Unity 的 HTTP 网络通信

使用的工具类

Unity 中 UnityWebRequest 和 WWW 都可以实现 HTTP 请求，不过后者已经被标上过时了

Get 请求

IEnumerator GetRequest(string url)
{
    using (UnityWebRequest webRequest = UnityWebRequest.Get(url))
    {
        yield return webRequest.SendWebRequest();
        if (!string.IsNullOrEmpty(webRequest.error))
        {
            Debug.LogError(webRequest.error);
        }
        else
        {
            Debug.Log(webRequest.downloadHandler.text);
        }
    }
}

可以改造一下上面的请求，通过回调函数来执行结果

public class NetworkTool
{
    private const string Url = "http://localhost:8683";
    public delegate void RequestCallback(string result);

    public static IEnumerator GetRequest(string path, RequestCallback callback)
    {
        using (var webRequest = UnityWebRequest.Get(Url + path))
        {
            yield return webRequest.SendWebRequest();
            if (!string.IsNullOrEmpty(webRequest.error))
            {
                Debug.LogError(webRequest.error);
            }
            else
            {
                callback( webRequest.downloadHandler.text);
            }
        }
    }
}

下载图片

public class UNityWebTest : MonoBehaviour
{
    string url = @"http://pic37.nipic.com/20140113/8800276_184927469000_2.png";

    void Start()
    {
        StartCoroutine(DownSprite());
        StartCoroutine(DownMaterial());
    }

    IEnumerator DownSprite()
    {
        UnityWebRequest wr = new UnityWebRequest(url);
        DownloadHandlerTexture texDl = new DownloadHandlerTexture(true);
        wr.downloadHandler = texDl;
        yield return wr.SendWebRequest();
        int width = 1920;
        int high = 1080;
        if (!wr.isNetworkError)
        {
            tex = texDl.texture;
            Sprite sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f));
            transform.GetComponent<Image>().sprite = sprite;
        }
    }
    IEnumerator DownMaterial()
    {
        UnityWebRequest wr = new UnityWebRequest(url);
        DownloadHandlerTexture texDl = new DownloadHandlerTexture(true);
        wr.downloadHandler = texDl;
        yield return wr.SendWebRequest();
        if (!wr.isNetworkError)
        {
            Texture2D tex = null;
            tex = texDl.texture;
            GameObject.Find("Cube").GetComponent<Renderer>().material.mainTexture = tex;
        }
    }

    private void OnApplicationQuit()
    {
        StopAllCoroutines();
    }
}

Post 请求

提交表单

IEnumerator PostRequest(string url)
{
    WWWForm form = new WWWForm();
    form.AddField("name", "posttest");
    using (UnityWebRequest webRequest = UnityWebRequest.Post(url, form))
    {
        yield return webRequest.SendWebRequest();
        if (!string.IsNullOrEmpty(webRequest.error))
        {
            Debug.LogError(webRequest.error);
        }
        else
        {
            Debug.Log(webRequest.downloadHandler.text);
        }
    }
}

Post 请求需要用到 WWWForm 来添加 post 数据，WWWForm.AddBinaryData 还可以添加二进制数据（如上传文件）。

也可以直接传入一个 Dictionary<string, string> 的字典，作用同 WWWForm

发送 JSON 数据

这里使用回调函数，方便请求成功后执行相应的方法

private const string Url = "http://localhost:8683";
public delegate void RequestCallback(string result);

 /// <summary>
 /// Post 请求，发送 JSON
 /// </summary>
 /// <param name="path">请求地址</param>
 /// <param name="json">发送的 json 数据</param>
 /// <param name="callback">回调函数</param>
 /// <returns></returns>
 public static IEnumerator PostJsonRequest(
     string path,
     string json,
     RequestCallback callback)
 {
     // 默认的 POST 请求是 application/x-www-form-urlencoded 所以这里不能直接使用 POST 方法
     using (var webRequest = new UnityWebRequest(Url + path, UnityWebRequest.kHttpVerbPOST))
     {
         webRequest.uploadHandler = new UploadHandlerRaw(Encoding.UTF8.GetBytes(json));
         webRequest.downloadHandler = new DownloadHandlerBuffer();
         webRequest.SetRequestHeader("Content-Type", "application/json;charset=utf-8");

         yield return webRequest.SendWebRequest();
         if (!string.IsNullOrEmpty(webRequest.error))
         {
             Debug.LogError(webRequest.error);
         }
         else
         {
             callback(webRequest.downloadHandler.text);
         }
     }
 }

Reference

参考资料 unity实现HTTP请求 参考资料 UnityWebRequest 加载网络图片当作贴图给物体