asp.net 檔案上傳和下載管理原始碼
阿新 • • 發佈:2018-11-28
利用asp.net進行檔案上傳和下載時非常常用的功能,現做整理,將原始碼上傳,提供給初學者參考,以下程式碼中的樣式檔案就不上傳了,下載者請將樣式去掉。
效果圖如下:
<%@ 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>檔案上傳管理</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"> 允許上傳檔案的型別: <asp:BulletedList ID="bl_FileTypeLimit" runat="server"> </asp:BulletedList> 允許上傳單個檔案的大小: <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="上傳檔案" OnClick="btn_Upload_Click" /> </td> <td class="tablesingletdlable"> <table cellpadding="1" cellspacing="1" class="tablesingle" width="100%"> <tr> <td> <!--啟用了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="下載檔案" OnClick="btn_Download_Click" /> <!--在刪除前給予確認--> <asp:Button ID="btn_Delete" runat="server" CssClass="button-add-new" Style="height: 26px; width: 64px; border: 0px;" Text="刪除檔案" OnClientClick="return confirm('確定刪除檔案嗎?')" 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="對檔案重新命名" 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後列表資訊重複新增 if (!IsPostBack) { //初始化資料夾資訊 InitFolderInfo(); //初始化上傳限制資訊 InitUploadLimit(); //初始化檔案列表 InitFileList(); } } protected void btn_Upload_Click(object sender, EventArgs e) { //判斷使用者是否選擇了檔案 if (FileUpload.HasFile) { //呼叫自定義方法判斷檔案型別是否符合要求 if (IsAllowableFileType()) { //呼叫自定義方法判斷檔案大小是否符合要求 if (IsAllowableFileSize()) { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //從UploadFile中讀取檔名 string strFileName = FileUpload.FileName; //組合成物理路徑 string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName); //儲存檔案 FileUpload.SaveAs(strFilePhysicalPath); //更新檔案列表框控制元件 lb_FileList.Items.Add(strFileName); //更新資料夾資訊 InitFolderInfo(); //呼叫自定義方法顯示提示 ShowMsgHelper.AlertMsg2("檔案成功上傳!"); //ShowMessageBox("檔案成功上傳"); } else { //呼叫自定義方法顯示提示 ShowMessageBox("檔案大小不符合要求,請參看上傳限制"); } } else { //呼叫自定義方法顯示提示 ShowMessageBox("檔案型別不符合要求,請參看上傳限制"); } } else { //呼叫自定義方法顯示提示 ShowMessageBox("請選擇一個檔案"); } } protected void btn_Download_Click(object sender, EventArgs e) { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //從列表框控制元件中讀取選擇的檔名 string strFileName = lb_FileList.SelectedValue; //組合成物理路徑 string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName); //清空輸出流 Response.Clear(); //在HTTP頭中加入檔名資訊 Response.AddHeader("Content-Disposition", "attachment;FileName=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8)); //定義輸出流MIME型別為 Response.ContentType = "application/octet-stream"; //從磁碟讀取檔案流 System.IO.FileStream fs = System.IO.File.OpenRead(strFilePhysicalPath); //定義緩衝區大小 byte[] buffer = new byte[102400]; //第一次讀取 int i = fs.Read(buffer, 0, buffer.Length); //如果讀取的位元組大於0,則使用BinaryWrite()不斷向客戶端輸出檔案流 while (i > 0) { Response.BinaryWrite(buffer); i = fs.Read(buffer, 0, buffer.Length); } //關閉磁碟檔案流 fs.Close(); //關閉輸出流 Response.End(); } protected void btn_Delete_Click(object sender, EventArgs e) { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //從列表框控制元件中讀取選擇的檔名 string strFileName = lb_FileList.SelectedValue; //組合成物理路徑 string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName); //刪除檔案 System.IO.File.Delete(strFilePhysicalPath); //更新檔案列表框控制元件 lb_FileList.Items.Remove(lb_FileList.Items.FindByText(strFileName)); //更新資料夾資訊 InitFolderInfo(); //更新檔案描述資訊 tb_FileNewName.Text = ""; //更新重新命名文字框 lab_FileDescription.Text = ""; //呼叫自定義方法顯示提示 ShowMessageBox("檔案成功刪除"); } protected void btn_Rename_Click(object sender, EventArgs e) { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //從列表框控制元件中讀取選擇的檔名 string strFileName = lb_FileList.SelectedValue; //從重新命名文字框中讀取新檔名 string strFileNewName = tb_FileNewName.Text; //組合成物理路徑 string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName); //組合成物理路徑 string strFileNewPhysicalPath = Server.MapPath(strFileUploadPath + strFileNewName); //檔案重新命名 System.IO.File.Move(strFilePhysicalPath, strFileNewPhysicalPath); //找到檔案列表框控制元件中的匹配項 ListItem li = lb_FileList.Items.FindByText(strFileName); //修改文字 li.Text = strFileNewName; //修改值 li.Value = strFileNewName; //呼叫自定義方法顯示提示 ShowMessageBox("檔案成功重新命名"); } protected void lb_FileList_SelectedIndexChanged(object sender, EventArgs e) { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //從列表框控制元件中讀取選擇的檔名 string strFileName = lb_FileList.SelectedValue; //組合成物理路徑 string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName); //根據物理路徑例項化檔案資訊類 FileInfo fi = new FileInfo(strFilePhysicalPath); //獲得檔案大小和建立時間並賦值給標籤 lab_FileDescription.Text = string.Format("檔案大小:{0} 位元組<br><br>上傳時間:{1}<br>", fi.Length, fi.CreationTime); //把檔名賦值給重新命名文字框 tb_FileNewName.Text = strFileName; } private void InitFolderInfo() { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //判斷上傳資料夾是否存在 if (!Directory.Exists(Server.MapPath(strFileUploadPath))) Directory.CreateDirectory(Server.MapPath(strFileUploadPath)); //組合成物理路徑 string strFilePath = Server.MapPath(strFileUploadPath); //從config中讀取資料夾容量限制 double iFolderSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FolderSizeLimit"]); //宣告表示資料夾已用空間的變數並賦初始值 double iFolderCurrentSize = 0; //獲取資料夾中所有檔案 FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles(); //累加檔案大小獲得已用空間值 foreach (FileInfo fi in arrFiles) iFolderCurrentSize += Convert.ToInt32(fi.Length / 1024); //把資料夾容量和已用空間資訊賦值給標籤 lab_FolderInfo.Text = string.Format("資料夾容量限制:{0} M 已用空間:{1:f2} M", iFolderSizeLimit / 1024, iFolderCurrentSize / 1024); } private void InitUploadLimit() { //從config中讀取上傳檔案型別限制並根據逗號分割成字串陣列 string[] arrFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString().Split(','); //從config中讀取上傳檔案大小限制 double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]); //遍歷字串陣列把所有項加入專案編號控制元件 for (int i = 0; i < arrFileTypeLimit.Length; i++) bl_FileTypeLimit.Items.Add(arrFileTypeLimit[i].ToString()); //把檔案大小限制賦值給標籤 lab_FileSizeLimit.Text = string.Format("{0:f2} M", iFileSizeLimit / 1024); } private void InitFileList() { //從config中讀取檔案上傳路徑 string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString(); //組合成物理路徑 string strFilePath = Server.MapPath(strFileUploadPath); //讀取資料夾下所有檔案 FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles(); //把檔名逐一新增到列表框控制元件控制元件 foreach (FileInfo fi in arrFiles) lb_FileList.Items.Add(fi.Name); } private bool IsAllowableFileSize() { //從config中讀取上傳檔案大小限制 double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]) * 1024; //檔案大小是否超出了大小限制? if (iFileSizeLimit > FileUpload.PostedFile.ContentLength) return true; else return false; } private bool IsAllowableFileType() { //從config中讀取上傳檔案型別限制 string strFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString(); //當前副檔名是否能在這個字串中找到? 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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