Spring boot SpringRESTAPI返回未知的json格式

我的API开始返回这样的JSON：

{
  "links": [
    {
      "rel": "self",
      "href": "http://127.0.0.1:8888/books/4/instances"
    }
  ],
  "content": [
    {
      "donatorName": "Lee Anderson",
      "content": [],
      "links": [
        {
          "rel": "self",
          "href": "http://127.0.0.1:8888/book-instances/4"
        },
        {
          "rel": "bookInstance",
          "href": "http://127.0.0.1:8888/book-instances/4"
        },
        {
          "rel": "reservations",
          "href": "http://127.0.0.1:8888/book-instances/4/reservations"
        },
        {
          "rel": "library",
          "href": "http://127.0.0.1:8888/book-instances/4/library"
        },
        {
          "rel": "book",
          "href": "http://127.0.0.1:8888/book-instances/4/book"
        }
      ]
    },
    {
      "donatorName": "Leroy Guerrero",
      "content": [],
      "links": [
        {
          "rel": "self",
          "href": "http://127.0.0.1:8888/book-instances/5"
        },
        {
          "rel": "bookInstance",
          "href": "http://127.0.0.1:8888/book-instances/5"
        },
        {
          "rel": "reservations",
          "href": "http://127.0.0.1:8888/book-instances/5/reservations"
        },
        {
          "rel": "library",
          "href": "http://127.0.0.1:8888/book-instances/5/library"
        },
        {
          "rel": "book",
          "href": "http://127.0.0.1:8888/book-instances/5/book"
        }
      ]
    }
  ]
}

这不是hal+json，我找不到使用“内容”和“链接”（不带下划线）字段的约定。我做错了什么？我想要“_链接”和“嵌入”

我的pom.xml是：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo2</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.jayway.jsonpath</groupId>
            <artifactId>json-path</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

4.0.0
com.example
演示2
0.0.1-快照
罐子
演示2
SpringBoot的演示项目
org.springframework.boot
spring启动程序父级
1.4.3.1发布
UTF-8
UTF-8
1.8
org.springframework.boot
弹簧起动试验
测试
com.jayway.jsonpath
json路径
com.h2数据库
氢
org.springframework.boot
spring引导启动器数据jpa
org.springframework.boot
弹簧启动启动器数据rest
org.springframework.boot
springbootmaven插件

我的存储库是简单的分页和排序存储库类

package demo;

import java.util.List;

import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Page;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
//import org.springframework.hateoas.PagedResources;

@RepositoryRestResource(collectionResourceRel = "libraries", path = "libraries")
public interface LibraryRepository extends PagingAndSortingRepository<Library, Long> {

}

软件包演示；
导入java.util.List；
导入org.springframework.data.domain.Pageable；
导入org.springframework.data.domain.Page；
导入org.springframework.data.repository.paging和sortingrepository；
导入org.springframework.data.repository.query.Param；
导入org.springframework.data.rest.core.annotation.RepositoryRestResource；
//导入org.springframework.hateoas.PagedResources；
@RepositoryRestResource（collectionResourceRel=“libraries”，path=“libraries”）
公共接口库存储库扩展了分页和排序存储库{
}

---

我错过了什么？或者包含比我需要更多的内容？

好的，这是因为我在application.properties中添加了“spring.data.rest.defaultMediaType=application/xml”。我一定喜欢魔法