C#模拟http 发送post或get请求的简单实例

系统管理员 2022-12-03 09:19 90阅读 0赞

private string HttpPost(string Url, string postDataStr) 
        { 
          HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); 
          request.Method = "POST"; 
          request.ContentType = "application/x-www-form-urlencoded"; 
          request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr); 
          request.CookieContainer = cookie; 
          Stream myRequestStream = request.GetRequestStream(); 
          StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312")); 
          myStreamWriter.Write(postDataStr); 
          myStreamWriter.Close(); 
      
          HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
      
          response.Cookies = cookie.GetCookies(response.ResponseUri); 
          Stream myResponseStream = response.GetResponseStream(); 
          StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); 
          string retString = myStreamReader.ReadToEnd(); 
          myStreamReader.Close(); 
          myResponseStream.Close(); 
      
          return retString; 
        } 
      
        public string HttpGet(string Url, string postDataStr) 
        { 
          HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr); 
          request.Method = "GET"; 
          request.ContentType = "text/html;charset=UTF-8"; 
      
          HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
          Stream myResponseStream = response.GetResponseStream(); 
          StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); 
          string retString = myStreamReader.ReadToEnd(); 
          myStreamReader.Close(); 
          myResponseStream.Close(); 
      
          return retString; 
        }

在post的时候有时也用的到cookie，像登录163发邮件时候就需要发送cookie，所以在外部一个cookie属性随时保存 CookieContainer cookie = new CookieContainer();

**注意：**有时候请求会重定向，但我们就需要从重定向url获取东西，像QQ登录成功后获取sid，但上面的会自动根据重定向地址跳转。我们可以用：

request.AllowAutoRedirect = false;设置重定向禁用，你就可以从headers的Location属性中获取重定向地址