Question

有一个奇怪的问题，无法弄清楚如何处理它。有简单的POJO：

@Entity
@Table(name = "persons")
public class Person {

    @Id
    @GeneratedValue
    private Long id;

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

    @Column(name = "middle_name")
    private String middleName;

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

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

    @Column(name = "created")
    private Date created;

    @Column(name = "updated")
    private Date updated;

    @PrePersist
    protected void onCreate() {
        created = new Date();
    }

    @PreUpdate
    protected void onUpdate() {
        updated = new Date();
    }

    @Valid
    @OrderBy("id")
    @OneToMany(mappedBy = "person", fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
    private List<PhoneNumber> phoneNumbers = new ArrayList<>();

    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 getMiddleName() {
        return middleName;
    }

    public void setMiddleName(String middleName) {
        this.middleName = middleName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public Date getCreated() {
        return created;
    }

    public Date getUpdated() {
        return updated;
    }

    public List<PhoneNumber> getPhoneNumbers() {
        return phoneNumbers;
    }

    public void addPhoneNumber(PhoneNumber number) {
        number.setPerson(this);
        phoneNumbers.add(number);
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }
}

@Entity
@Table(name = "phone_numbers")
public class PhoneNumber {

    public PhoneNumber() {}

    public PhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    @Id
    @GeneratedValue
    private Long id;

    @Column(name = "phone_number")
    private String phoneNumber;

    @ManyToOne
    @JoinColumn(name = "person_id")
    private Person person;

    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 Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }
}

和休息终点：

@ResponseBody
@RequestMapping(method = RequestMethod.GET)
public List<Person> listPersons() {
    return personService.findAll();
}

在json响应中有除Id之外的所有字段，我需要在前端编辑/删除人。如何配置spring boot以序列化Id？

这就是现在的反应：

[{
  "firstName": "Just",
  "middleName": "Test",
  "lastName": "Name",
  "comment": "Just a comment",
  "created": 1405774380410,
  "updated": null,
  "phoneNumbers": [{
    "phoneNumber": "74575754757"
  }, {
    "phoneNumber": "575757547"
  }, {
    "phoneNumber": "57547547547"
  }]
}]

UPD具有双向hibernate映射，可能它与问题有某种关联。

Answer 1

我最近遇到了同样的问题，因为默认情况下spring-boot-starter-data-rest的工作原理是这样的。看我的问题 - ＆gt; While using Spring Data Rest after migrating an app to Spring Boot, I have observed that entity properties with @Id are no longer marshalled to JSON

要自定义其行为方式，您可以扩展RepositoryRestConfigurerAdapter以公开特定类的ID。

import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter;

@Configuration
public class RepositoryConfig extends RepositoryRestConfigurerAdapter {
    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        config.exposeIdsFor(Person.class);
    }
}

Answer 2

如果您需要公开所有实体的标识符：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;

import javax.persistence.EntityManager;
import javax.persistence.metamodel.Type;

@Configuration
public class RestConfiguration implements RepositoryRestConfigurer {

    @Autowired
    private EntityManager entityManager;

    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        config.exposeIdsFor(
                entityManager.getMetamodel().getEntities().stream()
                .map(Type::getJavaType)
                .toArray(Class[]::new));
    }
}

请注意，在2.1.0.RELEASE之前的Spring Boot版本中，您必须扩展（现已弃用） org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter，而不是直接实现RepositoryRestConfigurer。

如果您只想公开扩展的实体的标识符或实现特定超类或接口：

    ...
    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        config.exposeIdsFor(
                entityManager.getMetamodel().getEntities().stream()
                .map(Type::getJavaType)
                .filter(Identifiable.class::isAssignableFrom)
                .toArray(Class[]::new));
    }

如果您只想公开具有特定注释的实体的标识符：

    ...
    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        config.exposeIdsFor(
                entityManager.getMetamodel().getEntities().stream()
                .map(Type::getJavaType)
                .filter(c -> c.isAnnotationPresent(ExposeId.class))
                .toArray(Class[]::new));
    }

示例注释：

import java.lang.annotation.*;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ExposeId {}

Answer 3

来自@ eric-peladan的回答没有开箱即用，但非常接近，可能适用于以前版本的Spring Boot。现在这是应该如何配置，如果我错了，请纠正我：

import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter;

@Configuration
public class RepositoryConfiguration extends RepositoryRestConfigurerAdapter {

    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        config.exposeIdsFor(User.class);
        config.exposeIdsFor(Comment.class);
    }
}

Answer 4

使用Spring Boot，您必须扩展 SpringBootRepositoryRestMvcConfiguration
如果您使用 RepositoryRestMvcConfiguration ，则application.properties中的配置定义可能无法正常工作

@Configuration
public class MyConfiguration extends SpringBootRepositoryRestMvcConfiguration  {

@Override
protected void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
    config.exposeIdsFor(Project.class);
}
}

但是暂时需要您可以使用投影在序列化中包含 id ，如：

@Projection(name = "allparam", types = { Person.class })
public interface ProjectionPerson {
Integer getIdPerson();
String getFirstName();
String getLastName();

}

Answer 5

简单方法：将变量private Long id;重命名为private Long Id;

适合我。您可以阅读更多相关信息here

Answer 6

@Component
public class EntityExposingIdConfiguration extends RepositoryRestConfigurerAdapter {

    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
        try {
            Field exposeIdsFor = RepositoryRestConfiguration.class.getDeclaredField("exposeIdsFor");
            exposeIdsFor.setAccessible(true);
            ReflectionUtils.setField(exposeIdsFor, config, new ListAlwaysContains());
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }

    class ListAlwaysContains extends ArrayList {

        @Override
        public boolean contains(Object o) {
            return true;
        }
    }
}

Answer 7

嗯，好像我找到了解决方案。从pom文件中删除spring-boot-starter-data-rest并将@JsonManagedReference添加到phoneNumbers并将@JsonBackReference添加到person，以提供所需的输出。 Json作为回应不再打印，但现在它有Id。不知道什么神奇的春季靴子具有这种依赖性，但我不喜欢它。）

Answer 8

类RepositoryRestConfigurerAdapter从3.1开始被弃用，直接实现RepositoryRestConfigurer。

@Configuration
public class RepositoryConfiguration implements RepositoryRestConfigurer  {
	@Override
	public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
		config.exposeIdsFor(YouClass.class);
		RepositoryRestConfigurer.super.configureRepositoryRestConfiguration(config);
	}
}

字体：https://docs.spring.io/spring-data/rest/docs/current-SNAPSHOT/api/org/springframework/data/rest/webmvc/config/RepositoryRestConfigurer.html

Answer 9

只需在ID中添加 @JsonProperty 注释即可。

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

Spring引导@ResponseBody不会序列化实体ID

9 个答案: