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asp.net文件的上传下载

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标签:des   style   http   color   使用   os   io   文件   

Web.Config 配置文件 <?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>

页面文件 <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>

后台文件 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         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         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));     } }

asp.net文件的上传下载,布布扣,bubuko.com

asp.net文件的上传下载

标签:des   style   http   color   使用   os   io   文件   

原文地址:http://www.cnblogs.com/lh123/p/3907920.html

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