unity文件资源的下载保存读取方法

unity文件资源的下载保存读取方法

unity的本地路径

Application.dataPath→安装路径（工程目录）

Application.streamingAssetsPath→安装路径（工程目录）下的StreamingAssets文件夹

Application.persistentDataPath →长期持有路径

Application.temporaryCachePath→缓存路径

文本文件保存

        /// <summary>
        /// 文本保存到文档
        /// </summary>
        /// <param name="path">本地保存路径</param>
        /// <param name="fileName">文件名称带后缀</param>
        /// <param name="jsonData">文字数据</param>
        public void StrFileWrite(string path, string fileName, string jsonData)
        {
            try
            {
                string filePath = path + fileName;
                if (File.Exists(filePath))
                {
                    //如果文件存在删除该文件
                    File.Delete(filePath);
                }
                FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write);
                StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                sw.WriteLine(jsonData);
                sw.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                Debug.LogError(ex);
            }
        }

读取文档文字

        /// <summary>
        /// 读取文档文字
        /// </summary>
        /// <param name="path">本地保存路径</param>
        /// <param name="fileName">文件名称带后缀</param>
        /// <returns>文件里的文字</returns>
        public string StrFileRead(string path, string fileName)
        {
            string filePath = path + fileName;
            string data = string.Empty;
            FileInfo fileInfo = new FileInfo(filePath);
            if (!fileInfo.Exists)//如果本地没有文件
            {
                return null;
            }
            else
            {
                try
                {
                    FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                    StreamReader sr = new StreamReader(fs, Encoding.UTF8);
                    data = sr.ReadToEnd();
                    sr.Close();
                    fs.Close();
                    return data;
                }
                catch 
                {
                    return null;
                }
            }
        }

保存资源到本地

        /// <summary>
        /// 保存资源到本地
        /// </summary>
        /// <param name="path">本地保存路径</param>
        /// <param name="fileName">文件名称带后缀</param>
        /// <param name="bytes">byte数据</param>
        /// <param name="byteLength">byte数据长度</param>
        public void SaveAssetFile(string path, string fileName, byte[] bytes, int byteLength)
        {
            string filePath = path + fileName;
            Stream sw = null;
            FileInfo fileInfo = new FileInfo(filePath);
            if (fileInfo.Exists)
            {
                //如果文件存在删除该文件
                File.Delete(filePath);
                Debug.Log("删除文件:" + filePath);
            }
            sw = fileInfo.Create();
            sw.Write(bytes, 0, byteLength);//写入
            sw.Flush();//关闭流
            sw.Close();//销毁流
            sw.Dispose();
            Debug.Log(fileName + "成功保存到本地~");
        }

下载资源

        /// <summary>
        /// 下载资源
        /// </summary>
        /// <param name="url">下载地址</param>
        /// <param name="receiveFunction"></param>
        public void DownloadData(string url)
        {
            Progree = 0;
            StartCoroutine(DownloadRequestData(url));
        }
        IEnumerator DownloadRequestData(string url)
        {
            using (var webRequest = UnityWebRequest.Get(url))
            {
                webRequest.SendWebRequest();
                if (webRequest.isNetworkError || webRequest.isHttpError)
                {

                    Debug.LogError(webRequest.error);
                }
                else
                {
                    while (!webRequest.isDone)
                    {
                        Progree = webRequest.downloadProgress * 100f;
                        yield return 0;
                    }
                    if (webRequest.isDone)
                    {
                        Progree = 1;
                        byte[] bytes=webRequest.downloadHandler.data;
                    }
                }
            }
        }