UploadImg 缩略图

最新推荐文章于 2022-08-05 13:52:00 发布

原创最新推荐文章于 2022-08-05 13:52:00 发布 · 1.8k 阅读

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#string #path #服务器 #image #exception #random

本文介绍了一个用于上传图片并生成缩略图的.NET类库方法。该方法能够根据不同的参数生成不同尺寸的缩略图，同时支持添加文字水印。文章详细展示了如何检查文件类型和大小，如何生成唯一的文件名以及如何在服务器上创建必要的目录。

/// <summary> /// UploadImg 的摘要说明 /// </summary> namespace Common { public class BLLFile { public BLLFile() { // // TODO: 在此处添加构造函数逻辑 // } /// <summary> /// 上传图片生成一个缩略图 /// </summary> /// <param name="FileUpload_Img">上传对象</param> /// <param name="strUploadpath">上传虚拟路径(例如："ImgUpload/")</param> /// <param name="intWidth">缩略图宽度</param> /// <param name="intHeight">缩略图高度</param> /// <param name="strMode">生成缩略图的方式(HW:指定高宽缩放；W:指定宽，高按比例；H:指定高，宽按比例；Cut:指定高宽裁减)</param> /// <param name="strAddText">生成水印文字</param> /// <param name="bSmall">是否生成缩略图</param> /// <param name="bWater">是否生成水印</param> public static string ImgUpload1(FileUpload FileUpload_Img, string strUploadpath, int intWidth, int intHeight,string strMode, string strAddText,bool bSmall,bool bWater) { string strMsg = ""; if (FileUpload_Img.HasFile) { //判断文件的大小 int intFileSize = int.Parse(FileUpload_Img.PostedFile.ContentLength.ToString()); if (intFileSize > 200 * 1024) { return "Err；错误提示：图片大小不能超过200K。"; } string fileContentType = FileUpload_Img.PostedFile.ContentType; //JScript.Alert(fileContentType); if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg" || fileContentType == "image/x-png") { string name = FileUpload_Img.PostedFile.FileName; // 客户端文件路径 FileInfo file = new FileInfo(name); string fileName = file.Name; // 文件名称 fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ((new Random()).Next(100000, 999999)).ToString() + fileName.Substring(fileName.LastIndexOf('.')); string fileName_s = "s_" + fileName; // 缩略图文件名称 string fileName_sy = "text_" + fileName; // 水印图文件名称（文字） //string fileName_syp = "water_" + fileName; // 水印图文件名称（图片） //路径 string YearDirectory = DateTime.Now.Year.ToString(); string MothDirectory = DateTime.Now.Month.ToString(); string DayDirectory = DateTime.Now.Day.ToString(); string TempPath = System.Web.HttpContext.Current.Server.MapPath(strUploadpath).ToString() + YearDirectory + "//" + MothDirectory + "//" + DayDirectory + "//"; if (!Directory.Exists(TempPath)) { Directory.CreateDirectory(TempPath); } string webFilePath = TempPath + fileName; // 服务器端文件路径 string webFilePath_s = TempPath + fileName_s;　　// 服务器端缩略图路径 string webFilePath_sy = TempPath + fileName_sy;　// 服务器端带水印图路径(文字) //string webFilePath_syp = Server.MapPath("ImgUpload/" + fileName_syp);　// 服务器端带水印图路径(图片) //string webFilePath_sypf = Server.MapPath("hotelmade.jpg");　// 服务器端水印图路径(图片) if (!File.Exists(webFilePath)) { try { FileUpload_Img.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件 if (bWater) { AddWater(webFilePath, webFilePath_sy, strAddText); } //AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf); if (bSmall) { MakeThumbnail(webFilePath, webFilePath_s, intWidth, intHeight, strMode); // 生成缩略图方法 } strMsg = "Sucess；" + strUploadpath + YearDirectory + "/" + MothDirectory + "/" + DayDirectory + "/" + fileName + "；" + strUploadpath + YearDirectory + "/" + MothDirectory + "/" + DayDirectory + "/" + fileName_s; } catch (Exception ex) { strMsg = "Err；错误提示：文件上传失败，失败原因：" + ex.Message; } } else { strMsg = "Err；错误提示：文件已经存在，请重命名后上传"; } } else { strMsg = "Err；错误提示：文件类型不符"; } } return strMsg; } /// <summary> /// 上传图片生成俩个缩略图 /// </summary> /// <param name="FileUpload_Img">上传对象</param> /// <param name="strUploadpath">上传虚拟路径(例如："ImgUpload/")</param> /// <param name="intWidth1">第一个缩略图宽度</param> /// <param name="intHeight1">第一个缩略图高度</param> /// <param name="intWidth2">第二个缩略图宽度</param> /// <param name="intHeight2">第二个缩略图高度</param> /// <param name="strMode">生成缩略图的方式(HW:指定高宽缩放；W:指定宽，高按比例；H:指定高，宽按比例；Cut:指定高宽裁减)</param> /// <param name="strAddText">生成水印文字</param> /// <param name="bSmall">是否生成缩略图</param> /// <param name="bWater">是否生成水印</param> public static string ImgUpload2(FileUpload FileUpload_Img, string strUploadpath, int intWidth1, int intHeight1, int intWidth2, int intHeight2, string strMode, string strAddText, bool bSmall, bool bWater) { string strMsg = ""; if (FileUpload_Img.HasFile) { //判断文件的大小 int intFileSize = int.Parse(FileUpload_Img.PostedFile.ContentLength.ToString()); if (intFileSize > 200 * 1024) { return "Err；错误提示：图片大小不能超过200K。"; } string fileContentType = FileUpload_Img.PostedFile.ContentType; if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg" || fileContentType == "image/jpeg" || fileContentType == "image/x-png") { string name = FileUpload_Img.PostedFile.FileName; // 客户端文件路径 FileInfo file = new FileInfo(name); string fileName = file.Name; // 文件名称 fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ((new Random()).Next(100000, 999999)).ToString() + fileName.Substring(fileName.LastIndexOf('.')); string fileName_s1 = "s1_" + fileName; // 缩略图文件名称1 string fileName_s2 = "s2_" + fileName; // 缩略图文件名称2 string fileName_sy = "text_" + fileName; // 水印图文件名称（文字） //string fileName_syp = "water_" + fileName; // 水印图文件名称（图片） //路径 string YearDirectory = DateTime.Now.Year.ToString(); string MothDirectory = DateTime.Now.Month.ToString(); string DayDirectory = DateTime.Now.Day.ToString(); string TempPath = System.Web.HttpContext.Current.Server.MapPath(strUploadpath).ToString() + YearDirectory + "//" + MothDirectory + "//" + DayDirectory + "//"; if (!Directory.Exists(TempPath)) { Directory.CreateDirectory(TempPath); } string webFilePath = TempPath + fileName; // 服务器端文件路径 string webFilePath_s1 = TempPath + fileName_s1;　　// 服务器端缩略图路径 string webFilePath_s2 = TempPath + fileName_s2;　　// 服务器端缩略图路径 string webFilePath_sy = TempPath + fileName_sy;　// 服务器端带水印图路径(文字) //string webFilePath_syp = Server.MapPath("ImgUpload/" + fileName_syp);　// 服务器端带水印图路径(图片) //string webFilePath_sypf = Server.MapPath("hotelmade.jpg");　// 服务器端水印图路径(图片) if (!File.Exists(webFilePath)) { try { FileUpload_Img.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件 if (bWater) { AddWater(webFilePath, webFilePath_sy, strAddText); } //AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf); if (bSmall) { MakeThumbnail(webFilePath, webFilePath_s1, intWidth1, intHeight1, strMode); // 生成缩略图方法 MakeThumbnail(webFilePath, webFilePath_s2, intWidth2, intHeight2, strMode); // 生成缩略图方法 } strMsg = "Sucess；" + strUploadpath + YearDirectory + "/" + MothDirectory + "/" + DayDirectory + "/" + fileName + "；" + strUploadpath + YearDirectory + "/" + MothDirectory + "/" + DayDirectory + "/" + fileName_s1 + "；" + strUploadpath + YearDirectory + "/" + MothDirectory + "/" + DayDirectory + "/" + fileName_s2; } catch (Exception ex) { strMsg = "Err；错误提示：文件上传失败，失败原因：" + ex.Message; } } else { strMsg = "Err；错误提示：文件已经存在，请重命名后上传"; } } else { strMsg = "Err；错误提示：文件类型不符"; } } return strMsg; } /// <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> protected 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 if (originalImage.Height > originalImage.Width) { towidth = originalImage.Width * height / originalImage.Height; } else { 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> /// <param name="addText">水印文字</param> protected static void AddWater(string Path, string Path_sy, string addText) { 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", 10); System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.OrangeRed); g.DrawString(addText, f, b, 10, 10); 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(); } } public class OperateFile { public OperateFile() { // // TODO: 在此处添加构造函数逻辑 // } /// <summary> /// 删除文件文件或图片 /// </summary> /// <param name="path">当前文件的路径</param> /// <returns>是否删除成功</returns> public static bool FilePicDelete(string path) { bool ret = false; System.IO.FileInfo file = new System.IO.FileInfo(path); if (file.Exists) { file.Delete(); ret = true; } return ret; } /// <summary> /// 比较2个文件大小，源文件小于目标文件返回false /// </summary> private bool ChkFileSize(string sourcePath, string objectPath) { System.IO.FileInfo sourcefile = new System.IO.FileInfo(sourcePath); System.IO.FileInfo objectfile = new System.IO.FileInfo(objectPath); if (sourcefile.Length < objectfile.Length) { return false; } else return true; } /// <summary> /// 移动文件 /// 支持移动后重新命名 /// </summary> public static void MoveFile(string sourcePath, string objectPath) { //string sourcePath = @"C:/Documents and Settings/Administrator/桌面/flash/专项/操作文件夹/FoundFile/FoundFile/bin/Debug/测试1.log"; //string objectPath = @"C:/Documents and Settings/5.txt";//@"C:/Documents and Settings/测试.log"; try { if (!File.Exists(sourcePath))//源文件 { return; } if (File.Exists(objectPath))//目标文件 { DeleteFile(objectPath); } File.Move(sourcePath, objectPath);//这里的参数是两个文件路径，目标文件名可以不同于源文件名，效果是把源文件移动到新的路径，并且重新命名 } catch { } } /// <summary> /// 删除文件 /// </summary> public static void DeleteFile(string path) { //string path = @"C:/Documents and Settings/Administrator/桌面/flash/专项/操作文件夹/FoundFile/FoundFile/bin/Debug/file/测试1.log"; try { if (!File.Exists(path)) { return; } File.Delete(path); } catch { } } } }