京东价格监控软件开发技术探讨二：通过HttpWebRequest获取指定网页数据

京东价格监控软件开发技术探讨二：通过HttpWebRequest获取指定网页数据

C#提供了HttpWebRequest对象来获取指定网页的数据，具体用法如下：

        /// 

        /// 获取网页数据
        /// 
        /// 
        /// "POST" or "GET"
        /// when the method is "POST", the data will send to web server, if the method is "GET", the data should be string.empty
        /// 
        public static string GetResponse(string url, string method, string data)
        {
            try
            {
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                req.KeepAlive = true;
                req.Method = method.ToUpper();
                req.AllowAutoRedirect = true;
                req.CookieContainer = CookieContainers;
                req.ContentType = "application/x-www-form-urlencoded";

                req.UserAgent = IE7;
                req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                req.Timeout = 50000;

                if (method.ToUpper() == "POST" && data != null)
                {
                    ASCIIEncoding encoding = new ASCIIEncoding();
                    byte[] postBytes = encoding.GetBytes(data); ;
                    req.ContentLength = postBytes.Length;
                    Stream st = req.GetRequestStream();
                    st.Write(postBytes, 0, postBytes.Length);
                    st.Close();
                }

                System.Net.ServicePointManager.ServerCertificateValidationCallback += (se, cert, chain, sslerror) =>
                {
                    return true;
                };

                //Encoding myEncoding = Encoding.GetEncoding("UTF-8");
                Encoding myEncoding = Encoding.GetEncoding("gb2312");

                HttpWebResponse res = (HttpWebResponse)req.GetResponse();
                Stream resst = res.GetResponseStream();
                StreamReader sr = new StreamReader(resst, myEncoding);
                string str = sr.ReadToEnd();

                return str;
            }
            catch (Exception)
            {
                return string.Empty;
            }
        }

杀京东 做最走心的京东价格监控软件 免费开源的价格监控软件 欢迎加入QQ群415014949一起讨论