Post/Get方式获取Web页面

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原创文章,转载请注明出处!

作者: 谭剑

博客: http://hi.baidu.com/tanjian

关键字:C#,.NET,Web,页面,浏览,获取,post,get

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有几个弟兄都问过这个问题，干脆把代码帖出来好了。
浏览器浏览Web页面的时候也无非是 post 或者 get  ，带 cookies 或者不带 cookies 这几种方式。
有了下面这几个方法，什么web页面上的自动投票啊，自动查数据啊等等，全部搞定！
有个工具可以让你查看到IE浏览页面时候的通信内容：httplook ， 也顺便推荐一下。


using System.Web;

        /// <summary>
        /// Post方式请求页面
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="postData">post数据</param>
        /// <returns>响应</returns>
        private HttpWebResponse RequestbyPost(string url, string postData)
        {
            Uri lcUri = new Uri(url);
            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);

            //string lcPostData = HttpUtility.UrlEncode(postData, System.Text.Encoding.Default);
            string lcPostData = postData;
            loHttp.Method = "POST";
            loHttp.ContentType = "application/x-www-form-urlencoded";
            loHttp.KeepAlive = true;
            byte[] lbPostBuffer = System.Text.Encoding.Default
                .GetBytes(lcPostData);
            loHttp.ContentLength = lbPostBuffer.Length;
            Stream loPostData = loHttp.GetRequestStream();
            loPostData.Write(lbPostBuffer, 0, lbPostBuffer.Length);
            loPostData.Close();

            return (HttpWebResponse)loHttp.GetResponse();
        }

        /// <summary>
        /// Post方式请求页面
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="postData">post数据</param>
        /// <returns>响应</returns>
        private HttpWebResponse RequestbyPost(string url, string postData, string cookieHeader)
        {
            Uri lcUri = new Uri(url);
            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);

            //string lcPostData = HttpUtility.UrlEncode(postData, System.Text.Encoding.Default);
            string lcPostData = postData;
            loHttp.Method = "POST";
            loHttp.ContentType = "application/x-www-form-urlencoded";
            CookieContainer cookie1 = new CookieContainer();
            loHttp.CookieContainer = cookie1;
            loHttp.CookieContainer.SetCookies(lcUri, cookieHeader);
            loHttp.KeepAlive = true;
            byte[] lbPostBuffer = System.Text.Encoding.Default
                .GetBytes(lcPostData);
            loHttp.ContentLength = lbPostBuffer.Length;
            Stream loPostData = loHttp.GetRequestStream();
            loPostData.Write(lbPostBuffer, 0, lbPostBuffer.Length);
            loPostData.Close();

            return (HttpWebResponse)loHttp.GetResponse();
        }


        /// <summary>
        /// Get方式请求页面
        /// </summary>
        /// <param name="url">地址</param>
        /// <returns>响应</returns>
        private HttpWebResponse RequestbyGet(string url)
        {
            Uri lcUri = new Uri(url);
            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);
            loHttp.Method = "GET";
            //loHttp.ContentType = "application/x-www-form-urlencoded";

            return (HttpWebResponse)loHttp.GetResponse();
        }

        /// <summary>
        /// Get方式请求页面
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="cookieHeader">cookieHeader</param>
        /// <returns>响应</returns>
        private HttpWebResponse RequestbyGet(string url, out string cookieHeader)
        {
            Uri lcUri = new Uri(url);
            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);
            loHttp.Method = "GET";
            //loHttp.ContentType = "application/x-www-form-urlencoded";
            loHttp.AllowAutoRedirect = true;
            loHttp.CookieContainer = new CookieContainer();
            loHttp.KeepAlive = true;
            HttpWebResponse httpWebResponse = (HttpWebResponse)loHttp.GetResponse();
            cookieHeader = loHttp.CookieContainer.GetCookieHeader(lcUri);

            return httpWebResponse;
        }