我遇到了问题,即JSON不包含嵌套对象列表。无法获取JSON中的嵌套对象列表
我有2个类,其中一个是携带有关汽车服务的信息,另一个是关于服务的信息。
一个autoservice可以有很多服务。所以,我们有这种关系 - 一对多。
AutoService
类:
@Entity
@Table(name = "AutoRate")
public class AutoService {
public AutoService() {
}
@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
private long id;
@Column(name = "serviceName", nullable = false)
private String serviceName;
@Column(name = "imageURL", nullable = false)
private String imageURL;
@Column(name = "mapCoordinate", nullable = false)
private String mapCoordinate;
@Column(name = "websiteURL", nullable = false)
private String websiteURL;
@Column(name = "phoneNumber", nullable = false)
private String phoneNumber;
@OneToMany(fetch = FetchType.EAGER)
@JoinColumn(name = "autoServiceId")
private List<Service> services;
public long getId() {
return id;
}
public String getServiceName() {
return serviceName;
}
public String getImageURL() {
return imageURL;
}
public String getMapCoordinate() {
return mapCoordinate;
}
public String getWebsiteURL() {
return websiteURL;
}
public String getPhoneNumber() {
return phoneNumber;
}
}
Service
类:
@Entity
@Table(name = "Service")
public class Service {
public Service() {
}
@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
@Column(name = "serviceId", unique = true, nullable = false)
private long serviceId;
@Column(name = "serviceName", nullable = false)
private String serviceName;
@Column(name = "category", nullable = false)
private String category;
@Column(name = "price", nullable = false)
private int price;
@Column(name = "autoServiceId", nullable = false)
private long autoServiceId;
public long getId() {
return serviceId;
}
public String getCategory() {
return category;
}
public int getPrice() {
return price;
}
public String getServiceName() {
return serviceName;
}
public long getAutoServiceId() {
return autoServiceId;
}
}
此外,我现在用的是JpaRepository
获得从数据库对象:
public interface AutoRateRepository extends JpaRepository<AutoService, Long> {
}
这里是Controller
类:
@RestController
@RequestMapping("/directory")
public class ServiceController {
@Autowired
private AutoRateService dataBaseService;
@RequestMapping(value = "/get", method = RequestMethod.GET)
@ResponseBody
public List<AutoService> getData(){
List<AutoService> dataList = dataBaseService.getAll();
return dataList;
}
}
但后来当我试图让JSON对象我得到下一个:
[
{
"id": 1,
"serviceName": "SpeedyName",
"imageURL": "Url for speedy",
"mapCoordinate": "123123 44121 ",
"websiteURL": "speedy.com",
"phoneNumber": "1231251"
},
{
"id": 2,
"serviceName": "Другой сервис",
"imageURL": "Урл для второго сервиса",
"mapCoordinate": "123 12фывфы",
"websiteURL": "другойсервис.ком",
"phoneNumber": "12312333"
}
]
没有从数据库中嵌套对象的列表(List<Services>
你能帮我解决这个问题?
有人告诉我,我已经错过了@JsonManagedReference注解,但它并没有帮我(
将公共列表 getServices(){...}方法添加到您的AutoService类 –