C#下载文件及取得Request的返回信息_request 请求下载文件获取不到返回的信息-优快云博客

本文链接：https://blog.youkuaiyun.com/crabo/article/details/547107

博客介绍了使用C#进行页面资源下载的方法。通过HttpWebRequest和WebResponse对象，利用Stream流进行数据传输，将远程资源下载到本地。还展示了返回请求结果时读取响应流的代码，实现了页面资源下载及结果读取功能。

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习惯上可能总觉得提交页面请求,下载页面资源是项繁琐的工作. 其实也不然. 象springframework.net一丫的跟我说的:工程总是看起来比他实际的大:P

http://blog.youkuaiyun.com/crabo/

HttpWebRequest webRequest=null;
WebResponse craboResponse = null;

private void GetImage()
{
#region Download Image
   Stream remoteStream = null;
   Stream localStream = null;
   try
   {
    webRequest = (HttpWebRequest)WebRequest.Create(_imgURL);
    webRequest.CookieContainer = cc;// keep in same session
    if (webRequest != null)
    {
    craboResponse= webRequest.GetResponse();
     if (craboResponse != null)
     {
      remoteStream = craboResponse.GetResponseStream();
      localStream = File.Create(_imgPath);
      byte[] buffer = new byte[1254];
      int bytesRead;
      do
      {
       bytesRead = remoteStream.Read (buffer, 0, buffer.Length);
       localStream.Write(buffer, 0, bytesRead);
      }while (bytesRead > 0);
     }
    }
   }
   finally
   {
    localStream.Close();
   }
   #endregion

}

如果是返回请求结果,则:

craboResponse = (HttpWebResponse)webRequest.GetResponse();
    using(Stream resData = craboResponse.GetResponseStream())
    {
     using(StreamReader reader = new StreamReader(resData, System.Text.Encoding.GetEncoding("GB2312")))
     {
      string _result = reader.ReadToEnd();
    }
}