com.google.gson.internal.LinkedHashTreeMap不能强制转换为我的对象

Question

我有一个JSON文件，看起来像

{
    "SUBS_UID" : {
        "featureSetName" : "SIEMENSGSMTELEPHONY MULTISIM",
        "featureName" : "MULTISIMIMSI",
        "featureKey" : [{
                "key" : "SCKEY",
                "valueType" : 0,
                "value" : "0"
            }
        ]
    },
}

因此，关键字是一个字符串"SUBS_ID“，值是一个名为FeatureDetails的模型，它包含属性"featureSetName，featureName，...”。所以我使用google.json库读取JSON文件，如下所示，

HashMap<String, FeatureDetails> featuresFromJson = new Gson().fromJson(JSONFeatureSet, HashMap.class);

然后我尝试遍历这个获取值的HashMap并将其转换为我的FeatureDetails模型，

for (Map.Entry entry : featuresFromJson.entrySet()) {
                    featureDetails = (FeatureDetails) entry.getValue();
                }

这是我的FeatureDetails模型，

public class FeatureDetails {

    private String featureSetName;
    private String featureName;
    private ArrayList<FeatureKey> featureKey;
    private String groupKey;
    private String groupValue;

    public FeatureDetails() {
        featureKey =  new ArrayList<FeatureKey>();
    }

    public ArrayList<FeatureKey> getFeatureKey() {
        return featureKey;
    }

    public void setFeatureKey(ArrayList<FeatureKey> featureKey) {
        this.featureKey = featureKey;
    }

    public String getGroupKey() {
        return groupKey;
    }

    public void setGroupKey(String groupKey) {
        this.groupKey = groupKey;
    }

    public String getGroupValue() {
        return groupValue;
    }

    public void setGroupValue(String groupValue) {
        this.groupValue = groupValue;
    }

    public String getFeatureName() {
        return featureName;
    }

    public void setFeatureName(String featureName) {
        this.featureName = featureName;
    }

    public String getFeatureSetName() {
        return featureSetName;
    }

    public void setFeatureSetName(String featureSetName) {
        this.featureSetName = featureSetName;
    }
} 

但是我得到了一个异常"com.google.gson.internal.LinkedHashTreeMap不能被转换为com.asset.vsv.models.FeatureDetail“。

Answer 1

试试这个：

HashMap<String, FeatureDetails> featuresFromJson = new Gson().fromJson(JSONFeatureSet, new TypeToken<Map<String, FeatureDetails>>() {}.getType());

当您遍历您的哈希图时，请执行以下操作：

for (Map.Entry<String, FeatureDetails> entry : featuresFromJson.entrySet()) {
                    FeatureDetails featureDetails = entry.getValue();
}

Answer 2

代码在Kotlin中:使用val type = object : TypeToken<HashMap<String, FoodLogEntry>>() {}.type Gson().fromJson(dataStr, type)

代替val type = object : TypeToken<Map<String, FoodLogEntry>>() {}.type Gson().fromJson(dataStr, type)注意:用HashMap代替映射

Answer 3

(objectName as Map<String, Any>).get("fieldName")