c# Http Post访问接口方式

一、json格式数据提交返回

提交和返回数据都为json格式

参数提交方式：application/json;charset=UTF-8

统一采用UTF-8字符编码

        public  string Post(string Url, string jsonParas)
        {
            string strURL = Url;
            //创建一个HTTP请求
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
            //Post请求方式
            request.Method = "POST";
            //内容类型
            request.ContentType = "application/x-www-form-urlencoded";

            //设置参数，并进行URL编码 

            string paraUrlCoded = jsonParas;//System.Web.HttpUtility.UrlEncode(jsonParas);   

            byte[] payload;
            //将Json字符串转化为字节
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            //设置请求的ContentLength
            request.ContentLength = payload.Length;
            //发送请求，获得请求流 

            Stream writer;
            try
            {
                writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
            }
            catch (Exception)
            {
                writer = null;
                Console.Write("连接服务器失败!");
            }
            //将请求参数写入流
            writer.Write(payload, 0, payload.Length);
            writer.Close();//关闭请求流
           // String strValue = "";//strValue为http响应所返回的字符流
            HttpWebResponse response;
            try
            {
                //获得响应流
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
            }
            Stream s = response.GetResponseStream();
            //  Stream postData = Request.InputStream;
            StreamReader sRead = new StreamReader(s);
            string postContent = sRead.ReadToEnd();
            sRead.Close();
            return postContent;//返回Json数据
        }
调用：   string askurl = testUrl + "?sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs;
          string relust = Post(askurl, "");
         // 或者  string relust = Post(askurl, sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs);

　　二、也是josn格式，utf8

   /// <summary>
        /// POST数据到指定地址
        /// </summary>
        /// <param name="url"></param>
        /// <param name="encoding"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string PostDataToUrl(string url, System.Text.Encoding encoding, System.Collections.Specialized.NameValueCollection data)
        {
            //设置HttpWebRequest
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(new Uri(url));
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Method = "POST";
            request.KeepAlive = false;

            byte[] buffer;
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
            {
                for (int i = ; i < data.Count; i++)
                {
                    buffer = encoding.GetBytes(data.Keys[i]);
                    if (i > )
                        ms.WriteByte(Convert.ToByte('&'));
                    ms.Write(buffer, , buffer.Length);
                    ms.WriteByte(Convert.ToByte('='));
                    buffer = encoding.GetBytes(HttpUtility.UrlEncode(data[i]));
                    ms.Write(buffer, , buffer.Length);
                }
                buffer = ms.ToArray();
            }

            request.ContentLength = buffer.Length;
            using (

                System.IO.Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(buffer, , buffer.Length);
                requestStream.Close();
            }

            try
            {
                //获取数据
                using (System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)(request.GetResponse()))
                using (System.IO.Stream stream = response.GetResponseStream())
                using (System.IO.StreamReader reader = new System.IO.StreamReader(stream, encoding))
                {
                    string result = reader.ReadToEnd();
                    reader.Close();
                    stream.Close();
                    response.Close();
                    return result;
                }
            }
            finally
            {
                request.Abort();
            }
        }

   调用方法：
      Byte[] bytes = Encoding.UTF8.GetBytes(msg);
            //转换成Base64字符串
            msg = BytesToBase64(bytes);
            string encodeMsgs = System.Web.HttpUtility.UrlEncode(msg);//urlencode编码
            NameValueCollection vc = new NameValueCollection();
            vc.Add("sid", sid);
            vc.Add("mobi", mobi);
            vc.Add("sign", sign);
            vc.Add("msg", encodeMsgs);

三、带证书Xml提交数据

    public static string PostHttpsPost(string url, string data, string token,string sign, Encoding encoding)
        {
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);
            System.Net.ServicePointManager.DefaultConnectionLimit = ;
            Uri uri = new Uri(url);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
            //User-AgentHTTP标头的值
            request.UserAgent = "Code Sample Web Client";
            request.Credentials = CredentialCache.DefaultCredentials;
            request.Method = "post";
            if (!string.IsNullOrEmpty(token) && !string.IsNullOrEmpty(sign))//除了Auth接口以外其他post接口都需要传这两个参数
            {
                request.Headers.Add("4GGOGO-Auth-Token", token);
                request.Headers.Add("HTTP-X-4GGOGO-Signature", sign);
            }
            request.ContentType = "text/xml";
            request.Headers.Add("charset:utf-8");
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            request.Timeout = ;
            request.KeepAlive = false;
            request.ProtocolVersion = HttpVersion.Version10;
            request.CookieContainer = new CookieContainer();
            CookieCollection cookies = new CookieCollection();
            request.CookieContainer.Add(cookies);
            byte[] buffer = Encoding.UTF8.GetBytes(data);
            request.ContentLength = buffer.Length;
            X509Certificate cer = new X509Certificate("E:\\pdata.cer", "changeit");//证书地址和密码
            request.ClientCertificates.Add(cer);
            System.GC.Collect();
            //如果需要POST数据
              if (data != null)
              {
                  string result = "";
                  //reqStream.Write(buffer, 0, buffer.Length);
                  //reqStream.Close();
                  using (System.IO.Stream requestStream = request.GetRequestStream())
                  {
                      requestStream.Write(buffer, , buffer.Length);
                      requestStream.Close();
                  }
                  HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                  //获取服务端返回数据
                  StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                  result = sr.ReadToEnd().Trim();
                  sr.Close();
                  //关闭连接和流
                  if (response != null)
                  {
                      response.Close();
                  }
                  if (request != null)
                  {
                      request.Abort();
                  }
                  return result;
              }
            return "";
        }
//调用：
 string data = HelpCommon.GetAuthXml(requestTime, AppKey, signature);//获取xml字符串拼接，也可以是data序列化成xml数据
                string reslut = WebUtils.PostHttpsPost(apiUrl, data, "", "", encoding);
                var amodel = XmlHelper.XmlDeserialize<TrafficWebInAPI.Models.AuthModel.Response>(reslut);