asp.net 文件上传和下载管理源码

来源：互联网发布：log4j2 打印sql 编辑：程序博客网时间：2024/05/02 05:03

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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