Spring Boot 如何将Optional lt;gt;传递给实体类
根据您的错误，您Optional<RoomEntity>从存储库的findAll方法获取数据并将其转换为RoomEntity。
而不是RoomEntity roomEntity = roomrepository.findById(roomId);这样做
Optional<RoomEntity> optinalEntity = roomrepository.findById(roomId); RoomEntity roomEntity = optionalEntity.get();
我目前正在使用Spring创建一个网站，但偶然发现了这种基本情况，我对如何解决此特定代码一无所知：Entity = Optional;
RoomEntity roomEntity = roomRepository.findById(roomId);
ReservationResource（API请求类）：
public class ReservationResource {
@Autowired
RoomRepository roomRepository;
@RequestMapping(path = "/{roomId}",method = RequestMethod.GET,produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResponseEntity<RoomEntity> getRoomById(
@PathVariable
Long roomId){
RoomEntity roomEntity = roomRepository.findById(roomId);
return new ResponseEntity<>(roomEntity,HttpStatus.OK);}
}}
RoomRepository类：
public interface RoomRepository extends CrudRepository<RoomEntity,Long> {
List<RoomEntity> findAllById(Long id);
}
房间实体
@Entity
@Table(name = "Room")
public class RoomEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
private Integer roomNumber;
@NotNull
private String price;
public RoomEntity() {
super();
}
}
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