C# HttpWebRequest发送post请求调用API

最近有用到C#客户端调用Java开发服务端的需求，将httphelper分享出来给需要的朋友。

    public class HttpHelper
    {
        static QRConfig _Config = new QRConfig();
        public static string PostForm(string url, Dictionary<string, string> datas)
        {
            HttpWebRequest request = null;
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                // 这里设置了协议类型。
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;// SecurityProtocolType.Tls1.2; 
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                ServicePointManager.CheckCertificateRevocationList = true;
                ServicePointManager.DefaultConnectionLimit = 100;
                ServicePointManager.Expect100Continue = false;
                X509Certificate cerCaiShang = new X509Certificate(_Config.PfxFile, _Config.CER_CODE);
                request = WebRequest.Create(url) as HttpWebRequest;
                request.ClientCertificates.Add(cerCaiShang);
                request.ProtocolVersion = HttpVersion.Version11;
 
                request.KeepAlive = false;
               
            }
            else
            {
                request = (HttpWebRequest)WebRequest.Create(url);
            }
 
            request.Method = "POST";    //使用get方式发送数据
            request.ContentType = "application/x-www-form-urlencoded";
            request.Referer = null;
            request.AllowAutoRedirect = true;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            request.Accept = "*/*";
            request.Timeout = 1000 * 5;
 
            byte[] data = Encoding.UTF8.GetBytes(BuildQuery(datas));
            request.ContentLength = data.Length;
            Stream newStream = request.GetRequestStream();
            newStream.Write(data, 0, data.Length);
            newStream.Close();
 
            //获取网页响应结果
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            //client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            string result = string.Empty;
            using (StreamReader sr = new StreamReader(stream))
            {
                result = sr.ReadToEnd();
            }
 
            return result;
        }
 
        public static string PostUrl(string url, string postData)
        {
            HttpWebRequest request = null;
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                // 这里设置了协议类型。
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;// SecurityProtocolType.Tls1.2; 
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                ServicePointManager.CheckCertificateRevocationList = true;
                ServicePointManager.DefaultConnectionLimit = 100;
                ServicePointManager.Expect100Continue = false;
                
                X509Certificate cerCaiShang = new X509Certificate(_Config.PfxFile, _Config.CER_CODE);
                request = WebRequest.Create(url) as HttpWebRequest;
                request.ClientCertificates.Add(cerCaiShang);
                request.ProtocolVersion = HttpVersion.Version11;
                request.Timeout = 1000 * 5;
                request.KeepAlive = false;
 
            }
            else
            {
                request = (HttpWebRequest)WebRequest.Create(url);
            }
 
            request.Method = "POST";    //使用get方式发送数据
            request.ContentType = "application/json";
            request.Referer = null;
            request.AllowAutoRedirect = true;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            request.Accept = "*/*";
            request.Timeout = 1000 * 10;
 
            byte[] data = Encoding.UTF8.GetBytes(postData);
            request.ContentLength = data.Length;
            Stream newStream = request.GetRequestStream();
            newStream.Write(data, 0, data.Length);
            newStream.Close();
 
            //获取网页响应结果
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            string result = string.Empty;
            using (StreamReader sr = new StreamReader(stream))
            {
                result = sr.ReadToEnd();
            }
 
            return result;
        }
 
 
        public static string Post(string url, object postData)
        {
            HttpWebRequest request = null;
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                // 这里设置了协议类型。
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;// SecurityProtocolType.Tls1.2; 
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                ServicePointManager.CheckCertificateRevocationList = true;
                ServicePointManager.DefaultConnectionLimit = 100;
                ServicePointManager.Expect100Continue = false;
 
                X509Certificate cerCaiShang = new X509Certificate(_Config.PfxFile, _Config.CER_CODE);
                request = WebRequest.Create(url) as HttpWebRequest;
                request.ClientCertificates.Add(cerCaiShang);
                request.ProtocolVersion = HttpVersion.Version11;
                request.Timeout = 1000 * 5;
                request.KeepAlive = false;
 
            }
            else
            {
                request = (HttpWebRequest)WebRequest.Create(url);
            }
            var d1 = JsonConvert.SerializeObject(postData);
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(postData.GetType());
            MemoryStream stream = new MemoryStream();
            serializer.WriteObject(stream, postData);
            byte[] dataBytes = new byte[stream.Length];
            stream.Position = 0;
            stream.Read(dataBytes, 0, (int)stream.Length);
            var bs = dataBytes;
 
            request.Method = "POST";    //使用get方式发送数据
            request.ContentType = "application/x-www-form-urlencoded";
            request.Referer = null;
            request.AllowAutoRedirect = true;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            request.Accept = "*/*";
            request.Timeout = 1000 * 5;
 
            request.ContentLength = bs.Length;
            using (Stream reqStream = request.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
            }
          
 
            //获取网页响应结果
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream streamres = response.GetResponseStream();
            //client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            string result = string.Empty;
            using (StreamReader sr = new StreamReader(streamres))
            {
                result = sr.ReadToEnd();
            }
 
            return result;
        }
 
 
        //组装请求参数
        private static string BuildQuery(IDictionary<string, string> parameters, string encode="utf8")
        {
            StringBuilder postData = new StringBuilder();
            bool hasParam = false;
            IEnumerator<KeyValuePair<string, string>> dem = parameters.GetEnumerator();
            while (dem.MoveNext())
            {
                string name = dem.Current.Key;
                string value = dem.Current.Value;
                // 忽略参数名或参数值为空的参数
                if (!string.IsNullOrEmpty(name))
                {
                    if (hasParam)
                    {
                        postData.Append("&");
                    }
                    postData.Append(name);
                    postData.Append("=");
                    if (encode == "gb2312")
                    {
                        postData.Append(Uri.EscapeDataString(value));
                    }
                    else if (encode == "utf8")
                    {
                        postData.Append(Uri.EscapeDataString(value));
                    }
                    else
                    {
                        postData.Append(value);
                    }
                    hasParam = true;
                }
            }
            return postData.ToString();
        }
 
        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受  
        }
    }

调用方法:

            urlData += "&sign="+ Uri.EscapeDataString(data.sign);
            var res = HttpHelper.PostUrl(Config.SERVER_URL, urlData);