C#HttpWebRequest实现文件流的下载

编程

   public static bool HttpDownload(string url, string path)

{

string tempPath = System.IO.Path.GetDirectoryName(path) + @" emp";

System.IO.Directory.CreateDirectory(tempPath); //创建临时文件目录

string tempFile = tempPath + @"" + System.IO.Path.GetFileName(path) + ".temp"; //临时文件

if (System.IO.File.Exists(tempFile))

{

System.IO.File.Delete(tempFile); //存在则删除

}

try

{

FileStream fs = new FileStream(tempFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);

// 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(tempFile, FileMode.Create);

byte[] bArr = new byte[1024];

int size = responseStream.Read(bArr, 0, (int)bArr.Length);

while (size > 0)

{

//stream.Write(bArr, 0, size);

fs.Write(bArr, 0, size);

size = responseStream.Read(bArr, 0, (int)bArr.Length);

}

//stream.Close();

fs.Close();

responseStream.Close();

System.IO.File.Move(tempFile, path);

return true;

}

catch (Exception ex)

{

return false;

}

}

 

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