1、前台代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Demo09_Upload.aspx.cs" Inherits="Demo0303.Demo09_Upload" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> ???<title></title></head><body> ???<form id="form1" runat="server"> ???<div> ???请选择要上传的文件<asp:FileUpload ID="ful" runat="server" /> ???????<br /> ???????<br/> ???????<asp:Button ID="btnUpload" runat="server" Text="开始上传" OnClick="btnUpload_Click" /> ???????<br/> ???????<br/> ???????<asp:Literal ID="ltaMsg" runat="server"></asp:Literal> ???</div> ???</form></body></html>
2、后台程序
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Demo0303{ ???public partial class Demo09_Upload : System.Web.UI.Page ???{ ???????protected void Page_Load(object sender, EventArgs e) ???????{ ???????} ???????protected void btnUpload_Click(object sender, EventArgs e) ???????{ ???????????//[1]判断文件是否存在 ???????????if (!this.ful.HasFile) return; ???????????//[2]获取文件大小，判断是否符合设置要求（变成MB） ???????????double fileLength = this.ful.FileContent.Length / (1024.0 * 1024.0); ???????????//[3]获取配置文件中上传文件大小的限制 ???????????double limitedLength = Convert.ToDouble(System.Configuration.ConfigurationManager.AppSettings["PhysicsObjectLength"]); ???????????limitedLength = limitedLength / 1024.0;//转换成MB单位 ???????????//判断实际文件大小是否符合要求 ???????????if (fileLength > limitedLength) ???????????{ ???????????????//简单提示 ???????????????//this.ltaMsg.Text = "删除上传文件大小不能超过" + limitedLength + "MB"; ???????????????//---------------------------- ???????????????//用javascript脚本提示(以后常用) ???????????????this.ltaMsg.Text = "<script type=‘text/javascript‘>alert(‘上传文件最大不能超过" +limitedLength + "MB‘ )</script>"; ???????????????return; ???????????} ???????????//[4]获取文件名，判断文件扩展名是否符合要求 ???????????string fileName = this.ful.FileName; ???????????//[5]判断文件名是否是exe文件 ???????????if (fileName.Substring(fileName.LastIndexOf(".")).ToLower() == ".exe") ????????????{ ???????????????this.ltaMsg.Text = "<script type=‘text/javascript‘>alert(‘上传文件不能是exe文件‘)</script>"; ???????????????return; ???????????} ???????????//[6]修改文件名：例上传abc.doc，201805131744+秒+毫秒_文件名 ???????????fileName = DateTime.Now.ToString("yyyyMMddhhssms") + "_" + fileName; ???????????//[7]获取服务器文件夹路径http://www.abcde.com/UploadFiles ???????????string path = Server.MapPath("~/UpLoadFiles"); ???????????//[8]上传文件 ???????????try ???????????{ ???????????????this.ful.SaveAs(path + "/" + fileName); ???????????????this.ltaMsg.Text = "<script type=‘text/javascript‘>alert(‘文件上传成功！‘)</script>"; ???????????} ???????????catch (Exception ex) ???????????{ ???????????????this.ltaMsg.Text = "<script type=‘text/javascript‘>alert(‘文件上传失败！"+ex.Message+"‘)</script>"; ???????????} ???????} ???}}3、web.Config配置
<?xml version="1.0" encoding="utf-8"?><!-- ?有关如何配置 ASP.NET 应用程序的详细信息，请访问 ?http://go.microsoft.com/fwlink/?LinkId=169433 ?--><configuration> ?<appSettings> ???<!--配置上传文件最大字节数：（单位：KB）--> ???<add key="PhysicsObjectLength" value ="30720"/> ?</appSettings> ???<system.web> ?????<!--设置请求的最大字节数（默认是4096，单位：KB）--> ?????<httpRuntime ?maxRequestLength="40960"/> ?????<compilation debug="true" targetFramework="4.0" /> ???</system.web></configuration>
文件上传后台程序实践与测试（L15/03/04）
原文地址：https://www.cnblogs.com/atlj/p/9032857.html