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HttpWebRequest 完成Get和Post

2011-09-13 14:28  LoujaDy  阅读(473)  评论(0)  编辑  收藏  举报
  /// <summary>
        /// Get方式请求
        /// </summary>
        /// <param name="getUrl">请求的URL</param>
        /// <param name="cookies">请求时带上的Cookies</param>
        /// <param name="timeOut">请求的超时时间</param>
        /// <param name="userAgent">请求用户的Agent</param>
        /// <returns></returns>
        public static HttpWebResponse HttpGetResponse(string getUrl,int timeOut,string userAgent,string cookiestr)
        {
            //检查URL
            if (string.IsNullOrEmpty(getUrl))
            {
                throw new ArgumentException("请求的URL不能为空！");   
            }

            //创建Request
            HttpWebRequest request = WebRequest.Create(getUrl) as HttpWebRequest;

            //请求方式为Get
            request.Method = "GET";
            request.UserAgent = DefaultUserAgent;

            //用户的UserAgent
            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }

            //如果有超时设定
            if (timeOut > 0)
            {
                request.Timeout = timeOut;
            }

            //设置请求带上的Cookies
            if (!string.IsNullOrEmpty(cookiestr))
            {
                request.Headers["Cookie"] = cookiestr;
            }           
            return request.GetResponse() as HttpWebResponse;
        }

        /// <summary>
        /// Post方式请求
        /// </summary>
        /// <param name="postUrl">post的URL</param>
        /// <param name="parameters">post过去的参数</param>
        /// <param name="timeout">请求超时时间</param>
        /// <param name="userAgent">请的用户的agent</param>
        /// <param name="requestEncoding">请求的编码</param>
        /// <param name="cookiestr">请求要带上的cookie</param>
        /// <returns></returns>
        public static HttpWebResponse HttpPostResponse(string postUrl, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding,string cookiestr)
        {
            if (string.IsNullOrEmpty(postUrl))
            {
                throw new ArgumentNullException("postUrl");
            }
            if (requestEncoding == null)
            {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
       

            //如果是发送HTTPS请求  
            if (postUrl.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback((s, x, xc, e) => { return true; });
                request = WebRequest.Create(postUrl) as HttpWebRequest;
                request.ProtocolVersion = HttpVersion.Version11;
            }
            else
            {
                request = WebRequest.Create(postUrl) as HttpWebRequest;
            }
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
           

            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }
            else
            {
                request.UserAgent = DefaultUserAgent;
            }

            if (timeout.HasValue)
            {
                request.Timeout = timeout.Value;
            }
            if (!string.IsNullOrEmpty(cookiestr))
            {    
                request.Headers["Cookie"] = cookiestr;
            }
            //如果需要POST数据  
            if (!(parameters == null || parameters.Count == 0))
            {
                StringBuilder buffer = new StringBuilder();
                int i = 0;
                foreach (string key in parameters.Keys)
                {
                    if (i > 0)
                    {
                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);
                    }
                    else
                    {
                        buffer.AppendFormat("{0}={1}", key, parameters[key]);
                    }
                    i++;
                }
                byte[] data = requestEncoding.GetBytes(buffer.ToString());
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
           HttpWebResponse hr= request.GetResponse() as HttpWebResponse;
          
           return hr;
        }

作者：Louja
出处：http://loujady.cnblogs.com
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