webclient类学习

(HttpWebRequest模拟请求登录):当一些硬件设备接口或需要调用其他地方的接口时，模拟请求登录获取接口的数据就很有必要。

webclient类:只想从特定的URI请求文件，则使用WebClient;

1.创建带Cookie的webclient：

    /// <summary>

    /// 带 Cookie 的 WebClient

    /// </summary>

    public class CookieWebClient : WebClient

    {

        // Cookie 容器

        public CookieContainer Cookies;  

        /// <summary>

        /// 创建一个新的 CookieWebClient 实例。

        /// </summary>

        public CookieWebClient()

        {

            this.Cookies = new CookieContainer();

        }  

        protected override WebRequest GetWebRequest(Uri address)

        {

            WebRequest request = base.GetWebRequest(address);

            if (request is HttpWebRequest)

            {

                HttpWebRequest httpRequest = request as HttpWebRequest;

                httpRequest.CookieContainer = Cookies;

            }

            return request;

        }

    }

2.http方法（Get、POST）:

public  CookieContainer cookies;

        internal string HttpGet(string Url)

        {

            string result = "";

            using (var client = new CookieWebClient())

            {

                client.Encoding = Encoding.UTF8;

                client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded,charset=UTF-8";

                client.Cookie = cookies;

                byte[] data = client.DownloadData(Url);

                result = Encoding.UTF8.GetString(data);

            }

            return result;

        }

        internal string HttpPost(string Url, string postDataStr)

        {

            string result = "";

            using (var client = new CookieWebClient())

            {

                client.Encoding = Encoding.UTF8;

                client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded; charset=UTF-8";

                byte[] post = Encoding.UTF8.GetBytes(postDataStr);

                byte[] data = client.UploadData(Url,post);

                result = Encoding.UTF8.GetString(data);

                cookies = client.Cookie;

            }

            return result;

        }

3. controller

 [HttpGet]

        public string Getinfo(string name, string pwd)

        {

            string hg = "";

            string url = "http://111.38.56.130:8084/LoginHandler.ashx?time=" + DateTime.Now;

            string loginp = "action=Login&flag=1&name={0}&pwd={1}&isRemember=false";

            string urlget = "http://111.38.56.130:8084/Company/IndexHandler.ashx?time={0}&action=deviceShowData&greenHouseSerialNum=00000F003G001";

            string param = string.Format(loginp, name, pwd);

            exta.http h = new exta.http();

            string r = h.HttpPost(url, param);

            if (r.Equals(""))

            {

                hg = h.HttpGet(string.Format(urlget, DateTime.Now));

            }

            return hg;

        }

巴特西

webclient类学习

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