写一个基于springboot实现客房入住情况进行登记、查询及续房操作代码片段

以下是基于springboot实现客房入住情况登记、查询及续房操作的代码片段：

1. 实体类

@Entity
public class Room {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String roomNumber;
    private String status; // 客房状态：空闲、已预订、已入住
    private Date checkInDate; // 入住时间
    private Date checkOutDate; // 离店时间
    // 省略getter/setter方法
}

2. 数据库操作接口

@Repository
public interface RoomRepository extends JpaRepository<Room, Long> {
    List<Room> findByStatus(String status); // 查询指定状态的客房
    Room findByRoomNumber(String roomNumber); // 根据客房号查询客房
}

3. 服务层

@Service
public class RoomService {
    @Autowired
    private RoomRepository roomRepository;

    // 登记客房入住
    public Room checkIn(String roomNumber) {
        Room room = roomRepository.findByRoomNumber(roomNumber);
        if (room == null || !"空闲".equals(room.getStatus())) {
            // 客房不存在或已被预订或已入住
            return null;
        }
        room.setStatus("已入住");
        room.setCheckInDate(new Date());
        room.setCheckOutDate(null);
        return roomRepository.save(room);
    }

    // 查询空闲客房
    public List<Room> findFreeRooms() {
        return roomRepository.findByStatus("空闲");
    }

    // 查询已入住客房
    public List<Room> findCheckedInRooms() {
        return roomRepository.findByStatus("已入住");
    }

    // 续房
    public Room renew(String roomNumber, int days) {
        Room room = roomRepository.findByRoomNumber(roomNumber);
        if (room == null || !"已入住".equals(room.getStatus())) {
            // 客房不存在或不是已入住状态
            return null;
        }
        room.setCheckOutDate(DateUtils.addDays(room.getCheckOutDate(), days));
        return roomRepository.save(room);
    }
}

4. 控制层

@RestController
@RequestMapping("/room")
public class RoomController {
    @Autowired
    private RoomService roomService;

    // 登记客房入住
    @PostMapping("/checkin")
    public ResponseEntity checkIn(@RequestParam String roomNumber) {
        Room room = roomService.checkIn(roomNumber);
        if (room == null) {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("客房不可用");
        }
        return ResponseEntity.ok(room);
    }

    // 查询空闲客房
    @GetMapping("/free")
    public ResponseEntity findFreeRooms() {
        List<Room> rooms = roomService.findFreeRooms();
        return ResponseEntity.ok(rooms);
    }

    // 查询已入住客房
    @GetMapping("/checkedin")
    public ResponseEntity findCheckedInRooms() {
        List<Room> rooms = roomService.findCheckedInRooms();
        return ResponseEntity.ok(rooms);
    }

    // 续房
    @PostMapping("/renew")
    public ResponseEntity renew(@RequestParam String roomNumber, @RequestParam int days) {
        Room room = roomService.renew(roomNumber, days);
        if (room == null) {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("客房不可用");
        }
        return ResponseEntity.ok(room);
    }
}