水印的代码

加水印的功能代码如下所示

/// <summary>
    /// 图片修改类,主要是用来保护图片版权的，版权归原作者所有
    /// </summary>
    public class picmark
    {
        #region "member fields"
        private string modifyImagePath = null;
        private string drawedImagePath = null;
        private int rightSpace;
        private int bottoamSpace;
        private int lucencyPercent = 70;
        private string outPath = null;
        #endregion
        public picmark()
        {
        }
        #region "propertys"
        /// <summary>
        /// 获取或设置要修改的图像路径
        /// </summary>
        public string ModifyImagePath
        {
            get { return this.modifyImagePath; }
            set { this.modifyImagePath = value; }
        }
        /// <summary>
        /// 获取或设置在画的图片路径(水印图片)
        /// </summary>
        public string DrawedImagePath
        {
            get { return this.drawedImagePath; }
            set { this.drawedImagePath = value; }
        }
        /// <summary>
        /// 获取或设置水印在修改图片中的右边距
        /// </summary>
        public int RightSpace
        {
            get { return this.rightSpace; }
            set { this.rightSpace = value; }
        }
        //获取或设置水印在修改图片中距底部的高度
        public int BottoamSpace
        {
            get { return this.bottoamSpace; }
            set { this.bottoamSpace = value; }
        }
        /// <summary>
        /// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比
        /// </summary>
        public int LucencyPercent
        {
            get { return this.lucencyPercent; }
            set
            {
                if (value >= 0 && value <= 100)
                    this.lucencyPercent = value;
            }
        }
        /// <summary>
        /// 获取或设置要输出图像的路径
        /// </summary>
        public string OutPath
        {
            get { return this.outPath; }
            set { this.outPath = value; }
        }
        #endregion
        #region "methods"
        /// <summary>
        /// 开始绘制水印
        /// </summary>
        public void DrawImage()
        {
            Image modifyImage = null;
            Image drawedImage = null;
            Graphics g = null;
            try
            {
                //建立图形对象
                modifyImage = Image.FromFile(this.ModifyImagePath);
                drawedImage = Image.FromFile(this.DrawedImagePath);
                g = Graphics.FromImage(modifyImage);
                //获取要绘制图形坐标
                int x = modifyImage.Width - this.rightSpace;
                int y = modifyImage.Height - this.BottoamSpace;
                //设置颜色矩阵
                float[][] matrixItems ={
                                           new float[] {1, 0, 0, 0, 0},
                                           new float[] {0, 1, 0, 0, 0},
                                           new float[] {0, 0, 1, 0, 0},
                                           new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},
                                           new float[] {0, 0, 0, 0, 1}};

                ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
                ImageAttributes imgAttr = new ImageAttributes();
                imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
                //绘制阴影图像
                g.DrawImage(
                    drawedImage,
                    new Rectangle(x, y, drawedImage.Width, drawedImage.Height),
                    0, 0, drawedImage.Width, drawedImage.Height,
                    GraphicsUnit.Pixel, imgAttr);
                //保存文件
                string[] allowImageType = { ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" };
                FileInfo file = new FileInfo(this.ModifyImagePath);
                ImageFormat imageType = ImageFormat.Gif;
                switch (file.Extension.ToLower())
                {
                    case ".jpg":
                        imageType = ImageFormat.Jpeg;
                        break;
                    case ".gif":
                        imageType = ImageFormat.Gif;
                        break;
                    case ".png":
                        imageType = ImageFormat.Png;
                        break;
                    case ".bmp":
                        imageType = ImageFormat.Bmp;
                        break;
                    case ".tif":
                        imageType = ImageFormat.Tiff;
                        break;
                    case ".wmf":
                        imageType = ImageFormat.Wmf;
                        break;
                    case ".ico":
                        imageType = ImageFormat.Icon;
                        break;
                    default:
                        break;
                }
                MemoryStream ms = new MemoryStream();
                modifyImage.Save(ms, imageType);
                byte[] imgData = ms.ToArray();
                modifyImage.Dispose();
                drawedImage.Dispose();
                g.Dispose();
                FileStream fs = null;
                if (this.OutPath == null || this.OutPath == "")
                {
                    File.Delete(this.ModifyImagePath);
                    fs = new FileStream(this.ModifyImagePath, FileMode.Create, FileAccess.Write);
                }
                else
                {
                    fs = new FileStream(this.OutPath, FileMode.Create, FileAccess.Write);
                }
                if (fs != null)
                {
                    fs.Write(imgData, 0, imgData.Length);
                    fs.Close();
                }
            }
            finally
            {
                try
                {
                    drawedImage.Dispose();
                    modifyImage.Dispose();
                    g.Dispose();
                }
                catch { ;}
            }
        }
        #endregion
    }

 前台代码如下所示

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="demo.WebForm1" %>

<!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>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
    
    </div>
    </form>
</body>
</html>

 cs类的代码如下所示

 protected void Button1_Click(object sender, EventArgs e)
        {
            string extension = Path.GetExtension(this.FileUpload1.FileName).ToUpper();
            string fileName = Guid.NewGuid().ToString();
            string savePath = Server.MapPath("../upfile/" + fileName+ extension);
            if (!Directory.Exists(Path.GetDirectoryName(savePath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(savePath));
            }
            this.FileUpload1.SaveAs(savePath);

          
            //实例化类 
            picmark wm = new picmark();

            wm.DrawedImagePath = Server.MapPath("/upfile/" + "backlogo.gif")  ;
            wm.ModifyImagePath = savePath;
            wm.RightSpace = 145;
            wm.BottoamSpace =17;
            wm.LucencyPercent = 50;
            wm.OutPath = Server.MapPath("/upfile/" + fileName.Replace("-","").ToUpper() + extension);
            wm.DrawImage();



            //fileName = "_New_" + fileName;
            //string sPath = Server.MapPath("../upfile/" + fileName + extension);
            //this.FileUpload1.SaveAs(sPath);

             //保存加水印过后的图片,删除原始图片 
            if (File.Exists(savePath))
            {
                File.Delete(savePath);
                //File.Delete(wm.OutPath);
            }