像这样的 List 集合 java 类怎么设计

Question

javascript[
    {
        "recommendation_id": 586,
        "status": 1,
        "type": "explores",
        "seq": 597,
        "keyword_id": 848,
        "name": "门头设计",
        "urlname": "mentousheji",
        "cover": {
            "bucket": "hbfile",
            "key": "dd3eb7af6bf69adfd8ee8be24703e9fe10041df61f164"
        },
        "description": "门头，是指企业、事业单位和个体工商户(以下简称单位)在门口设置的牌匾及相关设施。门头是一个商铺店门外的装饰形式。整体上说，制作精美的门头是美化销售场所和装饰店铺、吸引顾客的一种手段，是提升店面形象的重要方法。精心设计门头，是现代装饰的重要内容。",
        "recommended_users": null,
        "creator_id": null,
        "is_hidden": 0,
        "follow_count": 13,
        "target_id": 848,
        "title": "门头设计",
        "url": "http://huaban.com/explore/mentousheji/"
    },
    {
        "recommendation_id": 584,
        "status": 1,
        "type": "boards",
        "seq": 194,
        "board_id": 18682745,
        "user_id": 327260,
        "title": "◤各种黑白海报 | Black&White◢",
        "description": "",
        "category_id": "design",
        "pin_count": 161,
        "follow_count": 214,
        "like_count": 1,
        "created_at": 1417504894,
        "updated_at": 1420450108,
        "deleting": 0,
        "is_private": 0,
        "user": {
            "username": "花蓉",
            "urlname": "nininini757",
            "pin_count": 20165,
            "follow_count": 28573,
            "user_id": 327260
        },
        "target_id": 18682745,
        "cover": {
            "bucket": "hbfile",
            "key": "a81b9392c3a197d596ec9ae4d337535295554e9d1a2df"
        },
        "url": "http://huaban.com/boards/18682745/"
    },
    {
        "recommendation_id": 583,
        "status": 1,
        "type": "users",
        "seq": 594,
        "user_id": 9893639,
        "username": "我爱的人终变成我心里的针",
        "urlname": "love734889400",
        "created_at": 1379850964,
        "avatar": {
            "id": 29775572,
            "farm": "farm1",
            "bucket": "hbimg",
            "key": "69706c1194d0cc588a948fdbfb4628227dc1292b163d-bW6ftL",
            "type": "image/jpeg",
            "width": 139,
            "height": 144,
            "frames": 1
        },
        "pin_count": 5222,
        "follow_count": 30138,
        "target_id": 9893639,
        "cover": {
            "bucket": "",
            "key": ""
        },
        "title": "我爱的人终变成我心里的针",
        "url": "http://huaban.com/love734889400/"
    }
]

用的是 GSON 转json

已经有 Explores，Boards，Users 三个类

设计了一个 Recommendation 类

recommendation数据库是 recommendation_id，status，type，seq，title，url 字段

jackson 里面有一个 @JsonUnwrapped 注解

@JsonUnwrapped 作用在属性字段或方法上，用来将子JSON对象的属性添加到封闭的JSON对象

如果没有@JsonUnwrapped，序列化后将为{"id":111,"name":{"firstName":"张","secondName":"三"}}

反之：{"id":111,"firstName":"张","secondName":"三"}

不这个 GSON 有没有这个方法

Answer 1

json的键就是类的字段名，看见一个键后面是“{”就创建一个类，看见键后面是“[”就是一个List，这样就简单了。

Recommendation里包含Cover、Avatar、User三个类，分别对应cover、avatar和user字段

//类定义
public class Recommendation{
    public long recommendationId;
    //...
    public User user;
    public Cover cover;
    public Avatar avatar;
}

public class User {
    private Long userId;
    private String username;
    ...
}

public class Cover {
    private String key;
    private String bucket;
}

public class Avatar{
    private int id;
    // ...
    private int width;
    private int height;
    private int frames;
}

//解析
Gson gson = new Gson();
Type type = new TypeToken<List<Recommendation>>(){}.getType();//最外面是个List
String json = "json内容";//String也可以是一个Reader
List<Recommendation> = gson.fromJson(json,type);
// TODO

Answer 2

public class Item {
    private Long recommendationId;
    private Integer status;
    private String type;
    ...
    private User user;
    private Cover cover;
}

public class User {
    private Long userId;
    private String username;
    ...
}

public class Cover {
    private String key;
    private String bucket;
}

上面的代码省去了 getter 和 setter。我看基本上照这样做就是了，没有什么特别的地方。