Asp.Net 文件下载1——流下载（适用于大文件且防盗链）（转）

使用流防盗链下载大文件

直接上 Asp.net 后置代码好了

using System;  
using System.Data;  
using System.Configuration;  
using System.Collections;  
using System.Web;  
using System.Web.Security;  
using System.Web.UI;  
using System.Web.UI.WebControls;  
using System.Web.UI.WebControls.WebParts;  
using System.Web.UI.HtmlControls;  
using System.IO;  
  
public partial class FileDownload_Default : System.Web.UI.Page  
{  
    protected void Page_Load(object sender, EventArgs e)  
    {  
  
    }  
  
    //以流方式下载文件，适合大文件  
    protected void btn_down_Click(object sender, EventArgs e)  
    {  
        try  
        {  
            //设置文件名  
            Response.AddHeader("Content-Disposition", "attachment; filename=test.jpg");  
            Response.ContentType = "application/octet-stream";  
  
            //设置下载文件的服务器路径  
            String filePath = "~/FileDownload/test.jpg";  
          
            //输出到流  
            FileStream stream = new FileStream(Server.MapPath(filePath), FileMode.Open, FileAccess.Read, FileShare.Read);  
            BinaryReader reader  = new BinaryReader (stream);  
  
            Response.Clear();  
            while (true)  
            {  
                byte [] bt = reader.ReadBytes(1000);  
                Response.OutputStream.Write(bt,0,1000);  
                if(bt.Length<1000)  
                    break;  
            }  
            reader.Close();  
            stream.Dispose();  
            Response.End();  
        }  
        catch(Exception ex)  
        {  
            this.ClientScript.RegisterStartupScript(this.GetType(),"new","<mce:script type="text/javascript"><!--  
alert('下载文件异常 : "+ex.Message+"');  
// --></mce:script>");  
        }  
    }  
}