fileUpLoad上传文件，缩略图，加水印

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;namespace WebApplication1{ public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void btn_sure_Click(object sender, EventArgs e) { string filecontentType = FileUpload1.PostedFile.ContentType; if (filecontentType == "image/bmp" || filecontentType == "image/pjpeg" || filecontentType == "image/gif") { string name = FileUpload1.PostedFile.FileName; FileInfo file = new FileInfo(name); string fileName = file.Name; string fileName_s = "s_" + file.Name; string fileName_sy = "st_" + file.Name; string fileName_syp = "syp_" + file.Name; string webFilePath = Server.MapPath("file/" + fileName); string webFilePath_s = Server.MapPath("file/" + fileName_s); string webFilePath_sy = Server.MapPath("file/" + fileName_sy); string webfilePath_syp = Server.MapPath("file/" + fileName_syp); string webfilePath_sypf = Server.MapPath("file/suiyin.jpg"); if (!File.Exists(webFilePath)) { try { FileUpload1.SaveAs(webFilePath); AddShuiYinWord(webFilePath, webFilePath_sy); AddShuiYinPic(webFilePath, webfilePath_syp, webFilePath_sy); MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); 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，请重新上传~！"; } } 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": break; case "W": toheight = originalImage.Height * width / originalImage.Width; break; case "H": towidth = originalImage.Width * height / originalImage.Height; break; case "Cut": 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.Width - ow) / 2; } break; default: break; } System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.Clear(System.Drawing.Color.Transparent); g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel); try { bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (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 = "我爱李婷婷"; 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">原服务器上图片路径</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(); } }}