asp.net文件的上传下载

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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" />  <add key="FileSizeLimit" value="10240" /> <add key="FolderSizeLimit" value="102400" /> </appSettings> <connectionStrings/> <system.web>  <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>  <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>   <asp:Label ID="lab_FolderInfo" runat="server"></asp:Label><br /> <br /> <asp:MultiView ID="mvFolder" runat="server">  <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>  <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>  <asp:View ID="view_Manage" runat="server"> <table cellpadding="5" cellspacing="0" border="0"> <tr> <td>  <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" />  <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" />  </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)); } }

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asp.net文件的上传下载