我正在使用 Spring Boot 测试 Neo4j,当我尝试使用 Rest API 插入元素时发现以下问题,我收到无法将 JSON 序列化为实体的错误。如果有人可以帮助我或解释如何更改我的代码或如何序列化该实体,我将非常感激。我的课程是......用户实体
@NodeEntity
public class User extends AbstractEntity{
@Id
@GeneratedValue
private Long id;
private String firstname, lastname;
@NotNull @NotBlank @Email
@Index(unique = true)
private String email;
@Index(unique = true)
private String phone;
@Relationship(type = "ADDRESS")
private Set<Address> addresses = new HashSet<>();
public User() {
}
//get & set & const....
}
地址实体
@NodeEntity
public class Address extends AbstractEntity{
/*Update the OMG [https://neo4j.com/developer/neo4j-ogm] and remove de id.
Keep the id in AbstractEntity*/
@Id
@GeneratedValue
private Long id;
private String street, city;
@Relationship(type = "COUNTRY")
private Country country;
public Address(String street, String city, Country country) {
this.street = street;
this.city = city;
this.country = country;
}
public Address() {
}
//get & set & const...
}
国家实体
@NodeEntity
public class Country extends AbstractEntity {
/*Update the OMG [https://neo4j.com/developer/neo4j-ogm] and remove de id.
Keep the id in AbstractEntity*/
@Id
@GeneratedValue
private Long id;
@Index(unique=true)
private String code;
private String name;
public Country(String code, String name) {
this.code = code;
this.name = name;
}
public Country() {
}
}
抽象实体
@EnableNeo4jAuditing
public abstract class AbstractEntity {
public abstract Long getId();
@Transient
private SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
private Date created = new Date();
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (getId() == null || obj == null || !getClass().equals(obj.getClass())) {
return false;
}
return getId().equals(((AbstractEntity) obj).getId());
}
@Override
public int hashCode() {
return getId() == null ? 0 : getId().hashCode();
}
}
我的商店用户的简单存储库类
public interface UserRepository extends Neo4jRepository<User, Long> {
User findByFirstname(String name);
@Override
void delete(User deleted);
}
我的服务类
@Service
public class UserService {
private UserRepository userRepository;
@Autowired
public UserService(UserRepository userRepository) {
this.userRepository = userRepository;
}
public Iterable<User> contact() {
return userRepository.findAll();
}
public User save(User user) {
userRepository.save(user);
return user;
}
public User show(Long id) {
return userRepository.findById(id).get();
}
public User update(Long id, User user) {
User c = userRepository.findById(id).get();
if(user.getFirstname()!=null && !user.getFirstname().trim().isEmpty())
c.setFirstname(user.getFirstname().trim());
if(user.getLastname()!=null && !user.getLastname().trim().isEmpty())
c.setLastname(user.getLastname().trim());
if(user.getEmail()!=null && !user.getEmail().trim().isEmpty())
c.setEmail(user.getEmail().trim());
userRepository.save(c);
return user;
}
public String delete(Long id) {
User user = userRepository.findById(id).get();
userRepository.delete(user);
return "";
}
}
我的控制器类
@RestController
public class UserController {
@Autowired
UserService userService;
@RequestMapping(method = RequestMethod.GET, value = "/users")
public Iterable<User> user() {
return userService.contact();
}
@RequestMapping(method = RequestMethod.POST, value = "/users")
public String save(@RequestBody User user) {
try {
userService.save(user);
}catch (org.neo4j.driver.v1.exceptions.ClientException ex){
System.err.println("******||||||||||||[{ The User exist with the same email }]||||||||||||******");
return "The User exist with the same email";
}
return user.toString();
}
@RequestMapping(method=RequestMethod.GET, value="/users/{id}")
public User show(@PathVariable Long id) {
try{
return userService.show(id);}
catch (java.util.NoSuchElementException ex){
System.err.println("******||||||||||||[{ The User do not exist }]||||||||||||******");
}
return null;
}
@RequestMapping(method=RequestMethod.PUT, value="/users/{id}")
public User update(@PathVariable Long id, @RequestBody User user) {
return userService.update(id, user);
}
@RequestMapping(method=RequestMethod.DELETE, value="/users/{id}")
public String delete(@PathVariable Long id) {
return userService.delete(id);
}
}
这是我尝试建模的简单方案(Neo4j 是一个 NoSQL 数据库,没有大纲,但我尝试建模一个简单的应用程序) 在此处输入图像描述
当它尝试测试 api rest 的方法时,它对我有用,但 Country 实体未序列化为 json。
我已经将数据插入到数据库中,我使用测试方法声明了对象并使用方法保存它。当我使用 json 格式时会出现问题。当我运行 curl 命令测试 Rest API 时,它不返回国家/地区
$ curl -i -H "Accept: application/json" localhost:8088/users/1
HTTP/1.1 200
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 27 Sep 2018 20:38:31 GMT
{"created":"2018-09-27T19:55:21.578+0000","id":1,"firstname":"Yuniel","lastname":"Acosta Pérez","email":"yuniel.acosta@someserver.com","phone":"+999999999999","addresses":[{"created":"2018-09-27T19:55:21.578+0000","id":0,"street":"Some Stree","city":"Some City","country":null}]}
如您所见,国家将其作为空值返回,如果它存在于数据库中。
当我尝试使用 API 插入一个元素时,它感叹一个错误,即我无法将国家对象序列化为 JSON。
$ curl -i -X POST -H "Content-Type: application/json" -d '{"firstname":"Yuniel","lastname":"Acosta Pérez","email":"yuniel.acosta@someserver.com","phone":"+999999999999","addresses":[{"street":"Some Stree","city":"Some City","country":[{"code":"OO","name":"ANYCOUNTRY"}]}]}' localhost:8088/users
下一个错误是抛出我的那个
{"timestamp":"2018-09-27T21:07:56.365+0000","status":400,"error":"Bad Request","message":"JSON 解析错误:无法反序列com.syskayzen.hypercube.domain.Address
化 START_ARRAY 的实例令牌;嵌套异常是 com.fasterxml.jackson.databind.exc.MismatchedInputException:无法com.syskayzen.hypercube.domain.Address
在 [Source: (PushbackInputStream); line: 1, column: 122] 处反序列化 START_ARRAY token\n 之外的实例(通过引用链:com. syskayzen.hypercube.domain.User[\"addresses\"])","path":"/users"}
如果您能告诉我如何解决如何序列化国家实体的问题,或者是否是由于其他原因导致错误。
我正在使用 Spring Boot 2.0.5 和 Spring Data Neo4j