初學抓包之登錄

最近一直忙於學習抓包  一直沒有更新博客   要抓取別人的得數據  首先 要進入他們的網站  所以我就用客戶端模擬瀏覽器登錄   那么就要用到htmlagliitypack這個庫了  可以在vs里面直接安裝  you最新的版本

            private CNNWebClient webClient；
            HtmlDocument html = new HtmlDocument();
            string loginHtml = webClient.DownloadString("xxxxxx");//登錄的網址
            html.LoadHtml(loginHtml);
            //判斷登錄是否有效
            HtmlNode success = html.DocumentNode.SelectSingleNode("//*[@id=\"wrapper\"]/div[1]/div[2]/div/div[2]/a[2]");
            //若登錄還有效直接返回登錄成功
            if (success != null)
                return new HttpMessage() { Reslut = success.InnerText };
            //*[@id="fm1"]/div[4]/input[1]
            string lt = html.DocumentNode.SelectSingleNode("//*[@id=\"fm1\"]/div[4]/input[1]").Attributes["value"].Value;//htmlagliitypack的屬性獲取網頁上的值
            string execution = html.DocumentNode.SelectSingleNode("//*[@id=\"fm1\"]/div[4]/input[2]").Attributes["value"].Value;
            string postData = string.Format("username={2}&password={3}&remember=1&lt={0}&execution={1}&_eventId=submit"
                             , lt, execution, UserName, HttpUtility.UrlDecode(PassWord));//格式化字符串  用於提交
            
             webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//post提交必須加這個 
             webClient.Headers.Add("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)");

            string postHtml = webClient.UploadString("xxxxxxxxxx", postData);//登錄
            webClient.Headers.Add("Content-Type", "text/html;charset=UTF-8");
            HtmlDocument index = new HtmlDocument();
            string indexRes = webClient.DownloadString("http://eip.chinatowercom.cn/");
            index.LoadHtml(indexRes);//加載首頁判斷是否登錄成功
            success = index.DocumentNode.SelectSingleNode("//*[@id=\"wrapper\"]/div[1]/div[2]/div/div[2]/a[2]");

            if (success == null)
                return new HttpMessage() { Reslut = postHtml, State = false };
            else
            {
                //   _addMeaage(string.Format("{0}--登錄成功--", success.InnerText));
                return new HttpMessage() { Reslut = success.InnerText };
            }

　　這是登錄的方法  還有客戶端登錄  保持cookie或者session  這個很重要  

 public class CNNWebClient : WebClient
    {
        private Calculagraph _timer;
        private int _timeOut = 10;
        

        /**/
        /// <summary>
        /// 返回帶有 Cookie 的 HttpWebRequest。
        /// </summary>
        /// <param name="address"></param>
        /// <returns></returns>
        protected override WebRequest GetWebRequest(Uri address)
        {
            WebRequest request = base.GetWebRequest(address);
            if (request is HttpWebRequest)
            {
                HttpWebRequest httpRequest = request as HttpWebRequest;
                httpRequest.CookieContainer = cookieContainer;
                httpRequest.Timeout = 1000 * Timeout;
                httpRequest.ReadWriteTimeout = 1000 * Timeout;
            }
            return request;
        }

        /// <summary>
        /// 過期時間
        /// </summary>
        public int Timeout
        {
            get
            {
                return _timeOut;
            }
            set
            {
                if (value <= 0)
                    _timeOut = 10;
                _timeOut = value;
            }
        }
}gan

　　這就是基本的登錄方法了  希望能給大家一點靈感  對於程序員來說  有時候  一點靈感  足以解決困擾幾天的問題