Unity发布WebGL之后用UnityWebRequest读取StreamingAssets文件路径数据

痛定思痛。 2022-12-07 15:21 994阅读 0赞

> Unity打包WebGL之后保留了StreamingAssets文件夹，但是使用Application.streamingAssetsPath是无法读取到StreamingAssets文件路径的。为了能正确读取到本地StreamingAssets文件的数据，我们需要使用到UnityWebRequest类。

**UnityWebRequest 由三个元素组成**

>  *  UploadHandler 处理数据将数据发送到服务器的对象
>  *  DownloadHandler 从服务器接收数据的对象
>  *  UnityWebRequest 负责 HTTP通信流量控制来管理上面两个对象的对象。

**Uri类**  
System.Uri这个类，这个类可以帮助我们更好的构造uri，特别是在使用本地路径得时候，结合Path.Combine能更好的得出Uri路径。因为平台的区别，Uri路径也不同：

>  *  Windows平台 *file:///D:/DATA/StreamingAssets/data.json*
>  *  WebGl平台 *http://localhost/StreamingAssets/data.json*
>  *  Android平台 *jar:file:///data/app/xxx!/assets/data.json*
>  *  iOS平台 *Application/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/xxx.app/Data/Raw*

使用Path.Combine拼接路径字符串

> var uri = new System.Uri(Path.Combine(Application.streamingAssetsPath,  
> “data.json”));

**使用UnityWebRequest.Get读取文件**

public class JsonTest : MonoBehaviour
    {
        private void Start()
        {
            StartCoroutine(GetData());
        }
    
        IEnumerator GetData()
        {
            var  uri = new  System.Uri(Path.Combine(Application.streamingAssetsPath,"test.txt"));
            UnityWebRequest www = UnityWebRequest.Get(uri);
            yield return www.SendWebRequest();
     
            if(www.isNetworkError || www.isHttpError) {
                Debug.Log(www.error);
            }
            else
            {
                Debug.Log(www.downloadHandler.text);
                string jsonStr  = www.downloadHandler.text;
    
                TestData data = JsonMapper.ToObject<TestData>(jsonStr);
                
                Debug.Log("姓名：" + data.userName + "\n年龄：" + data.age);
            }
        }
    }
    
    [System.Serializable]
    public class TestData
    {
        public string userName;
        public int age;
    }

测试test.txt数据：

{
       "userName":"王武",
       "age":26
    }

参考：

[https://blog.csdn.net/Glow0129/article/details/104982681][https_blog.csdn.net_Glow0129_article_details_104982681]

[https://www.jianshu.com/p/8631ae7dd653?utm\_campaign=hugo&utm\_medium=reader\_share&utm\_content=note][https_www.jianshu.com_p_8631ae7dd653_utm_campaign_hugo_utm_medium_reader_share_utm_content_note]

[https_blog.csdn.net_Glow0129_article_details_104982681]: https://blog.csdn.net/Glow0129/article/details/104982681
[https_www.jianshu.com_p_8631ae7dd653_utm_campaign_hugo_utm_medium_reader_share_utm_content_note]: https://www.jianshu.com/p/8631ae7dd653?utm_campaign=hugo&utm_medium=reader_share&utm_content=note