在Spring中返回列表的正確方法是什么

Question

我寫了一個用Spring注釋的方法，它將返回一個列表。 以下代碼片段將表示該方法。

   @RequestMapping(path = "", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<ReservationResponse> getAvailableRooms(
            @RequestParam(name = "checkin")
            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
            LocalDate checkin,
            @RequestParam(name = "checkout")
            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
            LocalDate checkout) {

        return new ResponseEntity<>(new ReservationResponse(), HttpStatus.OK);
    }

我想知道的是，如果我寫它，那會錯嗎？

@RequestMapping(path = "", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResponseEntity<ReservationResponse> getAvailableRooms(
        @RequestParam(name = "checkin")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkin,
        @RequestParam(name = "checkout")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkout) {
        ResponseEntity<ReservationResponse> reservationResponse = new ResponseEntity<ReservationResponse>();
    return (reservationResponse, HttpStatus.OK);
    }

Answer 1

我認為您的ReservationResponse包含這樣的列表：

class ReservationResponse{
List<Rooms> availableRooms;
}

如果這樣，那么您只需返回ReservationResponse即可，無需添加任何內容。

@RequestMapping(path = "", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
@ResponseBody
public ReservationResponse getAvailableRooms(
        @RequestParam(name = "checkin")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkin,
        @RequestParam(name = "checkout")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkout) {
        ReservationResponse> reservationResponse = new ReservationResponse();
        List<Rooms> rooms = yourService.getAvailableRooms(checkIn,checkOut);
        reservationResponse.setAvailableRooms(rooms);
    return reservationResponse;
    }

或者你可以像這樣簡單地返回房間

@RequestMapping(path = "", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
@ResponseBody
public List<Rooms> getAvailableRooms(
        @RequestParam(name = "checkin")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkin,
        @RequestParam(name = "checkout")
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
        LocalDate checkout) {

        List<Rooms> rooms = yourService.getAvailableRooms(checkIn,checkOut);

    return rooms;
    }