C#HttpWebRequest实现文件流的下载
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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