使用Path變量為其他URL選擇默認請求映射方法

Question

我在下面有一個@RestController如下所示。 應該為URL http://localhost:8080/trains/1選取方法getTrain(long) ，但是要選取getTrains() 。 其他URL可以正常工作。 我不確定我是否想念還是不明白。 我還研究了針對特定路徑變量值將Spring請求映射到其他方法的方法 ，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

@RestController
public 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);
    }
}

Answer 1

您應該在映射請求中添加value =“” 。 看看是否可行

@RestController public class TrainController {

    @Autowired
    private TrainService trainService;

    @RequestMapping(value = "/trains",headers = { "Accept=application/json" }, method = RequestMethod.POST)
    public TrainDto addTrain(@RequestBody TrainDto trainDto) throws Exception {

        return trainService.addTrain(trainDto);
    }

    @RequestMapping(value = "/trains",method = RequestMethod.GET)
    public List<TrainDto> getTrains() throws Exception {

        return trainService.getTrains();
    }

    @RequestMapping(value = "/trains/{trainId}", method = RequestMethod.GET)
    public TrainDto getTrain(@PathVariable("trainId") long trainId) throws Exception {

        return trainService.getTrain(trainId);
    }

}

或者，您可以采用這種方式。

@RestController
@RequestMapping(TrainController.REQUEST_MAPPING_URL)
public class TrainController {

       public static final String REQUEST_MAPPING_URL = "/trains";

        @Autowired
        private TrainService trainService;

        @RequestMapping(value = "/",headers = { "Accept=application/json" }, method = RequestMethod.POST)
        public TrainDto addTrain(@RequestBody TrainDto trainDto) throws Exception {
            return trainService.addTrain(trainDto);
        }

        @RequestMapping(value = "/",method = RequestMethod.GET)
        public List<TrainDto> getTrains() throws Exception {
            return trainService.getTrains();
        }

        @RequestMapping(value = "/{trainId}", method = RequestMethod.GET)
        public TrainDto getTrain(@PathVariable("trainId") long trainId) throws Exception {
            return trainService.getTrain(trainId);
        }

    }

Answer 2

@RestController
public 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}", method = RequestMethod.GET)
    public TrainDto getTrain(@PathVariable("trainId") long trainId) throws Exception {

        return trainService.getTrain(trainId);
    }
}

這會起作用。 花括號內的值，即trainId應該映射到PathVariable。