java - Gson 嵌套无名数组

Question

这个问题已经有答案了:

Why does Gson fromJson throw a JsonSyntaxException: Expected BEGIN_OBJECT but was BEGIN_ARRAY? (2 个回答)

已关闭 4 年前。

我正在使用 GSon 为我正在制作的游戏解析卡片列表，但我似乎遇到了困难。我试图解析的 json 是:

{
"name": "Core Set 2019",
"code": "M19",
"releaseDate": "2018-07-13",
"border": "black",
"type": "core",
"booster": [
  [
    "rare",
    "mythic rare"
  ],
  "uncommon",
  "uncommon",
  "uncommon",
  "common",
  "common",
  "common",
  "common",
  "common",
  "common",
  "common",
  "common",
  "common",
  "common",
  "land",
  "marketing"
]
}

问题出现在助推器部分。 netbeans 给出的错误消息是

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException:Expected a string but was BEGIN_ARRAY at line 9 column 8 path $.M19.booster[0]

到目前为止我的代码是:

public class Set
{
    public String name;
    public String code;
    public String releaseDate;
    public String border;
    public String type;
    public List<String> booster;
    public Translation translations;
    public List<Card> cards;
}

主要是我有

Gson g = new GsonBuilder().create();
Set sets = g.fromJson(new FileReader(JSONNAME), Set.class);

如何解析数组对象中的无名数组？无名数组并不总是存在，而且我无法更改 json，因为它是从我无权访问的网站下载的。

Answer 1

将您的类(class)更改为此类(class):

public class JsonResponse
{
    private String name;
    private String code;
    private String releaseDate;
    private String border;
    private String type;
    ArrayList< Object > booster = new ArrayList < Object > ();


    public String getName() {
        return name;
    }

    public String getCode() {
        return code;
    }

    public String getReleaseDate() {
        return releaseDate;
    }

    public String getBorder() {
        return border;
    }

    public String getType() {
        return type;
    }


    public void setName(String name) {
        this.name = name;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public void setReleaseDate(String releaseDate) {
        this.releaseDate = releaseDate;
    }

    public void setBorder(String border) {
        this.border = border;
    }

    public void setType(String type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return "JsonResponse{" +
                "name='" + name + '\'' +
                ", code='" + code + '\'' +
                ", releaseDate='" + releaseDate + '\'' +
                ", border='" + border + '\'' +
                ", type='" + type + '\'' +
                ", booster=" + booster +
                '}';
    }
}

就我而言，我将其放在 /resources/jsonexample.json 上，所以我这样做了:

Gson gson = new Gson();
        try {
            JsonResponse jsonResponse = gson.fromJson(new FileReader(new File("resources/jsonexample.json")), JsonResponse.class);
            System.out.println(jsonResponse.toString());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

输出是

JsonResponse{name='Core Set 2019', code='M19', releaseDate='2018-07-13', border='black', type='core', booster=[[rare, mythic rare], uncommon, uncommon, uncommon, common, common, common, common, common, common, common, common, common, common, land, marketing]}

我已经创建了一个存储库来说明如何在 Github 上执行此操作