1 原有图片添加水印
1.1 封装一个类,用于获取文件路径
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
namespace _06_图片处理
{
public static class FileHelper
{
public static string GetFilePath()
{
//02 创建文件保存路径
string savePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "Upload\\");
//02-01 根据日期创建文件夹
DateTime dt = DateTime.Now;
savePath += dt.Year + "\\" + dt.Month + "\\" + dt.Day;
if (!Directory.Exists(savePath))
{
//创建文件夹
Directory.CreateDirectory(savePath);
}
//02-02文 件名为当前时间
//savePath += "\\" + dt.ToString().Replace(‘:‘, ‘-‘) + ".gif";
savePath += "\\" + dt.ToString().Replace(‘:‘, ‘-‘) ;
return savePath;
}
}
}
FileHelper
1.2 html页面和ashx页面
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form action="AddLogo.ashx" method="post" enctype="multipart/form-data">
<input type="file" name="OrImg" />
<input type="submit" value="添加水印" />
</form>
</body>
</html>
html
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;
namespace _06_图片处理
{
/// <summary>
/// AddLogo 的摘要说明
/// </summary>
public class AddLogo : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
//01 获取上传图片
HttpPostedFile pf = context.Request.Files["OrImg"];
#region 02 添加水印
//02-01 创建画布
Bitmap bm = new Bitmap(pf.InputStream);
//02-02 创建绘图工具
Graphics gs = Graphics.FromImage(bm);
//02-03 拿到logo图片
Bitmap bmLogo = new Bitmap(AppDomain.CurrentDomain.BaseDirectory + "/images/LogoYK.GIF");
//02-04 开始绘制
gs.DrawImage(bmLogo,bm.Width-bmLogo.Width,bm.Height-bmLogo.Height,bmLogo.Width,bmLogo.Height);
#endregion
#region 03 保存
//03-01 获取文件扩展名
string extName = pf.FileName.Substring(pf.FileName.LastIndexOf(‘.‘));
//03-02 获取文件路径
string ph = FileHelper.GetFilePath();
string savePath = ph + extName;
//03-03 saveAs
bm.Save(savePath);
#endregion
//04 展示
context.Response.Write("<img src=‘" + savePath.Substring(savePath.IndexOf("Upload")) + "‘/> ");
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
AddLogo.ashx
1.3 运行效果
时间： 2024-10-11 14:39:45