文件上传后台和前台代码(文件下载也是)-创新互联

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

public partial class upload : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
    {

    }
protected void btupload_Click(object sender, EventArgs e)
    {
if (FileUpload1.HasFile)
        {
string filecontentType = FileUpload1.PostedFile.ContentType;
if (filecontentType == "image/bmp" || filecontentType == "image/gif" || filecontentType == "image/pjpeg" || filecontentType == "image/jpeg")
            {
string name = FileUpload1.PostedFile.FileName;
                FileInfo file= new FileInfo(name);
string filename = file.Name;
string webFilePath = Server.MapPath("image/" + filename);
if (!File.Exists(webFilePath))
                {
try
                    {
                        FileUpload1.SaveAs(webFilePath);
this.lmsg.Text = "提示:文件" + filename + "上传成功!";
this.lpathInfo.Text = "image/" + filename;
this.iPic.ImageUrl = "image/" + filename;
                    }
catch (Exception ex)
                    {
this.lmsg.Text = "提示文件上传失败,失败原因" + ex.Message;

                    }
                }
else
                {
this.lmsg.Text = "该文件已经存在!";
                }
            }
else {
this.lmsg.Text = "提示:文件类型不符";
            }
        }
    }
}
前台代码如下:文件上传后台和前台代码(文件下载
也是) <%@ Page Language="C#" AutoEventWireup="true" CodeFile="upload.aspx.cs" Inherits="upload" %> <!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></title> </head> <body> <form id="form1" runat="server"> <div> <table> <tr> <td><asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="btupload" runat="server" onclick="btupload_Click" Text="上传" /> <asp:Image ID="iPic" ImageUrl="" Height="100px" runat="server" /> </td> </tr> <tr><td> <asp:Label ID="lmsg" runat="server" Text="Label"></asp:Label>      <asp:Label ID="lpathInfo" runat="server" Text="Label"></asp:Label> </td></tr> </table> </div> </form> </body> </html>

 文件下载代码

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