文件下载代码,Asp.Net代码库,德仔网

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代码分类
【Asp.Net】文件下载
作者:Dezai.CN / 发布于2013/7/30/ 676

	在你的Page_Load中添加这样的代码:

	Page.Response.Clear();
	bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", @"源文件路径", 1024000);
	if (!success)
	 Response.Write("下载文件出错！");
	Page.Response.End();

	文件下载函数代码为:
	public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
	 {
	 try
	 {
	 FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
	 BinaryReader br = new BinaryReader(myFile);
	 try
	 {
	 _Response.AddHeader("Accept-Ranges", "bytes");
	 _Response.Buffer = false;
	 long fileLength = myFile.Length;
	 long startBytes = 0;
	
	 double pack = 10240; //10K bytes
	 //int sleep = 200; //每秒5次 即5*10K bytes每秒
	 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
	 if (_Request.Headers["Range"] != null)
	 {
	 _Response.StatusCode = 206;
	 string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});
	 startBytes = Convert.ToInt64(range[1]);
	 }
	 _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
	 if (startBytes != 0)
	 {
	 //Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
	 }
	 _Response.AddHeader("Connection", "Keep-Alive");
	 _Response.ContentType = "application/octet-stream";
	 _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
	
	 br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
	 int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;

	 for (int i = 0; i < maxCount; i++)
	 {
	 if (_Response.IsClientConnected)
	 {
	 _Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));
	 Thread.Sleep(sleep);
	 }
	 else
	 {
	 i=maxCount;
	 }
	 }
	 }
	 catch
	 {
	 return false;
	 }
	 finally
	 {
	 br.Close();

	 myFile.Close();
	 }
	 }
	 catch
	 {
	 return false;
	 }
	 return true;
	 }

	这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.

	防止盗链

	protected void Page_Load(object sender, EventArgs e)

	{

	 /*--------------------------------------------------------------*\

	 * 大文件下载，防盗链 *

	 * *

	 * tda7264@163.com *

	 * *

	 * 飘遥的BLOG http://xianfen.net *

	 \* -------------------------------------------------------------*/

	 if (Request.QueryString["FileName"] == null)

	 {

	 InvalidRedirect();

	 }

	

	 string fileName = Request.QueryString["FileName"];

	

	 if (fileName == string.Empty)

	 {

	 InvalidRedirect();

	 }

	 //判断配置文件是否直接下载

	 string downDirect = ConfigurationManager.AppSettings["Down"].ToLower();

	

	 if (downDirect == "true")

	 {

	 UpdateHits(fileName);//更新下载次数

	 Response.Redirect("Upload/" + fileName);

	 return;

	 }

	 string path = Server.MapPath(Request.ApplicationPath + "/Upload/" + fileName);

	 string referrer = string.Empty;

	

	 if (Request.UrlReferrer != null)

	 {

	 referrer = Request.UrlReferrer.ToString().ToLower();

	 }

	 string d = ConfigurationManager.AppSettings["Valid"].ToLower();

	 string[] domainName =
	ConfigurationManager.AppSettings["Refers"].ToLower().Split(new char[] { ',' });

	

	 // 如果设置为防止盗链，判断访问来源是否合法

	 if (d == "false")

	 {

	 foreach (string s in domainName)

	 {

	 if (referrer.IndexOf(s.ToLower()) > 0)

	 {

	 UpdateHits(fileName);//更新下载次数

	 ResponseFile(path);

	 return;

	 }

	 }

	 InvalidRedirect();

	 }

	 else

	 {

	 ResponseFile(path);

	 }

	}

	protected void UpdateHits(string fileName)

	{

	 //更新文件下载次数的代码

	}

	

	protected void InvalidRedirect()

	{

	 string defaultPage = ConfigurationManager.AppSettings["DefaultRedirect"];

	

	 Response.Redirect(defaultPage, true);

	}

	配置文件
	配置文件中配置下载方式、盗链功能是否开启及盗链默认转向的页面地址：

	<appSettings>

	 <add key="Down" value="false"/>

	 <!--是否直接下载-->

	 <add key="Valid" value="false"/>

	 <!--是否允许盗链-->

	 <add key="Refers" value="localhost,google.cn"/>

	 <!--多个允许的访问来源用半角的","分割-->

	 <add key="DefaultRedirect" value="Error.htm"/>

	 <!--默认转向的页面-->

	</appSettings>
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