public ConcurrentNavigableMap<String, Object> toTreeMap(final String json) {
        return GSON_MAP.fromJson(json, new TypeToken<ConcurrentSkipListMap<String, Object>>() {
        }.getType());
    }
To tree map.

@param json the json
@return the tree map
shenyu-common/src/main/java/org/apache/shenyu/common/utils/GsonUtils.java