asp.net 文件上传和下载管理源码

利用asp.net进行文件上传和下载时非常常用的功能，现做整理，将源码上传，提供给初学者参考，以下代码中的样式文件就不上传了，下载者请将样式去掉。

效果图如下：

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

<!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>文件上传管理</title>
    <link href="../themes/common.css" rel="stylesheet" type="text/css" />
    <link href="../themes/reset.css" rel="stylesheet" type="text/css" />
    <link href="../themes/modules.css" rel="stylesheet" type="text/css" />
    <link href="../themes/fix.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div class="right">
        <table cellpadding="1" cellspacing="1" class="tablesingle" width="100%" style=" height:500px;">
            <tr>
                <td colspan="3">
                    <asp:Label ID="lab_FolderInfo" runat="server" Font-Size="Medium"></asp:Label>
                </td>
            </tr>
            <tr>
                <td class="tablesingletdlable"  valign="top" align="center">
                    允许上传文件的类型：
                    <asp:BulletedList ID="bl_FileTypeLimit" runat="server">
                    </asp:BulletedList>
                    允许上传单个文件的大小：
                    <asp:Label ID="lab_FileSizeLimit" runat="server" Text=""></asp:Label>
                </td>
                <td class="tablesingletdlable" align="left">
                    <asp:FileUpload ID="FileUpload" runat="server" Width="300px" /><br /><br />
                    <asp:Button ID="btn_Upload" runat="server" CssClass="button-add-new" Style="height: 26px;
                        width: 64px; border: 0px;" Text="上传文件" OnClick="btn_Upload_Click" />
                </td>
                <td class="tablesingletdlable">
                    <table cellpadding="1" cellspacing="1" class="tablesingle" width="100%">
                        <tr>
                            <td>
                                <!--启用了AutoPostBack-->
                                <asp:ListBox ID="lb_FileList" runat="server" AutoPostBack="True" Width="300px" Height="400px"
                                    OnSelectedIndexChanged="lb_FileList_SelectedIndexChanged"></asp:ListBox>
                            </td>
                            <td valign="top">
                                <asp:Label ID="lab_FileDescription" runat="server" Text=""></asp:Label>
                            </td>
                        </tr>
                        <tr>
                            <td colspan="2">
                                <asp:Button ID="btn_Download" runat="server" CssClass="button-add-new" Style="height: 26px;
            width: 64px; border: 0px;" Text="下载文件" OnClick="btn_Download_Click" /> 
                                <!--在删除前给予确认-->
                                <asp:Button ID="btn_Delete" runat="server" CssClass="button-add-new" Style="height: 26px;
            width: 64px; border: 0px;" Text="删除文件" OnClientClick="return confirm('确定删除文件吗？')"
                                    OnClick="btn_Delete_Click" /><br />
                                <asp:TextBox ID="tb_FileNewName" runat="server" Width="300px"></asp:TextBox> 
                                <asp:Button ID="btn_Rename" runat="server" CssClass="button-4" Style="height: 26px;
            width: 110px; border: 0px;" Text="对文件重命名" OnClick="btn_Rename_Click" /> 
                            </td>
                        </tr>
                    </table>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using System.Configuration;
using SYIT.Tools.DotNetUI;

public partial class NewsManagement_FileUploadManager : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //防止PostBack后列表信息重复添加
        if (!IsPostBack)
        {
            //初始化文件夹信息
            InitFolderInfo();
            //初始化上传限制信息
            InitUploadLimit();
            //初始化文件列表
            InitFileList();
        }
    }

    protected void btn_Upload_Click(object sender, EventArgs e)
    {
        //判断用户是否选择了文件
        if (FileUpload.HasFile)
        {
            //调用自定义方法判断文件类型是否符合要求
            if (IsAllowableFileType())
            {
                //调用自定义方法判断文件大小是否符合要求
                if (IsAllowableFileSize())
                {
                    //从config中读取文件上传路径
                    string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
                    //从UploadFile中读取文件名
                    string strFileName = FileUpload.FileName;
                    //组合成物理路径
                    string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
                    //保存文件
                    FileUpload.SaveAs(strFilePhysicalPath);
                    //更新文件列表框控件
                    lb_FileList.Items.Add(strFileName);
                    //更新文件夹信息
                    InitFolderInfo();
                    //调用自定义方法显示提示
                    ShowMsgHelper.AlertMsg2("文件成功上传！");
                    //ShowMessageBox("文件成功上传");
                }
                else
                {
                    //调用自定义方法显示提示
                    
                    ShowMessageBox("文件大小不符合要求，请参看上传限制");
                }
            }
            else
            {
                //调用自定义方法显示提示
               
                ShowMessageBox("文件类型不符合要求，请参看上传限制");
            }
        }
        else
        {
            //调用自定义方法显示提示
           
            ShowMessageBox("请选择一个文件");
        }
    }

    protected void btn_Download_Click(object sender, EventArgs e)
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //从列表框控件中读取选择的文件名
        string strFileName = lb_FileList.SelectedValue;
        //组合成物理路径
        string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
        //清空输出流
        Response.Clear();
        //在HTTP头中加入文件名信息
        Response.AddHeader("Content-Disposition", "attachment;FileName=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8));
        //定义输出流MIME类型为
        Response.ContentType = "application/octet-stream";
        //从磁盘读取文件流
        System.IO.FileStream fs = System.IO.File.OpenRead(strFilePhysicalPath);
        //定义缓冲区大小
        byte[] buffer = new byte[102400];
        //第一次读取
        int i = fs.Read(buffer, 0, buffer.Length);
        //如果读取的字节大于0，则使用BinaryWrite()不断向客户端输出文件流
        while (i > 0)
        {
            Response.BinaryWrite(buffer);
            i = fs.Read(buffer, 0, buffer.Length);
        }
        //关闭磁盘文件流
        fs.Close();
        //关闭输出流
        Response.End();
    }

    protected void btn_Delete_Click(object sender, EventArgs e)
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //从列表框控件中读取选择的文件名
        string strFileName = lb_FileList.SelectedValue;
        //组合成物理路径
        string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
        //删除文件
        System.IO.File.Delete(strFilePhysicalPath);
        //更新文件列表框控件
        lb_FileList.Items.Remove(lb_FileList.Items.FindByText(strFileName));
        //更新文件夹信息
        InitFolderInfo();
        //更新文件描述信息
        tb_FileNewName.Text = "";
        //更新重命名文本框
        lab_FileDescription.Text = "";
        //调用自定义方法显示提示
      
        ShowMessageBox("文件成功删除");
    }

    protected void btn_Rename_Click(object sender, EventArgs e)
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //从列表框控件中读取选择的文件名
        string strFileName = lb_FileList.SelectedValue;
        //从重命名文本框中读取新文件名
        string strFileNewName = tb_FileNewName.Text;
        //组合成物理路径
        string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
        //组合成物理路径
        string strFileNewPhysicalPath = Server.MapPath(strFileUploadPath + strFileNewName);
        //文件重命名
        System.IO.File.Move(strFilePhysicalPath, strFileNewPhysicalPath);
        //找到文件列表框控件中的匹配项
        ListItem li = lb_FileList.Items.FindByText(strFileName);
        //修改文字
        li.Text = strFileNewName;
        //修改值
        li.Value = strFileNewName;
        //调用自定义方法显示提示
       
        ShowMessageBox("文件成功重命名");
    }

    protected void lb_FileList_SelectedIndexChanged(object sender, EventArgs e)
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //从列表框控件中读取选择的文件名
        string strFileName = lb_FileList.SelectedValue;
        //组合成物理路径
        string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
        //根据物理路径实例化文件信息类
        FileInfo fi = new FileInfo(strFilePhysicalPath);
        //获得文件大小和创建时间并赋值给标签
        lab_FileDescription.Text = string.Format("文件大小：{0} 字节<br><br>上传时间：{1}<br>", fi.Length, fi.CreationTime);
        //把文件名赋值给重命名文本框
        tb_FileNewName.Text = strFileName;
    }

    private void InitFolderInfo()
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //判断上传文件夹是否存在
        if (!Directory.Exists(Server.MapPath(strFileUploadPath)))
            Directory.CreateDirectory(Server.MapPath(strFileUploadPath));
        //组合成物理路径
        string strFilePath = Server.MapPath(strFileUploadPath);
        //从config中读取文件夹容量限制
        double iFolderSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FolderSizeLimit"]);
        //声明表示文件夹已用空间的变量并赋初始值
        double iFolderCurrentSize = 0;
        //获取文件夹中所有文件
        FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles();
        //累加文件大小获得已用空间值
        foreach (FileInfo fi in arrFiles)
            iFolderCurrentSize += Convert.ToInt32(fi.Length / 1024);
        //把文件夹容量和已用空间信息赋值给标签
        lab_FolderInfo.Text = string.Format("文件夹容量限制：{0} M 已用空间：{1:f2} M", iFolderSizeLimit / 1024, iFolderCurrentSize / 1024);
    }

    private void InitUploadLimit()
    {
        //从config中读取上传文件类型限制并根据逗号分割成字符串数组
        string[] arrFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString().Split(',');
        //从config中读取上传文件大小限制
        double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]);
        //遍历字符串数组把所有项加入项目编号控件
        for (int i = 0; i < arrFileTypeLimit.Length; i++)
            bl_FileTypeLimit.Items.Add(arrFileTypeLimit[i].ToString());
        //把文件大小限制赋值给标签
        lab_FileSizeLimit.Text = string.Format("{0:f2} M", iFileSizeLimit / 1024);
    }

    private void InitFileList()
    {
        //从config中读取文件上传路径
        string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
        //组合成物理路径
        string strFilePath = Server.MapPath(strFileUploadPath);
        //读取文件夹下所有文件
        FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles();
        //把文件名逐一添加到列表框控件控件
        foreach (FileInfo fi in arrFiles)
            lb_FileList.Items.Add(fi.Name);
    }

    private bool IsAllowableFileSize()
    {
        //从config中读取上传文件大小限制
        double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]) * 1024;
        //文件大小是否超出了大小限制？
        if (iFileSizeLimit > FileUpload.PostedFile.ContentLength)
            return true;
        else
            return false;
    }

    private bool IsAllowableFileType()
    {
        //从config中读取上传文件类型限制
        string strFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString();
        //当前文件扩展名是否能在这个字符串中找到？
        if (strFileTypeLimit.IndexOf(Path.GetExtension(FileUpload.FileName).ToLower()) > -1)
            return true;
        else
            return false;
    }

    private void ShowMessageBox(string strMessaage)
    {
        ClientScript.RegisterStartupScript(this.GetType(), "", string.Format("<script>alert('{0}')</script>", strMessaage));
    }
}

===========================================================================

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