以POST方式推送JSON数据，并接收返回的服务器消息

  private static string GetResult(string jsonString, string type)
        {
            string url = GetUrl(type);
            string result = "";
            string data = "jsonStr=" + jsonString;//这个是传入的参数格式大致为要求参数名  比如此方法要求Json的这个参数名为data 
            System.Net.ServicePointManager.DefaultConnectionLimit = 200;//设置线程个数
            //todo:考虑记录日志的方法,这里日志建议放入专用的记日志文件夹
            byte[] postData = Encoding.UTF8.GetBytes(data);
            System.GC.Collect();//先设置垃圾回收，防止因request资源过多产生超时现象
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;// url为接口地址，建议传入type后通过方法获取
            request.Method = "POST";
            request.KeepAlive = false;
            request.AllowAutoRedirect = true;
            request.ContentType = "application/x-www-form-urlencoded";
            request.UserAgent =
                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR  3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
            //request.ContentLength = postData.Length;
            request.Timeout = 300000;
            request.ServicePoint.Expect100Continue = false;
            // 提交请求数据  
            Stream outputStream = request.GetRequestStream();
            outputStream.Write(postData, 0, postData.Length);
            outputStream.Close();
            //获取返回值 
            StreamReader reader;
            var response = request.GetResponse() as HttpWebResponse;
            var responseStream = response.GetResponseStream();
            responseStream.ReadTimeout = 300000;//设置读取时间
            reader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));
            string srcString = "";
            try
            {
                //流的读取方式
                srcString = reader.ReadToEnd();
                result = srcString; //返回值赋值 
                //todo:考虑记录日志的方法
            }
            catch (IOException ex)
            {
                throw ex;//todo:考虑记录日志的方法
            }
            finally
            {
                if (responseStream != null)
                {
                    responseStream.Close();
                    responseStream = null;
                }
                if (reader != null)
                {
                    reader.Close();
                }
                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }
            }
            return result;
        }