarkList",remarkList);
        //请求转发
        return "workbench/activity/detail";
    }
} 
]