关于API和JSON序列化，我是一个初学者。我遇到一个奇怪的输出。看来我的JSON输出格式错误？我正在使用Spring Boot 1.59，当我在邮递员中检查我的结果时，出现以下错误：
/**
*
* @return
*/
@PostMapping(value = "/getUser")
@ResponseBody
public User getUSer(@RequestParam int userID) {
System.out.println("Request Id is---->"+userID);
User user = userRepository.findById(userID);
return user;
}
@Entity
@Table(name = "users")
public class User implements Serializable {
@Id
//@GeneratedValue(strategy = GenerationType.IDENTITY)
@GeneratedValue(strategy= GenerationType.AUTO)
private Long id;
@NotNull
@Size(max = 65)
@Column(name = "first_name")
private String firstName;
@Size(max = 65)
@Column(name = "last_name")
private String lastName;
@NotNull
@Email
@Size(max = 100)
@Column(unique = true)
private String email;
@NotNull
@Size(max = 128)
private String password;
@OneToOne(fetch = FetchType.LAZY,
cascade = CascadeType.ALL,
mappedBy = "user")
private UserProfile userProfile;
// Hibernate requires a no-arg constructor
public User() {
}
public User(String firstName, String lastName, String email, String password) {
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
this.password = password;
}
// Getters and Setters (Omitted for brevity)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public UserProfile getUserProfile() {
return userProfile;
}
public void setUserProfile(UserProfile userProfile) {
this.userProfile = userProfile;
}
}
@Entity
@Table(name = "user_profiles")
public class UserProfile implements Serializable{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "phone_number")
@Size(max = 15)
private String phoneNumber;
@Enumerated(EnumType.STRING)
@Column(length = 10)
private Gender gender;
@Temporal(TemporalType.DATE)
@Column(name = "dob")
private Date dateOfBirth;
@Size(max = 100)
private String address1;
@Size(max = 100)
private String address2;
@Size(max = 100)
private String street;
@Size(max = 100)
private String city;
@Size(max = 100)
private String state;
@Size(max = 100)
private String country;
@Column(name = "zip_code")
@Size(max = 32)
private String zipCode;
@OneToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "user_id", nullable = false)
private User user;
public UserProfile() {
}
public UserProfile(String phoneNumber, Gender gender, Date dateOfBirth,
String address1, String address2, String street, String city,
String state, String country, String zipCode) {
this.phoneNumber = phoneNumber;
this.gender = gender;
this.dateOfBirth = dateOfBirth;
this.address1 = address1;
this.address2 = address2;
this.street = street;
this.city = city;
this.state = state;
this.country = country;
this.zipCode = zipCode;
}
// Getters and Setters (Omitted for brevity)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
public Gender getGender() {
return gender;
}
public void setGender(Gender gender) {
this.gender = gender;
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
public String getAddress1() {
return address1;
}
public void setAddress1(String address1) {
this.address1 = address1;
}
public String getAddress2() {
return address2;
}
public void setAddress2(String address2) {
this.address2 = address2;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getZipCode() {
return zipCode;
}
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
public interface UserRepository extends JpaRepository<User, Long> {
User findById(int id);
}
还有关于fastxml.jackson错误的大量长堆栈跟踪：
[jackson-databind-2.6.6.jar:2.6.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693) ~[jackson-databind-2.6.6.jar:2.6.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675) ~[jackson-databind-2.6.6.jar:2.6.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157) ~[jackson-databind-2.6.6.jar:2.6.6]
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149) ~[jackson-databind-2.6.6.jar:2.6.6]
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:111) ~[jackson-databind-2.6.6.jar:2.6.6]
at
答案 0 :(得分：0)
由于两个实体之间的无限递归而发生，我使用 JsonManagedReference ， JsonBackReference
解决了