通过gson用动态键解析对象

Question

正如标题所说，我正在尝试解析一个对象，其键是动态字符串。我已经看了很长时间的一些答案，发现 1.this、2.this 和 3.this

供您参考，我对 Java 有点陌生，这是我第一次使用 Json 数据和解析

Json 响应如下所示：

{"Narcos": {"episodes": [{"season": 2, "name": "Episode #2.1", "number": 1}, {"season": 2, "name": "Episode #2.10", "number": 10}, {"season": 2, "name": "Episode #2.2", "number": 2}, {"season": 2, "name": "Episode #2.3", "number": 3}, {"season": 2, "name": "Episode #2.4", "number": 4}, {"season": 2, "name": "Episode #2.5", "number": 5}, {"season": 2, "name": "Episode #2.6", "number": 6}, {"season": 2, "name": "Episode #2.7", "number": 7}, {"season": 2, "name": "Episode #2.8", "number": 8}, {"season": 2, "name": "Episode #2.9", "number": 9}, {"season": 1, "name": "Descenso", "number": 1}, {"season": 1, "name": "Despegue", "number": 10}, {"season": 1, "name": "Explosivos", "number": 6}, {"season": 1, "name": "La Catedral", "number": 9}, {"season": 1, "name": "La Gran Mentira", "number": 8}, {"season": 1, "name": "The Men of Always", "number": 3}, {"season": 1, "name": "The Palace in Flames", "number": 4}, {"season": 1, "name": "The Sword of Sim\u00f3n Bolivar", "number": 2}, {"season": 1, "name": "There Will Be a Future", "number": 5}, {"season": 1, "name": "You Will Cry Tears of Blood", "number": 7}], "year": 2015}}

动态键，在本例中是“毒枭”。它基本上是您想要剧集的节目的名称。

我尝试了不同的方法。 对于第一个链接，解析代码如下：

ApiTest.class

Type mapType = new  TypeToken<Map<String, Serie> >() {}.getType(); // define generic type

    Map<String, Serie> serie = gson.fromJson(jsonString, mapType);

Serie.class

 public class Serie {

    private Episodes episodes;

Episodes.class

public class Episodes {

    private Episode[] episode;
    private int year;

剧集类

public class Episode {

    private int season;
    private String name;
    private int number;

当我使用第一种方法时，我得到了这个错误

Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 41 path $..episodes
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:224)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:187)
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145)
    at com.google.gson.Gson.fromJson(Gson.java:887)
    at com.google.gson.Gson.fromJson(Gson.java:852)
    at com.google.gson.Gson.fromJson(Gson.java:801)
    at testing.ApiTest.main(ApiTest.java:114)
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 41 path $..episodes
    at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:213)
    ... 9 more

当我尝试根据其他两个线程解析数据时，我创建了一个这样的响应类：

PoroResponse.class

public class PoroResponse {

    private Map<String, Serie> serie;

并将 ApiTest.class 中的代码更改为：

PoroResponse poro = gson.fromJson(jsonString, PoroResponse.class);

并试图通过这个来获得一个可以使用的数组：

Episode[] episodes = poro.get(poro).getSerie().getEpisodes().getEpisode();

我也试过这样解析：

Object o = new Gson().fromJson(json, Object.class);

但在最后两种情况下，要么我的 Serie 对象为 NULL，要么我得到一个具有 NULL 值的 LinkedTreeMap。

有人能指出我正确的方向吗？自 2 天以来，我一直被困在这个问题上，老实说，我不知道如何解决它。

Answer 1

也许你可以试试这个： 剧集类

    public class Episode {

    @SerializedName("season")
    @Expose
    private Integer season;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("number")
    @Expose
    private Integer number;


    public Integer getSeason() {
        return season;
    }


    public void setSeason(Integer season) {
        this.season = season;
    }


    public String getName() {
        return name;
    }


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


    public Integer getNumber() {
        return number;
    }


    public void setNumber(Integer number) {
        this.number = number;
    }

 }

然后是串行类：

    public class Serial {

    @SerializedName("episodes")
    @Expose
    private List<Episode> episodes = new ArrayList<Episode>();
    @SerializedName("year")
    @Expose
    private Integer year;

    public List<Episode> getEpisodes() {
        return episodes;
    }


    public void setEpisodes(List<Episode> episodes) {
        this.episodes = episodes;
    }


    public Integer getYear() {
        return year;
    }


    public void setYear(Integer year) {
        this.year = year;
    }

 }

然后要使用来自 JSON 的动态键生成 JAVA 对象，只需运行以下命令：

Type type = new TypeToken<Map<String, Serial>>() {
        }.getType();
Map<String, Serial> result = new Gson()
                .fromJson(new InputStreamReader(new ByteArrayInputStream(jsonString.getBytes())), type);

要获取例如 Narcos 序列信息，您需要这样写：

Serial narcosSerial = result.get("Narcos");