/// <summary>
    /// // 判断是否已有相同文件,没有就新建
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    public bool CheckJsonPath(string path)
    {
        if (!File.Exists(path))  // 判断是否已有相同文件 
        {
           
            CreateJson(path);
            
            print("未找到文件，已创建新的文件："+path);
            return false;
        }
        else
        {
            print("文件存在");
            return true;
        }
    }
    /// <summary>
    /// 新建Json
    /// </summary>
    /// <param name="strPath">新建的位置</param>
    /// <param name="user">对象</param>
    public static void CreateJson(string strPath)
    {
        InfoList infoList = new InfoList();
        //序列化
        string json = JsonUtility.ToJson(infoList);
        StreamWriter sw = new StreamWriter(strPath);
        sw.Write(json);
        sw.Close();
    }

上边代码中的数据类

[System.Serializable]
public class InfoList
{
    public List<AutoInfo> autoInfos = new List<AutoInfo>();
}

    public string ReadJson(string FullPath)
    {
        //string FilePath = Application.streamingAssetsPath + "/JsonPerson.json";
        string JsonString = File.ReadAllText(FullPath);
        //反序列化
        JsonUtility.FromJson<InfoList>(JsonString);
        return JsonString;
    }