生成缩略图并加水印的方法
Posted on 2006-05-16 15:54 浪剑 阅读(134) 评论(0) 编辑 收藏 引用 网摘 所属分类: ASP.Net+C#
<!--aspx文件-->
<%@ Page language="c#" Codebehind="WaterPhoto.aspx.cs" AutoEventWireup="false" Inherits="Example.WaterPhoto.WaterPhoto" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WaterPhoto</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" Enctype="multipart/form-data">
<FONT face="宋体"><input type="file" id="UploadFile" runat="Server" NAME="UploadFile"><br>
<asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 392px; POSITION: absolute; TOP: 264px" runat="server"
Text="加水印"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 102; LEFT: 504px; POSITION: absolute; TOP: 272px" runat="server"
Text="生成缩略图"></asp:Button>
<asp:Image id="Image1" style="Z-INDEX: 103; LEFT: 16px; POSITION: absolute; TOP: 88px" runat="server"></asp:Image>
<asp:Image id="Image2" style="Z-INDEX: 104; LEFT: 200px; POSITION: absolute; TOP: 96px" runat="server"></asp:Image>
<asp:TextBox id="TextBox1" style="Z-INDEX: 105; LEFT: 16px; POSITION: absolute; TOP: 48px" runat="server"></asp:TextBox></FONT>
</form>
</body>
</HTML>
<!--aspx.cs类文件-->
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Drawing.Imaging;
using System.IO;
namespace Example.WaterPhoto
{
/**//// <summary>
/// WaterPhoto 的摘要说明。
/// </summary>
public class WaterPhoto : System.Web.UI.Page
{
protected System.Web.UI.HtmlControls.HtmlInputFile UploadFile;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Image Image1;
protected System.Web.UI.WebControls.Image Image2;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.Button Button1;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
}
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void Button1_Click(object sender, System.EventArgs e)
{
//string Path;
if(UploadFile.PostedFile.FileName.Trim()!="")
{
//上传文件
string extension = Path.GetExtension(UploadFile.PostedFile.FileName).ToUpper();
string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();
string path = Server.MapPath(".") + "/UploadFile/" + fileName + extension;
UploadFile.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", 32);
Brush b = new SolidBrush(Color.White);
string addText ="加文字水印";
g.DrawString(addText, f, b, 10, 10);
g.Dispose();
//加图片水印
// System.Drawing.Image image = System.Drawing.Image.FromFile(path);
// System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath(".") + "/Noname1.gif");
// 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(".") + "/UploadFile/" + fileName + "_new" + extension;
image.Save(newPath);
image.Dispose();
if(File.Exists(path))
{
File.Delete(path);
}
Response.Redirect(newPath);
}
}
private void Button2_Click(object sender, System.EventArgs e)
{
if(UploadFile.PostedFile.FileName!=null)
{
string namestr = Path.GetFileName(UploadFile.PostedFile.FileName);//提取文件名
UploadFile.PostedFile.SaveAs(Server.MapPath(".")+@"\"+namestr);
Image2.Visible=true;
Image2.ImageUrl=Server.MapPath(".")+@"\"+namestr;
System.Drawing.Image image,aNewImage;
image=System.Drawing.Image.FromStream(UploadFile.PostedFile.InputStream);
decimal width=image.Width;
decimal height=image.Height;
int newwidth,newheight;
if(width>height)
{
newwidth=150;
newheight=(int)(height/width*150);
}
else
{
newheight=150;
newwidth=(int)(width/height*150);
}
aNewImage=image.GetThumbnailImage(newwidth,newheight,null,IntPtr.Zero);
Bitmap output=new Bitmap(aNewImage);
Graphics g=Graphics.FromImage(output);
g.DrawString(TextBox1.Text.Trim(),new Font("Courier New", 9),new SolidBrush(Color.Red),60,60);//写版权信息及文本格式及位置
output.Save(Server.MapPath(".")+@"\s_"+namestr,System.Drawing.Imaging.ImageFormat.Jpeg);
Image1.Visible=true;
Image1.ImageUrl=Server.MapPath(".")+@"\s_"+namestr;
}
}
}
}
