为Path变量的其他URL选择了默认请求映射方法

Question

我在下面有一个@RestController如下。 getTrain(long)的方法应该被用于网站http://localhost:8080/trains/1，而是拿起getTrains()。其他URL按预期正常工作。我不确定我是否缺少或不了解某些事情。我也看了Spring request mapping to a different method for a particular path variable value ，它有点帮助。

要求：1。/火车[POST] - 添加火车2. /火车[GET] - 获取所有火车3. / train / {trainId} - 通过id获取火车

@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

您应该为映射请求添加value =“”。看看这是否有效

@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);
    }

}

或者你可以这样做。

@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);
    }
}

这会奏效。花括号内的值，即trainId应该映射到PathVariable。