Spring Data Rest如何暴露ID字段

package com.example.demo.config;

import com.example.demo.model.Comp;
import com.example.demo.model.Person;
import org.apache.catalina.User;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter;

/**
 * @Author：LJ
 * @Description：为了解决Spring Data Rest不暴露ID字段的问题。
 * 参考：http://tommyziegler.com/how-to-expose-the-resourceid-with-spring-data-rest/
 * @Date: 2018/3/21
 * @Modified By:
 */
@Configuration
public class SpringDataRestConfig {
    @Bean
    public RepositoryRestConfigurer repositoryRestConfigurer() {
        return new RepositoryRestConfigurerAdapter() {
            @Override
            public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
                config.exposeIdsFor(User.class, Person.class, Comp.class);
            }
        };
    }
}

场景问题如下：

<!--通过REST 风格接口 暴露Spring Data数据库表-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

package com.example.demo.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class User {
    @Id
    @GeneratedValue
    private long id;
    @Column(nullable = false, unique = true)
    private String userName;
    @Column(nullable = false)
    private String password;
    @Column(nullable = false)
    private int age;

    public long getId() {
        return id;
    }

    public User setId(long id) {
        this.id = id;
        return this;
    }

    public String getUserName() {
        return userName;
    }

    public User setUserName(String userName) {
        this.userName = userName;
        return this;
    }

    public String getPassword() {
        return password;
    }

    public User setPassword(String password) {
        this.password = password;
        return this;
    }

    public int getAge() {
        return age;
    }

    public User setAge(int age) {
        this.age = age;
        return this;
    }
}

package com.example.demo.repository;

import com.example.demo.model.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {

    User findById(long id);

    void deleteById(long id);
}

运行http://localhost:8080/users，结果

{
  "_embedded" : {
    "user" : [ {
      "age" : "12",
     "password":"12345"，
     "user_name":"lisi"
    }, {
      "age" : "25",
      ......
}