Gson用不同的值类型反序列化json

您可以使用自定义解串器来完成此操作。首先，我们应该创建可以表示您的JSON的数据模型。

class JsonEntity {    private List<Movie> movies;    public List<Movie> getMovies() {        return movies;    }    public void setMovies(List<Movie> movies) {        this.movies = movies;    }    @Override    public String toString() {        return "JsonEntity [movies=" + movies + "]";    }}class Movie {    private String title;    private Profile in_wanted;    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public Profile getIn_wanted() {        return in_wanted;    }    public void setIn_wanted(Profile in_wanted) {        this.in_wanted = in_wanted;    }    @Override    public String toString() {        return "Movie [title=" + title + ", in_wanted=" + in_wanted + "]";    }}class Profile {    private boolean value;    public boolean isValue() {        return value;    }    public void setValue(boolean value) {        this.value = value;    }    @Override    public String toString() {        return String.valueOf(value);    }}

现在，当我们拥有所有需要的类时，我们应该实现新的自定义反序列化器：

class ProfileJsonDeserializer implements JsonDeserializer<Profile> {    @Override    public Profile deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext context) throws JsonParseException {        if (jsonElement.isJsonPrimitive()) { return null;        }        return context.deserialize(jsonElement, JsonProfile.class);    }}class JsonProfile extends Profile {}

请

JsonProfile

现在我们可以使用测试方法来测试我们的解决方案了：

GsonBuilder builder = new GsonBuilder();builder.registerTypeAdapter(Profile.class, new ProfileJsonDeserializer());Gson gson = builder.create();JsonEntity jsonEntity = gson.fromJson(new FileReader("/tmp/json.txt"),        JsonEntity.class);System.out.println(jsonEntity);