自动生成图片缩略图、加水印、远程抓取上传
作者:admin 日期:2008-04-03
下面的方法,.NET1.1和2.0都可以使用
所要用到的命名空间
c# 代码
- using System.IO;
- using System.Net;
- using System.Text.RegularExpressions;
c# 代码
- /**/
- /// <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 AddWater(string Path, string Path_sy)
- {
- string addText = "51aspx.com";
- 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", 60);
- System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
- g.DrawString(addText, f, b, 35, 35);
- 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 AddWaterPic(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();
- }
另一种加图片水印的方法,这个方法比较好,我正在用的!因为他是替换原图片的,方便我们做REPLCE
c# 代码
- /// <summary>
- /// 给图片上水印
- /// </summary>
- /// <param name="filePath">原图片地址</param>
- /// <param name="waterFile">水印图片地址</param>
- public void MarkWater(string filePaths, string waterFile)
- {
- //GIF不水印
- int i = filePaths.LastIndexOf(".");
- string ex = filePaths.Substring(i, filePaths.Length - i);
- if (string.Compare(ex, ".gif", true) == 0)
- {
- return;
- }
- string ModifyImagePath = FilePath + filePaths;//修改的图像路径
- int lucencyPercent = 25;
- Image modifyImage = null;
- Image drawedImage = null;
- Graphics g = null;
- try
- {
- //建立图形对象
- modifyImage = Image.FromFile(ModifyImagePath, true);
- drawedImage = Image.FromFile(FilePath + waterFile, true);
- g = Graphics.FromImage(modifyImage);
- //获取要绘制图形坐标
- int x = modifyImage.Width - drawedImage.Width;
- int y = modifyImage.Height - drawedImage.Height;
- //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)lucencyPercent/1f, 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 fi = new FileInfo(ModifyImagePath);
- ImageFormat imageType = ImageFormat.Gif;
- switch (fi.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;
- File.Delete(ModifyImagePath);
- fs = new FileStream(ModifyImagePath, FileMode.Create, FileAccess.Write);
- if (fs != null)
- {
- fs.Write(imgData, 0, imgData.Length);
- fs.Close();
- }
- }
- finally
- {
- try
- {
- drawedImage.Dispose();
- modifyImage.Dispose();
- g.Dispose();
- }
- catch { ;}
- }
- }
接下来的是远程抓取并上传,我把他和FCK编辑器结合使用,原理是FCK编辑器获取了内容(一般合着远程的图片),然后在经过方法的过滤(图片),然后把图片上传到本地服务器
,然后通过Replace替换FCK获取的内容(当然这里面也可以在多一道工序就是加水印),然后再返回结果,方法结束(存入数据库)!
下面的方法就结合了远程抓取上传并增加水印的效果!
c# 代码
- /*远程保存图片*/
- /// <summary>
- /// 远程数据内容【包含图片】
- /// </summary>
- /// <param name="content"></param>
- /// <returns></returns>
- public string FormatContentPic(string content)
- {
- //自动保存远程图片
- WebClient client = new WebClient();
- //备用Reg:<img.*?src=([\"\'])(http:\/\/.+\.(jpg|gif|bmp|bnp))\1.*?>
- Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase);
- MatchCollection m = reg.Matches(content);
- foreach (Match math in m)
- {
- string imgUrl = math.Groups[1].Value;
- //在原图片名称前加YYMMDD重名名并上传
- Regex regName = new Regex(@"\w+.(?:jpg|gif|bmp|png)", RegexOptions.IgnoreCase);
- string strNewImgName = DateTime.Now.ToString("yyyymmddhhmmss") + regName.Match(imgUrl).ToString();
- if (strNewImgName.LastIndexOf(".") == -1)
- {
- strNewImgName += ".gif";
- }
- try
- {
- //保存图片
- client.DownloadFile(imgUrl,FilePath+"Image/" + strNewImgName);
- MarkWater("Image/" + strNewImgName, "WaterPic.png");
- // AddWaterPic(FilePath + "Image/" + strNewImgName, FilePath + "Image/w_" + strNewImgName, FilePath + "WaterPic.png");
- // AddWater(FilePath + "Image/" + strNewImgName, FilePath + "Image/x_" + strNewImgName);
- content = content.Replace(imgUrl, FilePathName + "Image/" + strNewImgName);
- //content.Replace("\n", "").Replace("\r", "").Replace(imgUrl, FilePathName + "Image/" + strNewImgName);
- }
- catch
- {
- }
- finally
- {
- }
- client.Dispose();
- }
- return content;
- }
- /// <summary>
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