提供一个url ，下载到指定的位置. 摘录开源驰骋工作流引擎的BP框架里， 稳定应用。

 /// <summary>

/// Http下载文件

        /// </summary>

        public static string HttpDownloadFile(string url, string path)

        {

//设置参数

            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

//发送请求并获取相应回应数据

            HttpWebResponse response = request.GetResponse() as HttpWebResponse;

//直到request.GetResponse()程序才开始向目标网页发送Post请求

            Stream responseStream = response.GetResponseStream();

//创建本地文件写入流

            Stream stream = new FileStream(path, FileMode.Create);

            byte[] bArr = new byte[1024];

            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();

            responseStream.Close();

            return path;

        }

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