数据库：保存图片的数据格式 图象二进制数据储存字段
前台：
复制代码 代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="UploadWork.aspx.cs" Inherits="meishuguan.UploadWork" %>
<!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>
<style type="text/css">
.style1
{
width: 100%;
}
.style2
{
height: 25px;
}
</style>
</head>
<body>
<script type="text/javascript">
function checkData() {
var fileName = document.getElementById("UploadImage").value;
alert(fileName);
//var fileName = document.getElementsByName("UploadImage").value;
if (fileName == "")
return;
var exName = fileName.substr(fileName.lastIndexOf(".") + 1).toUpperCase();
//alert(exName)
if (exName == "JPG" || exName == "BMP" || exName == "GIF") {
var imgpath = fileName.src;
alert(imgpath);
document.getElementById("PreviewImage").src = imgpath;
document.write(fileName);
}
else {
alert("请选择正确的图片文件")
document.getElementById("PreviewImage").value = ""
}
}
</script>
<form method="post" runat="server">
<div>
<table class="style1">
<tr>
<td class="style2">
<asp:Label ID="MessageLabel" runat="server"></asp:Label>
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style2">
<input id="UploadImage" name = "UploadImage" type="file" runat="server" onchange="checkdata()" />
</td>
<td class="style2">
<img id="PreviewImage" alt="" src="/UploadFiles/2021-04-02/"></tr>
<tr>
<td>
<asp:Button ID="UploadButton" runat="server" Text="确定" OnClick="UploadButton_Click" />
</td>
<td>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
后台：
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;
namespace meishuguan
{
public partial class UploadWork : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UploadButton_Click(object sender, EventArgs e)
{
HttpPostedFile UpFile = UploadImage.PostedFile;
int ImageLength = UpFile.ContentLength;
if (ImageLength == 0)
{
MessageLabel.Text = "请选择要上传的图片";
return;
}
if (ImageLength > Int32.Parse(Application["MaxImageLength"].ToString()))
{
MessageLabel.Text = "图片大小不能大于2M";
return;
}
Stream ImageStream = UpFile.InputStream;
Byte[] ImageByte = new Byte[ImageLength];
ImageStream.Read(ImageByte, 0, ImageLength);
SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
string sqlstring = "insert into [Work](MID,image,length) values(@MID,@image,@length)";
SqlCommand command = new SqlCommand(sqlstring, connection);
command.Parameters.Add("@MID", System.Data.SqlDbType.Int).Value = Session["MID"].ToString();
command.Parameters.Add("@image", System.Data.SqlDbType.Image, ImageLength).Value = ImageByte;
command.Parameters.Add("@length", System.Data.SqlDbType.Int).Value = ImageLength;
connection.Open();
command.ExecuteNonQuery();
connection.Close();
MessageLabel.Text = "图片上传成功";
}
}
}