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