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();
                Response.OutputStream.Write(bt,,);
                if(bt.Length<)
                    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>");
        }
    }
}