将嵌套实体插入spring boot(POST)的基本JSON

Question

所以我是spring boot的新手，我遇到了一个小问题，我需要通过POST调用保存2个对象实体。问题是在Object中保存一个嵌套的对象数组。

JSON：

{ 
 "id": "100", 
 "department": "marand", 
 "patients": { 
 "patient": [ 
 { 
 "id": "1", 
 "first_name": "John", 
 "last_name": "Smith", 
 "diseases": { 
 "disease": [ 
 "nice_to_people", 
 "long_legs" 
 ] 
 } 
 }, 
 { 
 "id": "2", 
 "first_name": "Jenny", 
 "last_name": "Cox", 
 "diseases": { 
 "disease": [ 
 "used_to_have_dredds", 
 "nice_to_people" 
 ] 
 } 
 }, 
 { 
 "id": "3", 
 "first_name": "Martin", 
 "last_name": "Lewis", 
 "diseases": { 
 "disease": [ 
 "chocaholic", 
 "great_haircut" 
 ] 
 } 
 } 
 ] 
 } 
 } 

我有两个实体Doctor和Patient具有类构造函数：

没有吸气器和设置器的医生：

@Entity
@Table(name = "doktors")
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class Doktor implements Serializable {
    private static final long serialversionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    @Column(name = "department")
    private String department;

    @Autowired
    @OneToMany(mappedBy = "doktor",cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<Patient> patients;

和不带吸气器和设置器的病人：

@Entity
@Table(name = "patient")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Patient  implements Serializable {
        private static final long serialversionUID = 1L;

        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;

        @Column(name = "first_name")
        private String first_name;

        @Column(name = "last_name")
        private String last_name;



        @ManyToOne(fetch = FetchType.LAZY, optional = false)
        @JoinColumn(name = "doktor_id",nullable = false)
        @JsonIgnore
        private Doktor doktor;

       @ManyToMany(cascade = CascadeType.ALL)
        @JoinTable(name = "patient_disease", joinColumns = @JoinColumn(name = "patient_id",referencedColumnName = "id"),
               inverseJoinColumns = @JoinColumn(name = "disease_id",referencedColumnName = "id") )
        private List<disease> diseases; 

因此，当我将JSON插入POST调用时，我得到以下错误：{“Timestamp”：1613060297379,“Status”：400,“Error”：“Bad Request”，“Message”：“JSON parse Error：无法反序列化java.util.ArrayList 实例脱离START_OBJECT令牌；嵌套异常为com.fasterxml.jackson.databind.exc.MismatchedInputException：无法反序列化java.util.ArrayList




Answer 1

您的类不支持JSON。“病人”字段应该从“病人”中去掉。“病人”字段应该是这样的：

“患者”：[{“id”：“1”,“first_name”：“John”,“last_name”：“Smith”,“疾病”：{“疾病”：[“nice_to_people”,“long_legs”]}},{“id”：“2”,“first_name”：“jenny”,“last_name”：“Cox”,“疾病”：{“疾病”：[“used_to_have_dredds”,“nice_to_people”]}},{“id”：“3”,“first_name”：“Martin”,“last_name”：“Lewis”,