Asp.Net--下载文件

实现方式1:

    protected void DownLoad_Click(object sender, EventArgs e)

    {

        //获取要下载的文件

        string filename = Server.MapPath("~/upload/计算机科学与技术.rar");

       FileInfo f = new FileInfo(filename);



        //设置文件头

        Response.ContentType = "application/zip";



        //对文件名进行编码处理,并设置保存时的默认文件名

        Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(f.Name, System.Text.Encoding.UTF8));



        //输出文件

        Response.TransmitFile(filename);

        

    }

效果:

实现方式2:

    protected void DownLoad_Click(object sender, EventArgs e)

    {

        //获取要下载的文件

         string file = Server.MapPath("~/upload/DesignPattern.rar");

        FileInfo f = new FileInfo(file);



        //清空缓冲区内容

         Response.Clear();



        //设置文件头

         Response.AddHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlDecode(f.Name,System.Text.Encoding.UTF8));

        Response.AddHeader("Content-Length", f.Length.ToString());

        Response.AddHeader("Content-Transfer-Encoding", "binary");

        Response.ContentType = "application/zip";

        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");



        Response.WriteFile(f.FullName);

        Response.End();

    }

下载中文名文件时存在问题.

效果:

实现方式3:

    protected void DownLoad_Click(object sender, EventArgs e)

    {

        //获取要下载的文件,并将数据读入数组

         string filepath = Server.MapPath("~/upload/DesignPattern.rar");

        FileInfo fi = new FileInfo(filepath);

        FileStream fs = new FileStream(filepath, FileMode.Open);

        int filelength = (int)fs.Length;

        byte[] bt = new byte[filelength];

        fs.Read(bt, 0, filelength);

        fs.Close();



        //设置文件头及保存时的文件名

         Response.ContentType = "application/zip";

        Response.AddHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlDecode(fi.Name,System.Text.Encoding.UTF8));

        Response.AddHeader("Content-Length", filelength.ToString());



        //输出文件

         Response.BinaryWrite(bt);

        Response.Flush();

        Response.End();

    }

下载中文名文件时存在问题.

效果:

实现方式4:

    protected void DownLoad_Click(object sender, EventArgs e)

    {

        string filepath = Server.MapPath("~/upload/DesignPattern.rar");

        FileStream fs = new FileStream(filepath, FileMode.Open);

        int filelength = (int)fs.Length;

        byte[] b = new byte[filelength];

        fs.Read(b, 0, filelength);

        fs.Close();



        Response.ContentType = "application/zip";

        Response.AddHeader("Content-Disposition", "attachment;filename=1.rar");

        Response.AddHeader("Content-Length", filelength.ToString());



        Response.OutputStream.Write(b, 0, filelength);

        Response.OutputStream.Close();

        Response.Flush();

        Response.Close();

    }

实现方式5:

    protected void DownLoad_Click(object sender, EventArgs e)

    {

        //鑾峰彇瑕佷笅杞界殑鏂囦欢,骞跺皢鏁版嵁璇诲叆鏁扮粍

        string filepath = Server.MapPath("~/upload/aspnetmvc-stepbystep.rar");

        FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read);

        long filelength = fs.Length;

        int readsize = 102400;

        byte[] b = new byte[readsize];  



        Response.ContentType = "application/octet-stream";

        Response.AddHeader("Content-Disposition", "attachment;filename=1.rar");

        Response.AddHeader("Content-Length", filelength.ToString());



        while (filelength > 0 && Response.IsClientConnected)

        {

            int receive = fs.Read(b, 0, readsize);

            Response.OutputStream.Write(b, 0, receive);

            Response.Flush();

            b = new byte[readsize];

            filelength = filelength - receive;

        }

        fs.Close();

        Response.OutputStream.Close();

        Response.Close();

    }

注意:

Response.AppendHeader("content-disposition", "attachment;filename=" + filename);//附件下载

Response.AppendHeader("content-disposition", "online;filename=" + filename);//在线打开