C#get ,post HttpClient

(1)get  

發送url請求

設置請求方式

設置請求內容格式

獲得回應對象，接收流

讀取流

  private string Get(string url)
        {
            string all = string.Empty;
            //發送請求
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "get";//設置方法
            request.ContentType = "text/html;charset=UTF-8";
            //獲得響應
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            //讀取流
            Stream stream = response.GetResponseStream();
            StreamReader sr = new StreamReader(stream, Encoding.UTF8);
            all= sr.ReadToEnd();
            //關閉流
            stream.Close();
            sr.Close();
            return all;
        }

(2)post

發送url請求

設置請求方式

設置請求內容格式

設置請求內容長度（可以不設置）（長度是byte數組的長度，不是string類型的長度）

將post數據添加到請求流中（重中之重GetRequestStream()）

接收回應對象，接收流

讀取流

 

 public static string Post(string postdata, string url)
        {
            HttpWebResponse hw;
            string result = string.Empty;
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/json";
            #region 添加Post 參數  
            byte[] data = Encoding.UTF8.GetBytes(postdata);
            req.ContentLength = data.Length; using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);//將post對象放入請求流中
                reqStream.Close();
            }
            #endregion
            try
            {
                HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
                Stream stream = resp.GetResponseStream();
                //獲取響應內容  
                using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                {
                    result = reader.ReadToEnd();
                }
            }
            catch (WebException w)
            {
                hw = (HttpWebResponse)w.Response;
                StreamReader sr = new StreamReader(hw.GetResponseStream(), Encoding.UTF8, false);
                result = sr.ReadToEnd();
            }
            return result;
        }

 （2）HttpClient

 string meeturl = "http://www.baidu.cn/?title=";
            StringBuilder s = new StringBuilder();
            string url = meeturl + "m";
            HttpClient client = new HttpClient();
            client.Timeout = new TimeSpan(0,0,2);
             HttpResponseMessage hm=  client.GetAsync(url).Result;//通過html可以獲得返回的多個信息
            s.AppendLine("StatusCode:      "+hm.StatusCode);
            s.AppendLine("GetType().ToString():      " + hm.GetType().ToString());
            s.AppendLine(hm.Content.ReadAsStringAsync().Result);
            textBox1.Text = s.ToString();