发送HttpWebRequest请求

 下面的实例为发送短信请求至某一api，返回流数据，为json类型

           
            //最终短信返回结果
           static string Res = "";
        //为抛出异常，返回的json字符串对应状态码的结果
           static string resuleJson = "";
        //状态码 代码最后有对应的
           static string stateNum = "";
            //要请求的url地址
            string url = "http://*******";
            //http发送请求及响应
            HttpWebRequest req = null;
            HttpWebResponse response = null;
            Stream writer = null;
            XmlDocument xml = new XmlDocument();
            req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";//发送请求的方法
            req.ContentType = "application/json";
            //要发送的请求体
            string content = "{\"account\":\"admin\",\"password\":\"111111\",\"businessType\":\"6666666\"}";
            Stream myRequestStream = req.GetRequestStream();
            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8"));
            myStreamWriter.Write(content);
            myStreamWriter.Close();

            try
            {
                response = (HttpWebResponse)req.GetResponse();      //获得响应
            }
            catch (WebException ex)
            {
                Log.Info(ex.Message);
                Res = "调用req.GetResponse时：" + ex.Message;
                return;
            }
            //这种方式读取到的是一个返回的结果字符串
            try
            {
                Stream stream = response.GetResponseStream();        //获取响应流
                StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"));
                resuleJson = reader.ReadToEnd();
                reader.Close();
                stream.Close();
            }
            catch (Exception ex)
            {
                Log.Info( ex.Message);
                Res = (ex.Message);
                return;
            }
            //此处代码为将string类型的resuleJson（json格式的字符串）
            //进行获取并对值进行判断
            //使用时项目中引用json.NET
            //代码中引用using Newtonsoft.Json.Linq;
            //才可以使用JObject
            JObject j = JObject.Parse(resuleJson);
            stateNum = j["code"].ToString();
            if (stateNum == "0")
            {
                Res = "success";
                return;
            }