FileUpload控件使用例子

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upload.aspx.cs" Inherits="up" %>

<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" /> 
        <input id="Button1" runat="server" onserverclick="Button1_ServerClick" type="button"
            value="上传" /></div>
    </form>
</body>
</html>


//Code:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 up : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_ServerClick(object sender, EventArgs e)
    {
        //取得字符串：“C:/Documents and Settings/Administrator/Desktop/picture/213.jpg”
        string fileName = this.FileUpload1.PostedFile.FileName;
        //取得从开始到最后一个“/”得长度：fileName.LastIndexOf("//")
        int length = fileName.Length - fileName.LastIndexOf("//") - 1;
        //截取从fileName.LastIndexOf("//") + 1位置到length位置的字符串
        fileName = fileName.Substring(fileName.LastIndexOf("//") + 1, length);
        //取得字符串：“C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/WebSites/WebSite1/upload2/”
        string path = Server.MapPath("upload2//");
        //判断有没有path的文件，如果没有则创建一个新的
        if (!Directory.Exists(path))
        {   
            Directory.CreateDirectory(path);
        }
        //取得文件的后缀名：“.jpg ”
        string s1 = System.IO.Path.GetExtension(fileName);
        //取得Web.Config中 <appSettings><add key="conn" value="2048"/></appSettings>配置的值
        string s2=System.Configuration.ConfigurationManager.AppSettings["conn"];
        //取得上传的文件的大小，单位为bytes
        int filesize = (FileUpload1.PostedFile.ContentLength) / 1024;
        if (s1 == ".jpg" || s1 == ".gif")
        {
            //如果文件大小<设定大小，则上传文件到：C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/WebSites/WebSite1/upload2/213.jpg
            if (filesize < Convert.ToInt32(s2))
            {
                FileUpload1.PostedFile.SaveAs(path + fileName);    
            }
            else
            {
                Response.Write("<mce:script type="text/javascript"><!--
alert('太大了')
// --></mce:script>");
            }
        }
        else
        {
            Response.Write("<mce:script type="text/javascript"><!--
alert('请选择JPG或GIF格式的文件')
// --></mce:script>");
        }
    }
}
posted on 2011-05-25 09:34 babyblue 阅读(115) 评论(0) 收藏举报
FileUpload控件 使用例子

FileUpload控件使用例子
