问天何必
.Net 上传图片加水印
CS:
using System;
using System.Data;
using System.Configuration;
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.Drawing;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Image1.ImageUrl = "aa.gif";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if (File1.PostedFile.FileName.Trim() != "")
{
//上传文件
string extension = Path.GetExtension(File1.PostedFile.FileName).ToLower();
string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
string path = Server.MapPath(".") + "/upload/" + fileName + extension;
File1.PostedFile.SaveAs(path);
//加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
Graphics g = Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
Font f = new Font("Verdana", 16);
Brush b = new SolidBrush(Color.Blue);
string addText = "souwoo";
g.DrawString(addText, f, b, 10, 10);
g.Dispose();
//保存加水印过后的图片,删除原始图片
string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
image.Save(newPath);
image.Dispose();
if (File.Exists(path))
{
File.Delete(path);
}
Image1.ImageUrl = newPath;
// Response.Redirect(newPath);
}
}
protected void Button2_Click(object sender, EventArgs e)
{
//上传文件
string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
string path = Server.MapPath(".") + "/upload/" + fileName + extension;
File1.PostedFile.SaveAs(path);
//加图片水印
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Server.MapPath(".") + "/lz.jpg");
Graphics g = Graphics.FromImage(image);
g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height,
copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
g.Dispose();
//保存加水印过后的图片,删除原始图片
string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
image.Save(newPath);
image.Dispose();
if (File.Exists(path))
{
File.Delete(path);
}
Image1.ImageUrl = newPath;
}
}
aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>MikeCat_WaterMark</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<INPUT id="File1" style="Z-INDEX: 101; LEFT: 144px; WIDTH: 400px; POSITION: absolute; TOP: 88px;
HEIGHT: 22px"
type="file" size="47" name="File1" runat="server">
<asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 176px; POSITION: absolute; TOP: 136px"
runat="server"
Text="上传并加文字水印" OnClick="Button1_Click"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 103; LEFT: 352px; POSITION: absolute; TOP: 136px"
runat="server"
Text="上传并加图片水印" OnClick="Button2_Click"></asp:Button>
<asp:RequiredFieldValidator id="RequiredFieldValidator1" style="Z-INDEX: 104; LEFT: 552px; POSITION:
absolute; TOP: 88px"
runat="server" ErrorMessage="*" ControlToValidate="File1"></asp:RequiredFieldValidator>
<DIV style="Z-INDEX: 105; LEFT: 16px; WIDTH: 100%