WWW网络请求

采用WWW获取网络数据：

（一）get

1)天气数据下载

    private string weatherApi = "http://www.sojson.com/open/api/weather/json.shtml?city={0}";
    //private string weatherApi = "http://www.sojson.com/open/api/weather/xml.shtml?city={0}"; //xml format
    public string city = "闵行区";
    private string fullWeatherApi;

    public void OnRequest()
    {
        StartCoroutine(DataRequest(fullWeatherApi));
    }

    private bool isResponseValid(WWW www)
    {
        if (www.error != null)
        {
            print("Conn failed!");
            return false;
        }

        if(string.IsNullOrEmpty(www.text))
        {
            print("Bad result");
            return false;
        }

        return true;
    }

    private IEnumerator DataRequest(string url)
    {
        WWW www = new WWW(url);
        yield return www;

        if (!isResponseValid(www)) yield break;

        print(www.text);
    }

2)texture下载

    public GameObject quad;
    private Texture2D downloadTexture;

    public void OnRequest()
    {
        ImageManage(SetSpirite);
    }

    private void ImageManage(Action<Texture2D> action)
    {
        if(downloadTexture ==null)//缓存检测
        {
            StartCoroutine(ImageRequest(beautyApi, action));
        }
        else
        {
            action(downloadTexture);
        }
    }

    private IEnumerator ImageRequest(string url,Action<Texture2D> action)
    {
        WWW www = new WWW(url);
        yield return www;
        print("request");
        downloadTexture = www.texture;
        action(www.texture);
    }

    private void SetSpirite(Texture2D texture)
    {
        quad.GetComponent<MeshRenderer>().material.mainTexture = texture;
    }

（二）post

    public string url = "https://api-cn.faceplusplus.com/facepp/v3/detect";
    private Hashtable postData = new Hashtable();

    public void OnRequest()
    {
        StartCoroutine(RequestData());
    }
    IEnumerator RequestData()
    {
        WWWForm postForm = new WWWForm();

        foreach(DictionaryEntry arg in postData)
        {
            postForm.AddField(arg.Key.ToString(), arg.Value.ToString());
        }

        WWW www = new WWW(url, postForm);
        yield return www;
        print(www.text);
    }
    // Use this for initialization
    void Start () {
        postData.Add("api_key", "**************");
        postData.Add("api_secret", "**************");
        postData.Add("image_url", "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508759666809&di=b3748df04c5e54d18fe52ee413f72f37&imgtype=0&src=http%3A%2F%2Fimgsrc.baidu.com%2Fimgad%2Fpic%2Fitem%2F562c11dfa9ec8a1389c45414fd03918fa1ecc06c.jpg");
    }

    // Update is called once per frame
    void Update () {

    }

补充：

post文件可通过WWWForm的AddBinaryData方法即可

第一个参数即为要post的文件的参数名称，第二参数为byte[]类型的文件，第三个为文件名称，第四个为类型。后两个参数可略掉。

 form.AddBinaryData("image_file", image, name, "file/jpg");

    public IEnumerator WwwPostRequest(byte[] image,string name,int i)
    {

        WWWForm form = new WWWForm();
        form.AddField("api_key", "*************");
        form.AddField("api_secret", "***************");
        form.AddField("faceset_token", "***************");
        form.AddBinaryData("image_file", image, name, "file/jpg");

        WWW w = new WWW("**********************", form);
        yield return w;
}

补充:

unity 通过www下载时，通过重载的形式来确定get，post方法（不同post方式也在重载中确定）；

public WWW(string url, WWWForm form);//对应post的multipart/form-data方式

public WWW(string url, byte[] postData);//对应application/x-www-form-urlencoded（此方式对应postdata为把传入参数按&符号连接后转化为byte[])和application/json方式(postdata为即把传入参数转换成json格式，在转化为byte[])

[Obsolete("This overload is deprecated. Use UnityEngine.WWW.WWW(string, byte[], System.Collections.Generic.Dictionary<string, string>) instead.")]
        public WWW(string url, byte[] postData, Hashtable headers);
        public WWW(string url, byte[] postData, Dictionary<string, string> headers);//即通过Dictionary指定post的方式如下：

System.Collections.Hashtable headers = new System.Collections.Hashtable();
        headers.Add("Content-Type", "application/x-www-form-urlencoded");//哈希表的数据格式

string data = "username=post&password=6789";
        byte[] bs = System.Text.UTF8Encoding.UTF8.GetBytes(data);

WWW www = new WWW("http://127.0.0.1/Test.php", bs, headers);