真爱无限的知识驿站

场景

现在公司的测试环境一些文本日志不让接触，提供一个网络http服务器让人直接访问，这文件大时，一般10MB一个文件，不在同一局域网，网速限制200K，要等很久，访问很慢。

.Net代码请求文本文件最新内容（类似于tail文件）

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                //var FileLength = 0L;
                //var sPosstion = 0;
                int CompletedLength = 0;
                var filePath = ConfigurationManager.AppSettings["txtfilepath"].ToString();
                Console.WriteLine("网络txt文件路径:{0}", filePath);
                var lengthRequest = (HttpWebRequest)HttpWebRequest.Create(filePath);
                lengthRequest.Method = "HEAD";//只获取文件头，不获取内容，速度快
                var ContentLength = ((HttpWebResponse)lengthRequest.GetResponse()).ContentLength;
                try
                {
                    lengthRequest.Abort();
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                var getLastLength = Convert.ToInt32(ConfigurationManager.AppSettings["getLastLength"].ToString());
                HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(filePath);
                if (ContentLength > getLastLength)
                {
                    myRequest.AddRange((int)(ContentLength - getLastLength));//设置Range值
                }
                //向服务器请求，获得服务器的回应数据流
                HttpWebResponse webResponse = (HttpWebResponse)myRequest.GetResponse();
                //FileLength = webResponse.ContentLength + sPosstion;//文件大小=已下载的+服务器返回的
                Stream myStream = webResponse.GetResponseStream();
                byte[] btContent = new byte[getLastLength];
                //Save();//保存下载信息
                if ((CompletedLength = myStream.Read(btContent, 0, getLastLength)) > 0)
                {
                    Console.WriteLine(Encoding.UTF8.GetString(btContent));
                    // FStream.Write(btContent, 0, CompletedLength);
                    //DownloadedLength += CompletedLength;
                    //if (BeStop == true) break;
                }
                else
                {
                    Console.WriteLine("无内容");
                }
                //FStream.Close();
                myStream.Close();
                Console.WriteLine("最后刷新时间："+DateTime.Now.ToString("yyyy-MM-dd HH:m:ss.fff"));
                Console.WriteLine("\r\n---------按任意键刷新----------");
                Console.ReadKey();
                Console.Clear();
            }
        }
    }
}

config文件配置：

  <appSettings>
    <add key="txtfilepath" value="http://www.text.com/Info/Info.log"/>
    <add key="getLastLength" value="2048"/>
  </appSettings>

  运行效果，不到1秒就出来了，刷新快