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asp.net,C#,FileUpload控件文件上传简单实例,vs2010

Posted on 2013-02-17 11:32  weekzero  阅读(15683)  评论(0编辑  收藏  举报

文件上传是最常用的B/S项目功能,在FileUpload控件出来之前只能使用html控件的File控件,这样在form中就需要加入【 enctype="multipart/form-data"】。FileUpload出来后就不需要了,form就不需要做上面的更改了。

实例如下,

up1.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up1.aspx.cs" Inherits="up1" %>

<!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>
    <script type="text/javascript">
        function checkform() {
            var strs = document.getElementById("FileUpload1").value;
            if (strs == "") {
                alert("请选择要上传的图片!");
                return false;
            }

            var n1 = strs.lastIndexOf('.') + 1;
            var fileExt = strs.substring(n1, n1 + 3).toLowerCase()
            if (fileExt != "jpg" && fileExt != "bmp" && fileExt != "png") {
                alert('目前系统仅支持jpg、bmp、png后缀图片上传!');
                return false;
            }

        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:FileUpload ID="FileUpload1" runat="server" Width="220px" />
    <asp:Button ID="Button1" runat="server" CssClass="button" OnClick="Button1_Click"
        Text="上传" />
    </form>
</body>
</html>

up1.aspx.cs代码

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 up1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Attributes["onclick"] = "return checkform();";
    }

    protected void Button1_Click(object sender, EventArgs e)
    {

        if (FileUpload1.HasFile)
        {
            string upPath = "/up/";  //上传文件路径
            int upLength = 5;        //上传文件大小
            string upFileType = "|image/bmp|image/x-png|image/pjpeg|image/gif|image/png|image/jpeg|";
            
            string fileContentType = FileUpload1.PostedFile.ContentType;    //文件类型

            if (upFileType.IndexOf(fileContentType.ToLower()) > 0)
            {
                string name = FileUpload1.PostedFile.FileName;                  // 客户端文件路径

                FileInfo file = new FileInfo(name);

                string fileName = DateTime.Now.ToString("yyyyMMddhhmmssfff") + file.Extension; // 文件名称,当前时间(yyyyMMddhhmmssfff)
                string webFilePath = Server.MapPath(upPath) + fileName;        // 服务器端文件路径

                string FilePath = upPath + fileName;   //页面中使用的路径

                if (!File.Exists(webFilePath))
                {
                    if ((FileUpload1.FileBytes.Length / (1024 * 1024)) > upLength)
                    {
                        ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('大小超出 " + upLength + " M的限制,请处理后再上传!');", true);
                        return;
                    }

                    try
                    {
                        FileUpload1.SaveAs(webFilePath);                                // 使用 SaveAs 方法保存文件


                        ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示:文件上传成功');", true);
                    }
                    catch (Exception ex)
                    {
                        ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示:文件上传失败" + ex.Message + "');", true);
                    }
                }
                else
                {
                    ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示:文件已经存在,请重命名后上传');", true);
                }
            }
            else
            {
                ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示:文件类型不符" + fileContentType + "');", true);
            }
        }

    }


}