我有一個(gè)@RestController如下。該方法getTrain(long)應(yīng)該為 URL 獲取，http://localhost:8080/trains/1但它正在獲取getTrains(). 其他 URL 按預(yù)期工作正常。我不確定我是否遺漏或不理解某些東西。我還查看了Spring 請(qǐng)求映射到特定路徑變量值的不同方法 ，它有所幫助。要求： 1. /trains [POST] - 添加火車 2. /trains [GET] - 獲取所有火車 3. /trains/{trainId} - 通過 id 獲取火車@RestControllerpublic class TrainController {    @Autowired    private TrainService trainService;    @RequestMapping(headers = { "Accept=application/json" }, method = RequestMethod.POST)    public TrainDto addTrain(@RequestBody TrainDto trainDto) throws Exception {        return trainService.addTrain(trainDto);    }    @RequestMapping(method = RequestMethod.GET)    public List<TrainDto> getTrains() throws Exception {        return trainService.getTrains();    }    @RequestMapping(value = "{trainId:\\d+}", method = RequestMethod.GET)    public TrainDto getTrain(@PathVariable("trainId") long trainId) throws Exception {        return trainService.getTrain(trainId);    }}