后台集合分页

public ApiResult getState(@FormParam("deviceType") int deviceType, @FormParam("precinctId") String precinctId,
                              @FormParam("deviceName") String deviceName, @FormParam("onLine") String onLine,
                              @FormParam("pageNo") int pageNo, @FormParam("pageSize") int pageSize) {
        //根据条件获取到的集合
        List<DeviceStatePojoVo> state = deviceMonitorService.getState(deviceType, precinctId, deviceName, onLine);
        List<DeviceStatePojoVo> stateList = null;
        int length = state.size();
        if (length > 0) {
            //默认
            int startIndex = 0;
            int endIndex = 10;
            int no = 1;
            int size = 10;
            if (pageSize > 0 && pageSize <= length) {
                size = pageSize;
            }
            int pages = length / size;
            if (length > pages * size) {
                pages += 1;   //页数
            }
            if (pageNo > 0 && pageNo <= pages) {
                no = pageNo;
            } else {
                no = 1;
            }
            startIndex = (no - 1) * size;
            endIndex = no * size;
            if (endIndex > length) {//防止下标越界
                endIndex = length;
            }
            stateList = state.subList(startIndex, endIndex);  //两个值都是下标
        }
        PageUtil pageUtil = new PageUtil(state.size(), stateList);
        return new ApiResult(ApiCode.SUCCESS, pageUtil);
    }