效果图
上传文件页面：
下载文件页面：
1、母版页site.Master
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="upAndDown.SiteMaster" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html
xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<link href="~/Styles/Site.
CSS" rel="stylesheet" type="text/css" />
<
asp:ContentPlaceHolder ID="HeadContent" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form runat="server">
<div class="page">
<div class="header">
<div class="title">
<h1>
</h1>
</div>
<div class="loginDisplay">
-by Leon</div>
<div class="clear hideSk
iplink">
<asp:Menu ID="NavigationMenu" runat="server" CssClass="menu"
EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal"
>
<Items>
<asp:MenuItem NavigateUrl="~/Default.aspx" Text="上传"/>
<asp:MenuItem NavigateUrl="~/Download.aspx" Text="下载"/>
</Items>
</asp:Menu>
</div>
</div>
<div class="main">
<asp:ContentPlaceHolder ID="MainContent" runat="server"/>
</div>
<div class="clear">
</div>
</div>
<div class="footer">
</div>
</form>
</body>
</html>
2、Default.aspx 上传页面
<%@ Page Title="文件上传与下载" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="upAndDown._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2>
上传文件到服务器</h2>
<h2>
<asp:FileUpload ID="FileUpload1" runat="server" />
</h2>
<p>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="上传" style="margin-left:170px;" />
</p>
</asp:Content>
3、Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace upAndDown
{
public partial class _Default : System.Web.UI.Page
{
PRotected void Page_Load(object sender, EventArgs e)
{
}
public Boolean UpLoad(string path, FileUpload fileupload)
{
bool fileOK = false;
if(fileupload.HasFile)
{
string fileException = System.IO.Path.GetExtension(fileupload.FileName).ToLower();
//上传文件的格式
string[] allowedException = {".xls",".doc",".mp3",".rar",".zip",".vsd",".txt",".jpg",".gif",".bmp"
,".png",".swf",".avi",".mp3",".rm",".wma",".wmv",".exe"};
for (int i = 0; i < allowedException.Length;i++ )
{
if (fileException == allowedException[i])
fileOK = true; //返回成功标识
}
}
if (fileOK) //判断上传的文件是否在指定的格式范围之内
{
//判断文件是否存在，如不存在则创建路径
if (System.IO.Directory.Exists(path))
{
//该目录存在，则将上传的文件保存在该目录当中
}
else
{
System.IO.Directory.CreateDirectory(path); //创建文件路径
}
fileupload.SaveAs(path + "//" + fileupload.FileName.Trim().Replace(" ","")); //去掉文件名字符空格，执行文件上传操作
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "name", "<script>alert('文件上传成功！')</script>");
}
else
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert('hehh')", "<script>alert('不支持此格式文件上传！')</script>");
}
return fileOK;
}
protected void Button1_Click(object sender, EventArgs e)
{
string FilePath = "";
//是否有上传文件
if (this.FileUpload1.FileName != null && this.FileUpload1.FileName != "")
{
if (FileUpload1.PostedFile.ContentLength <= 0)
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert('hehh')", "<script>alert('上传文件为空文件，请重新选择！')</script>");
return;
}
else
{
if (this.FileUpload1.HasFile)
{
if (FileUpload1.PostedFile.ContentLength > 524288000)
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "scriptName", "<script>alert('上传文件过大！')</script>");
return;
}
else
{
FilePath = Server.MapPath("/Images"); //设置服务器路径
}
UpLoad(FilePath, this.FileUpload1);//调用UpLoad()函数上传文件
}
}
}
//如果上传文件错误，则返回操作
else
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "name", "<script>alert('文件为空，请先选择要上传的文件！')</script>");
return;
}
}
}
}
4、Download.aspx 下载页面
<%@ Page Title="文件下载" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="Download.aspx.cs" Inherits="upAndDown.Download" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2 style="font-size: xx-large">
从服务器上下载文件</h2>
<p>
<asp:ListBox ID="ListBox1" runat="server" Height="249px" Width="541px">
</asp:ListBox>
</p>
<embed style="filter: xray()" src="Images/GEM.mp3" width="188" height="68" type="audio/mp3"
loop="true" showstatusbar="true" autostart="true"/>
<p>
<asp:Button ID="Button1" runat="server" Font-Bold="True" Font-Size="Small" Font-Strikeout="False" Text="下载" onclick="Button1_Click" />
</p>
</asp:Content>
5、Download.aspx.cs
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace upAndDown
{
public partial class Download : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//页面加载时，获取下载文件的存放目录
string strfilepath = Server.MapPath("~/Images/");
//创建目录对象
DirectoryInfo dir = new DirectoryInfo(strfilepath);
//获得该目录下的所有文件
FileSystemInfo[] files = dir.GetFileSystemInfos();
//讲遍历的文件名称显示在ListBox控件中
ListItem items;
foreach (FileSystemInfo infofiles in files)
{
items = new ListItem(); //声明一个ListItem对象
items.Text = infofiles.Name;
items.Value = infofiles.FullName;
ListBox1.Items.Add(items); //向ListBox控件中添加数据信息
}
}
}
//<summary>
//文件下载函数
//</summary>
//author Leon
//<param name="fileURL">要下载文件所在的路径</param>
protected Boolean DownLoad(string fileURL)
{
Boolean Dok = false;
try
{
string FullPathURL = Server.MapPath(fileURL);//获取文件下载路径
System.IO.FileInfo file = new System.IO.FileInfo(FullPathURL);
if (file.Exists) //判断要下载的文件是否存在
{
Response.Clear(); //清空response对象中的内容
//*修改前的做法
Response.AddHeader("Content-Disposition", "attachment;filename=" + file.Name);
//*修改后的做法
Response.AddHeader("Content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(file.Name));
Response.AddHeader("Content-Length", file.Length.ToString());
Response.WriteFile(FullPathURL); //通过对Response对象执行下载文件的操作
Response.End(); //结束Response对象
Response.Flush(); //刷新Response对象
Response.Clear(); //清空response对象中的内容
Dok = true;
}
else
{
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"success","<script>alert('文件不存在！')</script>");
}
}
catch (Exception)
{
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件不存在！')</script>");
}
return Dok;
}
protected void Button1_Click(object sender, EventArgs e)
{
//获取下载文件的路径
string downfiles;
try
{
downfiles = "Images/" + ListBox1.SelectedItem.Text;
DownLoad(downfiles);
}
catch (Exception)
{
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('选择文件为空，请先选择要下载的文件！')</script>");
}
}
}
}
注：ASP.NET框架默认最大上传文件为4M，如果要修改框架默认最大上传文件大小， 需要到C:/Windows/Microsoft.NET/Framework/v4.0.30319/Config文件夹中修改machine.config文件，在<system.web> 标签中加入或修改<httpRuntime maxRequestLength="4096000"/>的值。
