fix: 站点列表改为先全量排序后内存分页，修复跨页距离错乱；过滤已下线站点；分页参数上限50防全表拉取

service/src/main/java/com/kym/service/admin/impl/StationServiceImpl.java

@@ -202,39 +202,55 @@ public class StationServiceImpl extends MyBaseServiceImpl<StationMapper, Station
     @Override
 //    @DynamicCache  有参接口有bug,例如搜索接口，会缓存历史搜索的结果返回，与预期不符
     public PageBean<SimpleStationVo> listStationForApp(StationQueryParam params) {
-        PageHelper.startPage(params.getPageNum(), params.getPageSize());
-        // 站点列表
-        LambdaQueryWrapper<Station> queryWrapper = new LambdaQueryWrapper<>();
-        queryWrapper.select(Station::getStationId, Station::getStationName, Station::getAddress, Station::getLocation,
-                Station::getStationStatus, Station::getParkingNum, Station::getElectricityFee, Station::getServiceFee, Station::getParkFee);
-        queryWrapper.in(CommUtil.isNotEmptyAndNull(params.getStationIdList()), Station::getStationId, params.getStationIdList());
-        var stationVoList = list(queryWrapper).stream()
-                .map(station -> buildSimpleStationVo(station, params))
-                .collect(Collectors.toCollection(ArrayList::new));
-        // 按照距离由近到远排序
-        stationVoList.sort(Comparator.comparing(SimpleStationVo::getDistance));
+        var stationVoList = listSortedStations(params);
+        var page = pageOf(stationVoList, params);
         // 计算并填充站点空闲数量
-        fillAvailableParkingNum(stationVoList);
+        fillAvailableParkingNum(page.getList());
         // 填充站点活动信息
-        fillActivityList(stationVoList);
-        return new PageBean<>(stationVoList);
+        fillActivityList(page.getList());
+        return page;
     }
 
     @Override
     public PageBean<SimpleStationVo> listStationForMap(StationQueryParam params) {
-        PageHelper.startPage(params.getPageNum(), params.getPageSize());
-        // 站点列表（仅查询地图展示所需的基础字段）
+        // 不查询枪统计与活动信息，由前端点击站点时通过 listStationCard 按需查询
+        return pageOf(listSortedStations(params), params);
+    }
+
+    /**
+     * 全量查询未下线站点并按距离由近到远排序（先排序后分页，保证跨页距离有序）
+     */
+    private List<SimpleStationVo> listSortedStations(StationQueryParam params) {
+        // 站点列表（仅查询展示所需的基础字段）
         LambdaQueryWrapper<Station> queryWrapper = new LambdaQueryWrapper<>();
         queryWrapper.select(Station::getStationId, Station::getStationName, Station::getAddress, Station::getLocation,
                 Station::getStationStatus, Station::getParkingNum, Station::getElectricityFee, Station::getServiceFee, Station::getParkFee);
         queryWrapper.in(CommUtil.isNotEmptyAndNull(params.getStationIdList()), Station::getStationId, params.getStationIdList());
-        var stationVoList = list(queryWrapper).stream()
+        // 过滤已下线站点
+        queryWrapper.ne(Station::getStationStatus, Station.STATION_STATUS_关闭下线);
+        return list(queryWrapper).stream()
                 .map(station -> buildSimpleStationVo(station, params))
+                .sorted(Comparator.comparing(SimpleStationVo::getDistance))
                 .collect(Collectors.toCollection(ArrayList::new));
-        // 按照距离由近到远排序
-        stationVoList.sort(Comparator.comparing(SimpleStationVo::getDistance));
-        // 不查询枪统计与活动信息，由前端点击站点时通过 listStationCard 按需查询
-        return new PageBean<>(stationVoList);
+    }
+
+    /**
+     * 内存分页：站点数量有限，全量排序后截取当前页；分页参数加上限，防止一次拉取全表
+     */
+    private PageBean<SimpleStationVo> pageOf(List<SimpleStationVo> stationVoList, StationQueryParam params) {
+        int pageNum = Math.max(params.getPageNum(), 1);
+        int pageSize = Math.min(Math.max(params.getPageSize(), 1), 50);
+        int from = (pageNum - 1) * pageSize;
+        List<SimpleStationVo> pageList = from >= stationVoList.size()
+                ? List.of()
+                : new ArrayList<>(stationVoList.subList(from, Math.min(from + pageSize, stationVoList.size())));
+        var pageBean = new PageBean<>(pageList);
+        pageBean.setTotal(stationVoList.size());
+        pageBean.setPageNum(pageNum);
+        pageBean.setPageSize(pageSize);
+        pageBean.setSize(pageList.size());
+        pageBean.setPages(pageSize > 0 ? (stationVoList.size() + pageSize - 1) / pageSize : 0);
+        return pageBean;
     }
 
     @Override