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aspx 文件上传和下载,多文件上传

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MultiFileUpload.aspx.cs"
  Inherits="MultiFileUpload"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>孟宪会多文件上传测试</title>

  <script type="text/javascript">
    function addFile() {
      var div = document.createElement("div");
      var f = document.createElement("input");
      f.setAttribute("type", "file")
      f.setAttribute("name", "File")
      f.setAttribute("size", "50")
      div.appendChild(f)
      var d = document.createElement("input");
      d.setAttribute("type", "button")
      d.setAttribute("onclick", "deteFile(this)");
      d.setAttribute("value", "移除")
      div.appendChild(d)
document.getElementById("_container").appendChild(div);
    }

    function deteFile(o) {
      while (o.tagName != "DIV") o = o.parentNode;
      o.parentNode.removeChild(o);
    }
  </script>

</head>
<body>
  <form id="form1" runat="server" method="post" enctype="multipart/form-data">
  <h3>多文件上传</h3>
   用户名:<asp:TextBoxID="TextBox1" runat="server"></asp:TextBox>
  <div id="_container">
    <input type="file" size="50" name="File"/>
  </div>
  <div>
    <input type="button" value="http://www.mamicode.com/添加文件(Add)" onclick="addFile()"/>
  </div>
  <div style="padding:10px 0">
    <asp:Buttonrunat="server" Text="开始上传" ID="UploadButton"
      onclick="UploadButton_Click"></asp:Button>
  </div>
  <div>
    <asp:Label ID="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt"
      Width="500px" BorderStyle="None" BorderColor="White"></asp:Label>
  </div>
  </form>
</body>
</html>

C#代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

publicpartialclass MultiFileUpload : System.Web.UI.Page
{
    protectedvoid UploadButton_Click(object sender, EventArgs e)
    {
      ///‘遍历File表单元素
      HttpFileCollection files = HttpContext.Current.Request.Files;

      /// ‘状态信息
      System.Text.StringBuilder strMsg = new System.Text.StringBuilder("您输入的用户名是:" + TextBox1.Text +"<br/>");
      strMsg.Append("上传的文件分别是:<hr color=‘red‘/>");
      try
      {
        for (int iFile =0; iFile < files.Count; iFile++)
        {
          ///‘检查文件扩展名字
          HttpPostedFile postedFile = files[iFile];
          string fileName, fileExtension;
          fileName = System.IO.Path.GetFileName(postedFile.FileName);
          if (fileName !="")
          {
            fileExtension = System.IO.Path.GetExtension(fileName);
            strMsg.Append("上传的文件类型:" + postedFile.ContentType.ToString() +"<br>");
            strMsg.Append("客户端文件地址:" + postedFile.FileName +"<br>");
            strMsg.Append("上传文件的文件名:" + fileName +"<br>");
            strMsg.Append("上传文件的扩展名:" + fileExtension +"<br><hr>");
            ///‘可根据扩展名字的不同保存到不同的文件夹
            ///注意:可能要修改你的文件夹的匿名写入权限。
            postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName);
          }
        }
        strStatus.Text = strMsg.ToString();
      }
      catch (System.Exception Ex)
      {
        strStatus.Text = Ex.Message;
      }

    }
}

下载

public void Download(string path) //要下载文件的名称
{  比如string path = "\\images\\a.text";自己检查自己的路径问题,有的需要添加上级目录 有的直接输入文件名就可
       if (!string.IsNullOrEmpty(path))            {                       string filePath = Server.MapPath("")+path;//路径                  // string filePath =@"C:\Users\Public\Pictures\Sample Pictures\1.jpg";           FileInfo fileInfo = new FileInfo(filePath);                    Response.Clear();                           Response.ClearContent();                      Response.ClearHeaders();                          Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);               Response.AddHeader("Content-Length", fileInfo.Length.ToString());                             Response.AddHeader("Content-Transfer-Encoding", "binary");                           Response.ContentType = "application/octet-stream";                              Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");              Response.WriteFile(fileInfo.FullName);                        Response.Flush();                          Response.End();                    }
}