客户端文件的下载

来源：互联网发布：大数据存储技术有哪些编辑：程序博客网时间：2024/06/03 01:09

public void download(string filename)
    {

        string path = Server.MapPath(filename);
        if (!System.IO.File.Exists(path))
        {
            Response.Write("对不起！文件不存在！！");
            return;
        }
        System.IO.FileInfo file = new System.IO.FileInfo(path);
        //string fileFilt = ".asp|.aspx|.php|.jsp|.ascx|.config|.asa|......"; //不可下载的文件，务必要过滤干净
        string tempFileName = file.Name;
        string fileExt = tempFileName.Substring(tempFileName.LastIndexOf(".")).Trim().ToLower();
        //if (fileFilt.IndexOf(fileExt) != -1)
        //{
        //    Response.Write("对不起！该类文件禁止下载！！");
        //}
        //else
        //{
            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(tempFileName));
            Response.AddHeader("Content-Length", file.Length.ToString());
            Response.ContentType = checktype(HttpUtility.UrlEncode(fileExt));
            Response.WriteFile(file.FullName);
            Response.End();
       // }
    }
    ///
    /// 下载类型
    /// fileexp">文件扩展名
    ///
    private string checktype(string fileExt)
    {
        string ContentType;
        switch (fileExt)
        {
            case ".asf":
                ContentType = "video/x-ms-asf"; break;
            case ".avi":
                ContentType = "video/avi"; break;
            case ".doc":
                ContentType = "application/msword"; break;
            case ".zip":
                ContentType = "application/zip"; break;
            case ".xls":
                ContentType = "application/vnd.ms-excel"; break;
            case ".gif":
                ContentType = "image/gif"; break;
            case ".jpg":
                ContentType = "image/jpeg"; break;
            case "jpeg":
                ContentType = "image/jpeg"; break;
            case ".wav":
                ContentType = "audio/wav"; break;
            case ".mp3":
                ContentType = "audio/mpeg3"; break;
            case ".mpg":
                ContentType = "video/mpeg"; break;
            case ".mepg":
                ContentType = "video/mpeg"; break;
            case ".rtf":
                ContentType = "application/rtf"; break;
            case ".html":
                ContentType = "text/html"; break;
            case ".htm":
                ContentType = "text/html"; break;
            case ".txt":
                ContentType = "text/plain"; break;
            default:
                ContentType = "application/octet-stream";
                break;
        }
        return ContentType;