地铁查询系统

public List<List<String>> getAllSubwayStations() {
    // 创建一个用于存储站点的 Map
    Map<Integer, List<String>> subwayStationsMap = new HashMap<>();

    // 查询数据库中所有的站点，并按照站点 ID 从小到大排序
    List<Station> allStations = stationService.list();
    Collections.sort(allStations, Comparator.comparing(Station::getStationID));

    // 遍历所有的站点，按照地铁线路号将站点添加到相应的列表中
    for (Station station : allStations) {
        Integer lineNumber = station.getLineNumber();
        String stationName = station.getStationName();

        List<String> stationList = subwayStationsMap.getOrDefault(lineNumber, new ArrayList<>());
        stationList.add(stationName);
        subwayStationsMap.put(lineNumber, stationList);
    }

    // 将所有线路的站点列表放入一个 List<List<String>> 中，并按照地铁线路号进行排序
    List<List<String>> allSubwayStations = new ArrayList<>();
    for (Map.Entry<Integer, List<String>> entry : subwayStationsMap.entrySet()) {
        allSubwayStations.add(entry.getValue());
    }
    return allSubwayStations;
}

@PostMapping("getstation")
public Result  getStation(@RequestBody QueryParam query){
    HashMap param = query.getParam();
    String startStation = (String) param.get("startStation");
    String endStation = (String) param.get("endStation");
    System.out.println(startStation);
    System.out.println(endStation);
    List<List<String>> allSubwayStations = getAllSubwayStations();
    Subway subway = new Subway();
    List<String> stationsBetween = subway.getStationsBetween(startStation,endStation, allSubwayStations);
    List<Station> stations = new ArrayList<>();
    for(String s : stationsBetween){
        LambdaQueryWrapper<Station> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(Station::getStationName,s);
        List<Station> station = stationService.list(lambdaQueryWrapper);
        stations.add(station.get(0));
    }

    System.out.println("Stations between A and G: " + stationsBetween);
    return Result.suc(stations);
}