文件上传后台程序实践与测试（L15/03/04）
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>
