/// <summary>
        /// Http下载文件
        /// </summary>
        /// <param name="url">文件地址Url</param>
        /// <param name="path">下载成功后文件存放的本地路径</param>
        public static bool HttpDownloadFile(string url, string path)
        {
            try
            {
                // 设置参数
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                //发送请求并获取相应回应数据

                if (request != null)
                {
                    request.AllowAutoRedirect = true;
                    request.CookieContainer = cookie;
                    request.Timeout = 30 * 1000;
                    HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                    if (response != null && (response.StatusCode == HttpStatusCode.NotFound ||
                                             response.StatusCode == HttpStatusCode.InternalServerError ||
                                             response.StatusCode == HttpStatusCode.GatewayTimeout))
                    {
                        return false;
                    }
                    else
                    {
                        string encoding = response.ContentEncoding;
                        if (encoding == null || encoding.Length < 1)
                        {
                            encoding = "UTF-8"; //默认编码  
                        }

                        //直到request.GetResponse()程序才开始向目标网页发送Post请求
                        try
                        {
                            Stream responseStream = response.GetResponseStream();
                            //创建本地文件写入流

                            Stream stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                            byte[] bArr = new byte[1024];

                            if (responseStream != null)
                            {
                                int size = responseStream.Read(bArr, 0, (int)bArr.Length);

                                while (size > 0)
                                {
                                    stream.Write(bArr, 0, size);
                                    size = responseStream.Read(bArr, 0, (int)bArr.Length);
                                }
                            }
                            stream.Close();
                            if (responseStream != null) responseStream.Close();
                            response.Close();
                            request.Abort();

                            return true;
                        }
                        catch (Exception exception)
                        {
                            Logger.Error(exception.ToString());
                            request.Abort();
                            return false;
                        }
                    }
                }
            }
            catch (Exception exception)
            {
                Logger.Error(exception.ToString());
                return false;
            }
            return false;
        }