在以前的web应用中，上传文件是个很麻烦的事，现在有了.net，文件上传变得轻而易举。下面的这个例子实现了多文件上传功能。可以动态添加输入表单，上传的文件数量没有限制。代码如下：
multiupload.aspx
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="MultiUpload.aspx.vb" Inherits="aspxWeb.MultiUpload" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>多文件上传</title> <script language="JavaScript"> function addFile() { var str = '<INPUT type="file" size="50" NAME="File">' document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str) } </script> </HEAD> <body> <form id="form1" method="post" runat="server" enctype="multipart/form-data"> <center> <asp:Label Runat="server" ID="MyTitle"></asp:Label> <P id="MyFile"><INPUT type="file" size="50" NAME="File"></P> <P> <input type="button" value="增加(Add)" οnclick="addFile()"> <asp:Button Runat="server" Text="上传" ID="Upload"></asp:Button> <input οnclick="this.form.reset()" type="button" value="重置(ReSet)"> </P> </center> <P align="center"> <asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt" Width="500px" BorderStyle="None" BorderColor="White"></asp:Label> </P> </form> </body></HTML>
后代码：multiupload.aspx.vb
public Class MultiUpload Inherits System.Web.UI.Page Protected WithEvents Upload As System.Web.UI.WebControls.Button Protected WithEvents MyTitle As System.Web.UI.WebControls.Label Protected WithEvents strStatus As System.Web.UI.WebControls.Label
#region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: This method call is required by the Web Form Designer 'Do not modify it using the code editor. InitializeComponent() End Sub
#end Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load MyTitle.Text = "<h3>多文件上传</h3>" Upload.Text = "开始上传" If (Me.IsPostBack) Then Me.SaveImages() End Sub
Private Function SaveImages() As System.Boolean '遍历File表单元素 Dim files As System.Web.HttpFileCollection = System.Web.HttpContext.Current.Request.Files
'状态信息 Dim strMsg As New System.Text.StringBuilder("上传的文件分别是：<hr color=red>") Dim iFile As System.Int32 Try For iFile = 0 To files.Count - 1 '检查文件扩展名字 Dim postedFile As System.Web.HttpPostedFile = files(iFile) Dim fileName, fileExtension As System.String fileName = System.IO.Path.GetFileName(postedFile.FileName) If Not (fileName = String.Empty) Then fileExtension = System.IO.Path.GetExtension(fileName) strMsg.Append("上传的文件类型：" + postedFile.ContentType.ToString() + "<br>") strMsg.Append("客户端文件地址：" + postedFile.FileName + "<br>") strMsg.Append("上传文件的文件名：" + fileName + "<br>") strMsg.Append("上传文件的扩展名：" + fileExtension + "<br><hr>") '可根据扩展名字的不同保存到不同的文件夹 postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName) End If Next strStatus.Text = strMsg.ToString() Return True Catch Ex As System.Exception strStatus.Text = Ex.Message Return False End Try End FunctionEnd Class
c# 版本
upload.aspx
<%@ Page language="c#" Codebehind="UpLoad.aspx.cs" AutoEventWireup="false" Inherits="WebPortal.Upload" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>多文件上传</title> <script language="JavaScript"> function addFile() { var str = '<INPUT type="file" size="50" NAME="File">' document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str) } </script> </HEAD> <body> <form id="form1" method="post" runat="server" enctype="multipart/form-data"> <div align="center"> <h3>多文件上传</h3> <P id="MyFile"><INPUT type="file" size="50" NAME="File"></P> <P> <input type="button" value="增加(Add)" οnclick="addFile()"> <input οnclick="this.form.reset()" type="button" value="重置(ReSet)"> <asp:Button Runat="server" Text="开始上传" ID="UploadButton"></asp:Button> </P> <P> <asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt" Width="500px" BorderStyle="None" BorderColor="White"></asp:Label> </P> </div> </form> </body></HTML>
upload.aspx.cs
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;
namespace WebPortal{ /// <summary> /// UpLoad 的摘要说明。 /// 实现多文件上传 /// </summary> public class Upload : System.Web.UI.Page { protected System.Web.UI.WebControls.Button UploadButton; protected System.Web.UI.WebControls.Label strStatus;
private void Page_Load(object sender, System.EventArgs e) { /// 在此处放置用户代码以初始化页面 if (this.IsPostBack) this.SaveImages(); }
private Boolean SaveImages() { ///'遍历File表单元素 HttpFileCollection files = HttpContext.Current.Request.Files;
/// '状态信息 System.Text.StringBuilder strMsg = new System.Text.StringBuilder(); strMsg.Append("上传的文件分别是：<hr color=red>"); try { for(int iFile = 0; iFile < files.Count; iFile++) { ///'检查文件扩展名字 HttpPostedFile postedFile = files[iFile]; string fileName, fileExtension; fileName = System.IO.Path.GetFileName(postedFile.FileName); if (fileName != "") { fileExtension = System.IO.Path.GetExtension(fileName); strMsg.Append("上传的文件类型：" + postedFile.ContentType.ToString() + "<br>"); strMsg.Append("客户端文件地址：" + postedFile.FileName + "<br>"); strMsg.Append("上传文件的文件名：" + fileName + "<br>"); strMsg.Append("上传文件的扩展名：" + fileExtension + "<br><hr>"); ///'可根据扩展名字的不同保存到不同的文件夹 ///注意：可能要修改你的文件夹的匿名写入权限。 postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName); } } strStatus.Text = strMsg.ToString(); return true; } catch(System.Exception Ex) { strStatus.Text = Ex.Message; return false; } } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); }
/// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.ID = "Upload"; this.Load += new System.EventHandler(this.Page_Load);
} #endregion }}
