asp.net上传图片并自动生成缩略图和给图片水印

来源：互联网发布：英文进销存软件编辑：程序博客网时间：2024/05/16 10:09

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %> <!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>无标题页</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:FileUpload ID="FileUpload1" runat="server" />         <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />         <asp:Label ID="Label1" runat="server"></asp:Label></div>     </form> </body> </html>     upfile.aspx.cs文件 using System; using System.Data; using System.Configuration; using System.Collections; 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.IO; public partial class upfile_upfile : System.Web.UI.Page {     protected void Page_Load(object sender, EventArgs e)     { }     protected void Button1_Click(object sender, EventArgs e)     {         if (FileUpload1.HasFile)         {             string fileContentType = FileUpload1.PostedFile.ContentType;             if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")             {                 string name = FileUpload1.PostedFile.FileName;                  // 客户端文件路径                 FileInfo file = new FileInfo(name);                 string fileName = file.Name;                                    // 文件名称                 string fileName_s = "s_" + file.Name;                           // 缩略图文件名称                 string fileName_sy = "sy_" + file.Name;                         // 水印图文件名称（文字）                 string fileName_syp = "syp_" + file.Name;                       // 水印图文件名称（图片）                 string webFilePath = Server.MapPath("file/" + fileName);        // 服务器端文件路径                 string webFilePath_s = Server.MapPath("file/" + fileName_s);　　// 服务器端缩略图路径                 string webFilePath_sy = Server.MapPath("file/" + fileName_sy);　// 服务器端带水印图路径(文字)                 string webFilePath_syp = Server.MapPath("file/" + fileName_syp);　// 服务器端带水印图路径(图片)                 string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg");　// 服务器端水印图路径(图片)                 if (!File.Exists(webFilePath))                 {                     try                     {                         FileUpload1.SaveAs(webFilePath);                                                         AddShuiYinWord(webFilePath, webFilePath_sy);                         AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);                         MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut");     // 生成缩略图方法                         Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";                     }                     catch (Exception ex)                     {                         Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;                     }                 }                 else                 {                     Label1.Text = "提示：文件已经存在，请重命名后上传";                 }             }             else             {                 Label1.Text = "提示：文件类型不符";             }         }     }

     /**//// <summary>     /// 生成缩略图     /// </summary>     /// <param name="originalImagePath">源图路径（物理路径）</param>     /// <param name="thumbnailPath">缩略图路径（物理路径）</param>     /// <param name="width">缩略图宽度</param>     /// <param name="height">缩略图高度</param>     /// <param name="mode">生成缩略图的方式</param>        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)     {         System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);         int towidth = width;         int toheight = height;         int x = 0;         int y = 0;         int ow = originalImage.Width;         int oh = originalImage.Height;         switch (mode)         {             case "HW"://指定高宽缩放（可能变形）                                break;             case "W"://指定宽，高按比例                                    toheight = originalImage.Height * width / originalImage.Width;                 break;             case "H"://指定高，宽按比例                 towidth = originalImage.Width * height / originalImage.Height;                 break;             case "Cut"://指定高宽裁减（不变形）                                if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)                 {                     oh = originalImage.Height;                     ow = originalImage.Height * towidth / toheight;                     y = 0;                     x = (originalImage.Width - ow) / 2;                 }                 else                 {                     ow = originalImage.Width;                     oh = originalImage.Width * height / towidth;                     x = 0;                     y = (originalImage.Height - oh) / 2;                 }                 break;             default:                 break;         }         //新建一个bmp图片         System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);         //新建一个画板         System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);         //设置高质量插值法         g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;         //设置高质量,低速度呈现平滑程度         g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;         //清空画布并以透明背景色填充         g.Clear(System.Drawing.Color.Transparent);         //在指定位置并且按指定大小绘制原图片的指定部分         g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),             new System.Drawing.Rectangle(x, y, ow, oh),             System.Drawing.GraphicsUnit.Pixel);         try         {             //以jpg格式保存缩略图             bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);         }         catch (System.Exception e)         {             throw e;         }         finally         {             originalImage.Dispose();             bitmap.Dispose();             g.Dispose();         }     }

    /**//// <summary>     /// 在图片上增加文字水印     /// </summary>     /// <param name="Path">原服务器图片路径</param>     /// <param name="Path_sy">生成的带文字水印的图片路径</param>     protected void AddShuiYinWord(string Path, string Path_sy)     {         string addText = "测试水印";         System.Drawing.Image image = System.Drawing.Image.FromFile(Path);         System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);         g.DrawImage(image, 0, 0, image.Width, image.Height);         System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);         System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);         g.DrawString(addText, f, b, 15, 15);         g.Dispose();         image.Save(Path_sy);         image.Dispose();     }

    /**//// <summary>     /// 在图片上生成图片水印     /// </summary>     /// <param name="Path">原服务器图片路径</param>     /// <param name="Path_syp">生成的带图片水印的图片路径</param>     /// <param name="Path_sypf">水印图片路径</param>     protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)     {         System.Drawing.Image image = System.Drawing.Image.FromFile(Path);         System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);         System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);         g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width,copyImage.Height, System.Drawing.GraphicsUnit.Pixel);         g.Dispose();         image.Save(Path_syp);         image.Dispose();     } }