對象轉換json時 key動態變動

1.需求分析

接口中間處理，調取第三方數據返回給前端，由於並行開發，提供給前端的字段名稱類型與第三方給的有差異

---

2.處理

利用jackson註解(2.9)

閱讀源碼發現 @JsonProperties  會同時改變序列化跟反序列化參數

@JsonSetter 只改變反序列化值

3.代碼

需要修改的類

@Data
public class VideoDO implements Serializable {
    private List<A> list;

    @Data
    public static class A implements Serializable {
        private Integer id;
        @JsonSetter("name")
        private String title;
        @JsonSetter("coverImage")
        private String image;
        private Integer studyNumber;
        @JsonSetter("updateTime")
        private Long time;
        private Integer isOfficial;
        @JsonSerialize(using = ListSerializer.class)
        private List tags;
    }
}

@Data
public class BaseModel<T> implements Serializable {
    private Integer code;
    private String message;
    private T data;
}

調用

BaseModel<VideoDO> baseModel =counselorFeign.findVideoList(0,0,0,0,10);

第三方給予數據格式

{
  "code": 0,
  "message": "操作成功",
  "data": {
    "list": [
      {
        "id": 55,
        "name": "客戶不爲自己代言誰之過？",
        "tags": [
          {
            "id": 261,
            "name": "客戶體驗"
          },
          {
            "id": 262,
            "name": "服務質量"
          },
          {
            "id": 263,
            "name": "客戶分析"
          }
        ],
        "coverImage": "http://ks3-cn01/19/2018011915524211203013.jpg",
        "duration": "00:12:28",
        "studyNumber": 143,
        "averageScore": 5,
        "type": 1,
        "updateTime": 1531381162000,
        "createTime": 1516348364000,
        "category": 4,
        "isOfficial": 1,
        "introduce": null
      },
      {
        "id": 54,
        "name": "如何快速與客戶建立信任？",
        "tags": [
          {
            "id": 256,
            "name": "客戶需求"
          },
          {
            "id": 257,
            "name": "簽單指導"
          },
          {
            "id": 258,
            "name": "溝通技巧"
          }
        ],
        "coverImage": "http://ks3-cn/2018031309305692103013.jpg",
        "duration": "00:18:30",
        "studyNumber": 264,
        "averageScore": 5,
        "type": 1,
        "updateTime": 1531381162000,
        "createTime": 1516348164000,
        "category": 4,
        "isOfficial": 1,
        "introduce": null
      },
      {
        "id": 48,
        "name": "U啊啊啊",
        "tags": [],
        "coverImage": "http://ks3-cn-2018/01/09/2018010913534786803013.jpg",
        "duration": "00:11:58",
        "studyNumber": 63,
        "averageScore": 0,
        "type": 2,
        "updateTime": 1535012114000,
        "createTime": 1515477231000,
        "category": 1,
        "isOfficial": 1,
        "introduce": null
      }
    ]
  }
}

返回數據

[
    {
      "id": 54,
      "title": "如何快速與客戶建立信任？",
      "image": "http://ks3-cn-/2018/03/13/jpg/2018031309305692103013.jpg",
      "studyNumber": 264,
      "time": 1531381162000,
      "isOfficial": 1,
      "tags": [
        "客戶需求",
        "簽單指導",
        "溝通技巧"
      ]
    },
    {
      "id": 56,
      "title": "電詢和麪詢、微信溝通的區別",
      "image": "http://ks3-cn-/2018/01/19/2018011916021250603013.jpg",
      "studyNumber": 301,
      "time": 1531381162000,
      "isOfficial": 1,
      "tags": [
        "現場諮詢",
        "電話溝通",
        "微信溝通"
      ]
    },
    {
      "id": 55,
      "title": "客戶不爲自己代言誰之過？",
      "image": "http://ks3-cn-/2018/01/19/2018011915524211203013.jpg",
      "studyNumber": 143,
      "time": 1531381162000,
      "isOfficial": 1,
      "tags": [
        "客戶體驗",
        "服務質量",
        "客戶分析"
      ]
    },
    {
      "id": 48,
      "title": "UNB-時訓",
      "image": "http://ks3-cn-i/2018/01/09/2018010913534786803013.jpg",
      "studyNumber": 63,
      "time": 1535012114000,
      "isOfficial": 1,
      "tags": []
    }
  ]

補充一個自定義的序列化規則（map轉list）這裏如果是mybatis直接映射就可以了。

public class ListSerializer extends JsonSerializer<List<Map>> {

    @Override
    public void serialize(List<Map> list, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {

        jsonGenerator.writeStartArray();
        list.forEach((k)->{
            try {
                jsonGenerator.writeString(k.get("name").toString());
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
        jsonGenerator.writeEndArray();
    }
}

附加個mybatis映射

<select id="findVideoInfoByVideoId" resultMap="videoInfo">
       SELECT
            v.id,
            v.image,
            v.title,
            v.time,
            (v.real_num+v.show_num) studyNumber,
            v.describe,
            v.speaker,
            v.score,
            vt.NAME,
            vu.video_url videoUrl,
            vu.video_sort videoSort,
            vu.video_name videoName,
            vu.video_duration videoDuration
        FROM video v
        LEFT JOIN video_tag_relation vtr ON vtr.video_id = v.id
        LEFT JOIN video_tag vt ON vtr.tag_id = vt.id
        LEFT JOIN video_url vu ON vu.video_id= v.id
        WHERE v.id=#{videoId}
    </select>
    <resultMap id="videoInfo" type="java.util.HashMap">
        <id property="id" column="id"></id>
        <result property="image" column="image"></result>
        <result property="title" column="title"></result>
        <result property="time" column="time"></result>
        <result property="describe" column="describe"></result>
        <result property="speaker" column="speaker"></result>
        <result property="score" column="score"></result>
        <result property="studyNumber" column="studyNumber"></result>
        <collection property="tags" javaType="java.util.List" ofType="java.lang.String">
            <result property="name" column="name"></result>
        </collection>
        <collection property="urls" javaType="java.util.List" ofType="java.util.Map">
            <result property="videoUrl" column="videoUrl"></result>
            <result property="videoName" column="videoName"></result>
            <result property="videoSort" column="videoSort"></result>
            <result property="videoDuration" column="videoDuration"></result>
        </collection>
    </resultMap>

javaType="java.util.List" ofType="java.util.Map"  相當於 List<Map>數據結構