准备工作

 目录

 1 HttpGet

 /// <summary>

        /// 使用Get方法获取字符串结果（没有加入Cookie）

        /// </summary>

        /// <param name="url"></param>

        /// <returns></returns>

        public static async Task<string> HttpGetAsync(string url, Encoding encoding = null)

        {

            HttpClient httpClient = new HttpClient();

            var data = await httpClient.GetByteArrayAsync(url);

            var ret = encoding.GetString(data);

            return ret;

        }

        /// <summary>

        /// Http Get 同步方法

        /// </summary>

        /// <param name="url"></param>

        /// <param name="encoding"></param>

        /// <returns></returns>

        public static string HttpGet(string url, Encoding encoding = null)

        {

            HttpClient httpClient = new HttpClient();

            var t = httpClient.GetByteArrayAsync(url);

            t.Wait();

            var ret = encoding.GetString(t.Result);

            return ret;

        }

 2 HttpPost方法

 /// <summary>

        /// POST 异步

        /// </summary>

        /// <param name="url"></param>

        /// <param name="postStream"></param>

        /// <param name="encoding"></param>

        /// <param name="timeOut"></param>

        /// <returns></returns>

        public static async Task<string> HttpPostAsync(string url, Dictionary<string, string> formData = null,  Encoding encoding = null, int timeOut = 10000 )

        {  

            HttpClientHandler handler = new HttpClientHandler();

            HttpClient client = new HttpClient(handler);

            MemoryStream ms = new MemoryStream();

            formData.FillFormDataStream(ms);//填充formData

            HttpContent hc = new StreamContent(ms); 

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/html"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xhtml+xml"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml", 0.9));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("image/webp"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*", 0.8));

            hc.Headers.Add("UserAgent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36");

            hc.Headers.Add("Timeout", timeOut.ToString());

            hc.Headers.Add("KeepAlive", "true"); 

            var r = await client.PostAsync(url, hc);

            byte[] tmp = await r.Content.ReadAsByteArrayAsync();

            return encoding.GetString(tmp);

        }

        /// <summary>

        /// POST 同步

        /// </summary>

        /// <param name="url"></param>

        /// <param name="postStream"></param>

        /// <param name="encoding"></param>

        /// <param name="timeOut"></param>

        /// <returns></returns>

        public static string HttpPost(string url, Dictionary<string, string> formData = null, Encoding encoding = null, int timeOut = 10000)

        {

            HttpClientHandler handler = new HttpClientHandler();

            HttpClient client = new HttpClient(handler);

            MemoryStream ms = new MemoryStream();

            formData.FillFormDataStream(ms);//填充formData

            HttpContent hc = new StreamContent(ms);

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/html"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xhtml+xml"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml", 0.9));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("image/webp"));

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*", 0.8));

            hc.Headers.Add("UserAgent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36");

            hc.Headers.Add("Timeout", timeOut.ToString());

            hc.Headers.Add("KeepAlive", "true");

            var t =   client.PostAsync(url, hc);

            t.Wait();

           var t2 =   t.Result.Content.ReadAsByteArrayAsync();

            return encoding.GetString(t2.Result);

        }

        /// <summary>

        /// 组装QueryString的方法

        /// 参数之间用&连接，首位没有符号，如：a=1&b=2&c=3

        /// </summary>

        /// <param name="formData"></param>

        /// <returns></returns>

        public static string GetQueryString(this Dictionary<string, string> formData)

        {

            if (formData == null || formData.Count == 0)

            {

                return "";

            }

            StringBuilder sb = new StringBuilder();

            var i = 0;

            foreach (var kv in formData)

            {

                i++;

                sb.AppendFormat("{0}={1}", kv.Key, kv.Value);

                if (i < formData.Count)

                {

                    sb.Append("&");

                }

            }

            return sb.ToString();

        }

        /// <summary>

        /// 填充表单信息的Stream

        /// </summary>

        /// <param name="formData"></param>

        /// <param name="stream"></param>

        public static void FillFormDataStream(this Dictionary<string, string> formData, Stream stream)

        {

            string dataString = GetQueryString(formData);

            var formDataBytes = formData == null ? new byte[0] : Encoding.UTF8.GetBytes(dataString);

            stream.Write(formDataBytes, 0, formDataBytes.Length);

            stream.Seek(0, SeekOrigin.Begin);//设置指针读取位置

        }

3 示例

@{

    ViewData["Title"] = "Home Page";

    Layout = null;

}

@{

   @*var ret1=await httpclientdemo.HttpHelper.HttpGetAsync("http://www.baidu.com", System.Text.Encoding.GetEncoding("utf-8"));

    @Html.Raw(ret1)*@

    @*var ret2 = httpclientdemo.HttpHelper.HttpGet("http://www.baidu.com", System.Text.Encoding.GetEncoding("utf-8"));

    @Html.Raw(ret2)*@

    var ret3 = httpclientdemo.HttpHelper.HttpPost("http://www.baidu.com",null, System.Text.Encoding.GetEncoding("utf-8"));

    @Html.Raw(ret3)

    @*var ret4 = await httpclientdemo.HttpHelper.HttpPostAsync("http://www.baidu.com", null, System.Text.Encoding.GetEncoding("utf-8"),10000);

    @Html.Raw(ret4)*@

}