使用.NET实现断点续传
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static void Main(string[] args)
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{
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string StrFileName="c:\\aa.zip"; //根据实际情况设置
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string StrUrl="http://www.xxxx.cn/xxxxx.zip"; //根据实际情况设置
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//打开上次下载的文件或新建文件
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long lStartPos =0;
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System.IO.FileStream fs;
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if (System.IO.File.Exists(StrFileName))
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{
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fs= System.IO.File.OpenWrite(StrFileName);
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lStartPos=fs.Length;
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fs.Seek(lStartPos,System.IO.SeekOrigin.Current); //移动文件流中的当前指针
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}
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else
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{
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fs = new System.IO.FileStream(StrFileName,System.IO.FileMode.Create);
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lStartPos =0;
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}
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//打开网络连接
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try
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{
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System.Net.HttpWebRequest request =(System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(StrUrl);
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if ( lStartPos>0)
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request.AddRange((int)lStartPos); //设置Range值
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//向服务器请求,获得服务器回应数据流
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System.IO.Stream ns= request.GetResponse().GetResponseStream();
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byte[] nbytes = new byte[512];
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int nReadSize=0;
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nReadSize=ns.Read(nbytes,0,512);
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while( nReadSize >0)
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{
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fs.Write(nbytes,0,nReadSize);
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nReadSize=ns.Read(nbytes,0,512);
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}
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fs.Close();
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ns.Close();
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Console.WriteLine("下载完成");
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}
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catch(Exception ex)
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{
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fs.Close();
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Console.WriteLine("下载过程中出现错误:"+ex.ToString());
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}
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}
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