Type type = new TypeToken<Map<String, Object>>() {
    }.getType();
    Map<String, Object> dataMap = gson.fromJson(json, type);

呼叫以上程式碼把json串轉換為map時，如果json串中包含0、1等int型別的內容，map中將會轉成“0.0”、“1.0”等浮點型別。

可以通過一下方式消除這種型別轉換異常：

private static Gson gson = new GsonBuilder()
            .registerTypeAdapter(
                    new TypeToken<TreeMap<String, Object>>(){}.getType(),
                    new JsonDeserializer<TreeMap<String, Object>>() {
                        @Override
                        public TreeMap<String, Object> deserialize(
                                JsonElement json, Type typeOfT,
                                JsonDeserializationContext context) throws JsonParseException {

                            TreeMap<String, Object> treeMap = new TreeMap<>();
                            JsonObject jsonObject = json.getAsJsonObject();
                            Set<Map.Entry<String, JsonElement>> entrySet = jsonObject.entrySet();
                            for (Map.Entry<String, JsonElement> entry : entrySet) {
                                Object ot = entry.getValue();
                                if(ot instanceof JsonPrimitive){
                                    treeMap.put(entry.getKey(), ((JsonPrimitive) ot).getAsString());
                                }else{
                                    treeMap.put(entry.getKey(), ot);
                                }
                            }
                            return treeMap;
                        }
                    }).create();
    private static Type typeToken = new TypeToken<TreeMap<String, Object>>(){}.getType();
 

然後在轉換的地方這樣呼叫：

loadJSON(){
    TreeMap<String, Object> map =  gson.fromJson(json, typeToken);
    //bodyMap.get("error").toString();
    //Integer.parseInt(bodyMap.get("errno").toString());
}