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HttpWebRequest请求超时异常的处理方法(重新发送请求到成功为止)

 

方法主要有2点:1.在GetResponse()超时后要重新发送请求;2.检查是否异常,捕获或抛掉异常。

publicstring GetHtml(string URI) {

  string fullhtml=null;

  while(true) {

     try {

      HttpWebRequest req = (HttpWebRequest)WebRequest.Create(URI);

      req.Method ="GET";

      req.UserAgent ="Opera/9.25 (Windows NT 6.0; U; en)";

      req.KeepAlive =true; req.Timeout =6000000;

      HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

      if (resp.StatusCode != HttpStatusCode.OK) //如果服务器未响应,那么继续等待相应

          continue;

      StreamReader sr =new StreamReader(resp.GetResponseStream(), Encoding.UTF8);

       fullhtml = sr.ReadToEnd().Trim();

       resp.Close();

      sr.Close();

      break;

    }

    catch (WebException e) {

    e.StackTrace.ToString();

    System.Diagnostics.Trace.WriteLine(e.Message);

    if (true) continue;

    }

  }

return fullhtml;

}

posted on 2012-09-23 00:12  Jason_liu  阅读(9029)  评论(0编辑  收藏  举报