[Files]多文件上传和下载

最近在做一个信息发布系统。要有上传文件和下载的功能

直接上源码：

function addFile()
  {
      var str = ''
      document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
  }

 

 table align="center" class="fullwidth">附件:
		

			

		
提示:长传的附件不能大于6M文件名称:上传作者:备注信息:

protected void btnUpload_Click(object sender, EventArgs e)
    {

        HttpFileCollection files = HttpContext.Current.Request.Files;
        for (int i = 0; i < files.Count; i++)
        {
            if (i < files.Count && i < 10)
            {
                if (files[i].FileName != "" || files[i] != null)
                {
                    int FileSize = 6 * 1024 * 1024;
                    HttpPostedFile myFile = files[i];
                    string strFilePath = myFile.FileName.ToString().Trim();
                    this.lblAttachmentError.Text = "<" + strFilePath + ">"; // Show file name 
                    int nFindSlashPos = strFilePath.Trim().LastIndexOf("//") + 1;
                    string UploadFileName = strFilePath.Substring(nFindSlashPos);
                    string FileName =string.Format("{0:yyMMdd-hhmmss}", DateTime.Now) + "_" + UploadFileName; //this.txtWorkOrder.Text 

                    if (myFile.FileName.Trim() == "") // Empty value in Browse Box
                    {
                        this.lblAttachmentError.Text = "没有文件被选择";
                        return;
                    }

                    if (myFile.ContentLength != 0)
                    {
                        if (myFile.ContentLength > FileSize)
                        {
                            this.lblAttachmentError.Text = "文件大小限制在6M以下";
                            return;
                        }
                        this.lblAttachment.Text += "
" + FileName;
                        this.lblAttachmentError.Text = "";

                        myFile.SaveAs(this.Request.PhysicalApplicationPath.ToString().Trim() + @"/uploads/" + FileName);

                        //保存代码
                        string filename = string.Empty;
                        int  filesize;
                        string filepath = string.Empty;
                        string uploaduser = string.Empty;
                        string remark = string.Empty;

                        filename = txt_filename.Text.Trim();
                        filesize = myFile.ContentLength;
                        filepath = FileName;
                        uploaduser = txt_username.Text.Trim();
                        remark = txt_remark.Text.Trim();

                        string strsql = string.Format("insert onlinedoc(filename,filesize,path,uploaduser,remark)values('{0}',{1},'{2}','{3}','{4}')",filename,filesize,filepath,uploaduser,remark);
                        DABaseAccess db = new DABaseAccess();
                        if (db.GetNonQuery(strsql.ToString()))
                        {
                            JScript.Alert("恭喜你文件上传成功，保存数据库成功！", this.Page);   
                        }
                       else 
                        {
                            JScript.Alert("保存数据库失败，请与管理员龚德辉联系!", this.Page);  
                        }


                    }
                    else
                    {
                        this.lblAttachmentError.Text = "文件没有找到";
                        return;
                    }
                }
            }
            else
                this.lblAttachmentError.Text = "Uploaded File exceed limits.";
        }

    }

这个可以同时上传N个 不过我只传一个。

下载:

protected void btndownload_Click(object sender, ImageClickEventArgs e)
    {
       
        string path = Server.MapPath("uploads/") + this.path; //   Session["file"].ToString();
        //初始化 FileInfo 类的实例，它作为文件路径的包装
        FileInfo fi = new FileInfo(path);
        //判断文件是否存在
        if (fi.Exists)
        {
            //将文件保存到本机上
            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Encoding.UTF8.GetBytes(fi.Name)));
            Response.AddHeader("Content-Length", fi.Length.ToString());
            Response.ContentType = "application/octet-stream";
            Response.Filter.Close();
            Response.WriteFile(fi.FullName);
            Response.End();
        }
     }

编码采用UTF-8所以标题不会乱码