asp.net文件上传、下载管理的示例代码_Asp.Net编程

asp.net文件上传、下载管理的示例代码: 发布时间：2020-04-19编辑：脚本学堂

分享一例asp.net代码，实现文件的上传与下载管理，有学习asp.net文件上传下载的朋友，可以作个参考，挺不错的。

本节内容：
asp.net实现文件的上传与下载管理。

1，Web.Config 配置文件

复制代码代码示例:

<?xml version="1.0"?>

<configuration>

<appSettings>

   <add key="FileUploadPath" value="Upload/" />

   <add key="FileTypeLimit" value=".zip,.rar,.dox,.ppt,.txt,.mp3" />

   <!--FileSizeLimit和FolderSizeLimit以KB为单位-->

   <add key="FileSizeLimit" value="10240" />

   <add key="FolderSizeLimit" value="102400" />

</appSettings>

<connectionStrings/>

<system.web>

   <!--每次请求最大长度40M，页面执行最长时间60秒-->

   <httpRuntime maxRequestLength="40960" executionTimeout="60" />

   <compilation debug="true"/>

   <authentication mode="Windows"/>

</system.web>

</configuration>

2，页面文件

复制代码代码示例:

<head runat="server">

     <title>网络文件夹</title>

    <style type="text/css">

    /*给body、input和select元素同时应用css*/

    body,input,select

    {

     font-family: "宋体";

     font-size: 10pt;

     font-weight: normal;

     color: #000000;

} 

    </style>

</head>

<body>

    <form id="form1" runat="server">

        <div>

            <!--启用了AutoPostBack-->

            <asp:DropDownList ID="ddl_FunctionList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddl_FunctionList_SelectedIndexChanged">

                <asp:ListItem Value="-1">选择功能</asp:ListItem>

                <asp:ListItem Value="0">上传限制</asp:ListItem>

                <asp:ListItem Value="1">上传文件</asp:ListItem>

                <asp:ListItem Value="2">管理文件</asp:ListItem>

            </asp:DropDownList>

            &nbsp;

            <asp:Label ID="lab_FolderInfo" runat="server"></asp:Label><br />

            <br />

            <asp:MultiView ID="mvFolder" runat="server">

                <!--上传限制界面开始-->

                <asp:View ID="view_Configure" runat="server">

                    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>

                </asp:View>

                <!--上传文件界面开始-->

                <asp:View ID="view_Upload" runat="server">

                    <asp:FileUpload ID="FileUpload" runat="server" Width="400px" />

                    <br />

                    <asp:Button ID="btn_Upload" runat="server" Text="上传文件" OnClick="btn_Upload_Click" />

                </asp:View>

                <!--管理文件界面开始-->

                <asp:View ID="view_Manage" runat="server">

                    <table cellpadding="5" cellspacing="0" border="0">

                        <tr>

                            <td>

                                <!--启用了AutoPostBack-->

                                <asp:ListBox ID="lb_FileList" runat="server" AutoPostBack="True" Width="300px" Height="300px"

                                    OnSelectedIndexChanged="lb_FileList_SelectedIndexChanged"></asp:ListBox>

                            </td>

                            <td valign="top">

                                <asp:Label ID="lab_FileDescription" runat="server" Text=""></asp:Label>

                            </td>

                        </tr>

                    </table>

                    <asp:Button ID="btn_Download" runat="server" Text="下载文件" OnClick="btn_Download_Click" />

                    <!--在删除前给予确认-->

                    <asp:Button ID="btn_Delete" runat="server" 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" Text="对文件重命名" OnClick="btn_Rename_Click" />&nbsp;

                </asp:View>

            </asp:MultiView>

        </div>

    </form>

</body>

</html>

3，后台文件

复制代码代码示例:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class Chapter86_Default7 : 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 ddl_FunctionList_SelectedIndexChanged(object sender, EventArgs e)
    {
        //根据下拉框所选调用合适的页面 www.jb200.com
        mvFolder.ActiveViewIndex = Convert.ToInt16(ddl_FunctionList.SelectedValue);
    }
    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
                    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 www.jb200.com
        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 // www.jb200.com
            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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