Unity 从服务器下载文件,保存到本地(Android,Windows)

使用UnityWebRequest进行下载操作

下载完成后,把文件保存在Application.persistentDataPath目录下面

博主已经真机测试过安卓和Windows系统了,可以放心食用

回调函数

    #region//CallBack
    public delegate void CallBack();
    public delegate void CallBack(T arg);
    public delegate void CallBack(T arg1, X arg2);
    public delegate void CallBack(T arg1, X arg2, Y arg3);
    public delegate void CallBack(T arg1, X arg2, Y arg3, Z arg4);
    #endregion

 persistentDataPath:常用的做本地缓存目录,它的读写权限都是开放的

/// 

/// 从服务器下载资源
/// 
/// 资源地址
/// 文件名字
/// 回调函数
public void LoadAssetsForServer(string uri,string fileName, CallBack action)
{
       UnityWebRequest request = UnityWebRequest.Get(uri);
       StartCoroutine(LoadAssetsForServer(request, fileName, action));
}

IEnumerator LoadAssetsForServer(UnityWebRequest unityWebRequest, string fileName, CallBack action)
{
       yield return unityWebRequest.SendWebRequest();
       if (unityWebRequest.isNetworkError)
       {
            Debug.Log("Download Error:" + unityWebRequest.error);
       }
       else
       {
        //下载完成后执行的回调
            if (unityWebRequest.isDone)
            {
            byte[] results = unityWebRequest.downloadHandler.data;
            string pathUrl = Application.persistentDataPath+"/File";
            //保存文件
            GameEntity.local.SaveFile(results, pathUrl, fileName, action);
            }

        }
}

//补充
//pass:加一个进度条功能
/// 

/// 从服务器下载资源
/// 
/// 资源路径
/// 资源保存
/// 保存路径
/// 回调函数
IEnumerator DownloadFileForServer(string url, string resSaveName, string fileSavePath,CallBack callBack)
{
      UnityWebRequest request = UnityWebRequest.Get(url);
      request.SendWebRequest();
      while (true)
      {
            if (request.isDone)
            {
                callBack(1);
                byte[] results = request.downloadHandler.data;
                string pathUrl = Application.persistentDataPath + "/"+ fileSavePath;
                GameEntity.local.SaveFile(results, pathUrl, resSaveName);
                yield break;
            }
            else if (request.isNetworkError)
            {
                callBack(0);
                Debug.Log("Download Error:" + request.error);
                yield break;
            }
            else
            {
                callBack(request.downloadProgress);
            }
            yield return null;
     }
}

/// 

/// 保存文件到本地
/// 
/// 
public void SaveFile(byte[] res,string savePath, string fileUrl, CallBack action)
{
       if (!File.Exists(savePath))
       {
            Directory.CreateDirectory(savePath);
       }

       string path = savePath + "/" + fileUrl;
       FileInfo file = new FileInfo(path);
       Stream sw;
       sw = file.Create();
       sw.Write(res, 0, res.Length);
       sw.Close();
       sw.Dispose();
       action();
}

//使用示例
void Start(){
    LoadAssetsForServer("http://192.168.1.1/gamedata.json","gamedata.json",CallAction);
}
void CallAction(){
    print("下载完成");
}