图片上传功能实现-优快云博客

本文链接：https://blog.youkuaiyun.com/yuwei_shiny/article/details/29415915

前台：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="图片上传._Default" %>

<!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>图片上传</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Image ID="imgPhoto" runat="server" Visible="False" Width="150px" Height="150px"/>
        <asp:FileUpload ID="fuBrowse" runat="server" />
        <asp:Button ID="btnUploding" runat="server" OnClick="btnUploding_Click" Text="上传" /></div>
    </form>
</body>
</html>

后台：

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;

namespace 图片上传
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnUploding_Click(object sender, EventArgs e)
        {
            string fileName = "";
            string fileType = "";
            string serverPath = "";

            if (!fuBrowse.HasFile)
            {
                //没有文件
                ClientMessage("请选择文件！");
            }
            else
            {
                bool temp = false;
                fileName = fuBrowse.FileName;
                //获得图片类型
                fileType = Path.GetExtension(fileName).ToLower();
                string[] types = new string[] { ".png", ".jpg", ".jpge", ".gif" };

                for (int i = 0; i < types.Length; i++)
                {
                    if (fileType == types[i])
                    {
                        temp = true;
                    }
                }
                if (!temp)
                {
                    //文件类型
                    ClientMessage("文件类型不正确！");

                }
                else
                {
                    //设置图片存储路径
                    serverPath = Server.MapPath("Images/");
                    fileName = DisposeFileName(fileName, fileType);
                    CheckFilePath(serverPath, fileName);
                    fuBrowse.SaveAs(serverPath + fileName);
                    if (File.Exists(serverPath + fileName))
                    {
                        ClientMessage("上传成功！");
                        imgPhoto.Visible = true;
                        imgPhoto.ImageUrl = "Images/" + fileName;
                    }

                }
            }
        }

        /// <summary>
        /// 客户端信息
        /// </summary>
        /// <param name="message"></param>
        protected void ClientMessage(string message)
        {
            Page.ClientScript.RegisterStartupScript(GetType(), "message", "<script>alert('" + message + "')</script>");
        }

        /// <summary>
        /// 检验路径
        /// </summary>
        /// <param name="path"></param>
        /// <param name="fileName"></param>
        protected void CheckFilePath(string path, string fileName)
        {
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            if (File.Exists(path + fileName))
            {
                ClientMessage("文件已存在！");
            }
        }

        /// <summary>
        /// 图片重命名
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="fileType"></param>
        /// <returns></returns>
        protected string DisposeFileName(string fileName, string fileType)
        {
            Random rd = new Random();
            DateTime dt = DateTime.Now;
            fileName = dt.ToString("yyyyMMddHHmmss") + rd.Next(100, 999) + fileType;
            return fileName;


        }
    }
}