本篇文章为大家展示了什么是IO帮助类及其实例介绍,代码简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
using System; using System.IO; using System.Web; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; using System.Xml.Serialization; namespace ZMM.Core { /// <summary> /// IO帮助类 /// </summary> public class IOHelper { //是否已经加载了JPEG编码解码器 private static bool _isloadjpegcodec = false; //当前系统安装的JPEG编码解码器 private static ImageCodecInfo _jpegcodec = null; /// <summary> /// 获得文件物理路径 /// </summary> /// <returns></returns> public static string GetMapPath(string path) { if (HttpContext.Current != null) { return HttpContext.Current.Server.MapPath(path); } else { return System.Web.Hosting.HostingEnvironment.MapPath(path); } } #region 序列化 /// <summary> /// XML序列化 /// </summary> /// <param name="obj">序列对象</param> /// <param name="filePath">XML文件路径</param> /// <returns>是否成功</returns> public static bool SerializeToXml(object obj, string filePath) { bool result = false; FileStream fs = null; try { fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite); XmlSerializer serializer = new XmlSerializer(obj.GetType()); serializer.Serialize(fs, obj); result = true; } catch (Exception ex) { throw ex; } finally { if (fs != null) fs.Close(); } return result; } /// <summary> /// XML反序列化 /// </summary> /// <param name="type">目标类型(Type类型)</param> /// <param name="filePath">XML文件路径</param> /// <returns>序列对象</returns> public static object DeserializeFromXML(Type type, string filePath) { FileStream fs = null; try { fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); XmlSerializer serializer = new XmlSerializer(type); return serializer.Deserialize(fs); } catch (Exception ex) { throw ex; } finally { if (fs != null) fs.Close(); } } #endregion #region 水印,缩略图 /// <summary> /// 获得当前系统安装的JPEG编码解码器 /// </summary> /// <returns></returns> public static ImageCodecInfo GetJPEGCodec() { if (_isloadjpegcodec == true) return _jpegcodec; ImageCodecInfo[] codecsList = ImageCodecInfo.GetImageEncoders(); foreach (ImageCodecInfo codec in codecsList) { if (codec.MimeType.IndexOf("jpeg") > -1) { _jpegcodec = codec; break; } } _isloadjpegcodec = true; return _jpegcodec; } /// <summary> /// 生成缩略图 /// </summary> /// <param name="imagePath">图片路径</param> /// <param name="thumbPath">缩略图路径</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 GenerateThumb(string imagePath, string thumbPath, int width, int height, string mode) { Image image = Image.FromFile(imagePath); string extension = imagePath.Substring(imagePath.LastIndexOf(".")).ToLower(); ImageFormat imageFormat = null; switch (extension) { case ".jpg": case ".jpeg": imageFormat = ImageFormat.Jpeg; break; case ".bmp": imageFormat = ImageFormat.Bmp; break; case ".png": imageFormat = ImageFormat.Png; break; case ".gif": imageFormat = ImageFormat.Gif; break; default: imageFormat = ImageFormat.Jpeg; break; } int toWidth = width > 0 ? width : image.Width; int toHeight = height > 0 ? height : image.Height; int x = 0; int y = 0; int ow = image.Width; int oh = image.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 = image.Height * width / image.Width; break; case "H"://指定高,宽按比例 toWidth = image.Width * height / image.Height; break; case "Cut"://指定高宽裁减(不变形) if ((double)image.Width / (double)image.Height > (double)toWidth / (double)toHeight) { oh = image.Height; ow = image.Height * toWidth / toHeight; y = 0; x = (image.Width - ow) / 2; } else { ow = image.Width; oh = image.Width * height / toWidth; x = 0; y = (image.Height - oh) / 2; } break; default: break; } //新建一个bmp Image bitmap = new Bitmap(toWidth, toHeight); //新建一个画板 Graphics g = Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(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(image, new Rectangle(0, 0, toWidth, toHeight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel); try { bitmap.Save(thumbPath, imageFormat); } catch (Exception ex) { throw ex; } finally { if (g != null) g.Dispose(); if (bitmap != null) bitmap.Dispose(); if (image != null) image.Dispose(); } } /// <summary> /// 生成图片水印 /// </summary> /// <param name="originalPath">源图路径</param> /// <param name="watermarkPath">水印图片路径</param> /// <param name="targetPath">保存路径</param> /// <param name="position">位置</param> /// <param name="opacity">透明度</param> /// <param name="quality">质量</param> public static void GenerateImageWatermark(string originalPath, string watermarkPath, string targetPath, int position, int opacity, int quality) { Image originalImage = null; Image watermarkImage = null; //图片属性 ImageAttributes attributes = null; //画板 Graphics g = null; try { originalImage = Image.FromFile(originalPath); watermarkImage = new Bitmap(watermarkPath); if (watermarkImage.Height >= originalImage.Height || watermarkImage.Width >= originalImage.Width) { originalImage.Save(targetPath); return; } if (quality < 0 || quality > 100) quality = 80; //水印透明度 float iii; if (opacity > 0 && opacity <= 10) iii = (float)(opacity / 10.0F); else iii = 0.5F; //水印位置 int x = 0; int y = 0; switch (position) { case 1: x = (int)(originalImage.Width * (float).01); y = (int)(originalImage.Height * (float).01); break; case 2: x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2)); y = (int)(originalImage.Height * (float).01); break; case 3: x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width)); y = (int)(originalImage.Height * (float).01); break; case 4: x = (int)(originalImage.Width * (float).01); y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2)); break; case 5: x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2)); y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2)); break; case 6: x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width)); y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2)); break; case 7: x = (int)(originalImage.Width * (float).01); y = (int)((originalImage.Height * (float).99) - watermarkImage.Height); break; case 8: x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2)); y = (int)((originalImage.Height * (float).99) - watermarkImage.Height); break; case 9: x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width)); y = (int)((originalImage.Height * (float).99) - watermarkImage.Height); break; } //颜色映射表 ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] newColorMap = { colorMap }; //颜色变换矩阵,iii是设置透明度的范围0到1中的单精度类型 float[][] newColorMatrix ={ new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, iii, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; //定义一个 5 x 5 矩阵 ColorMatrix matrix = new ColorMatrix(newColorMatrix); //图片属性 attributes = new ImageAttributes(); attributes.SetRemapTable(newColorMap, ColorAdjustType.Bitmap); attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); //画板 g = Graphics.FromImage(originalImage); //绘制水印 g.DrawImage(watermarkImage, new Rectangle(x, y, watermarkImage.Width, watermarkImage.Height), 0, 0, watermarkImage.Width, watermarkImage.Height, GraphicsUnit.Pixel, attributes); //保存图片 EncoderParameters encoderParams = new EncoderParameters(); encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, new long[] { quality }); if (GetJPEGCodec() != null) originalImage.Save(targetPath, _jpegcodec, encoderParams); else originalImage.Save(targetPath); } catch (Exception ex) { throw ex; } finally { if (g != null) g.Dispose(); if (attributes != null) attributes.Dispose(); if (watermarkImage != null) watermarkImage.Dispose(); if (originalImage != null) originalImage.Dispose(); } } /// <summary> /// 生成文字水印 /// </summary> /// <param name="originalPath">源图路径</param> /// <param name="targetPath">保存路径</param> /// <param name="text">水印文字</param> /// <param name="textSize">文字大小</param> /// <param name="textFont">文字字体</param> /// <param name="position">位置</param> /// <param name="quality">质量</param> public static void GenerateTextWatermark(string originalPath, string targetPath, string text, int textSize, string textFont, int position, int quality) { Image originalImage = null; //画板 Graphics g = null; try { originalImage = Image.FromFile(originalPath); //画板 g = Graphics.FromImage(originalImage); if (quality < 0 || quality > 100) quality = 80; Font font = new Font(textFont, textSize, FontStyle.Regular, GraphicsUnit.Pixel); SizeF sizePair = g.MeasureString(text, font); float x = 0; float y = 0; switch (position) { case 1: x = (float)originalImage.Width * (float).01; y = (float)originalImage.Height * (float).01; break; case 2: x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2); y = (float)originalImage.Height * (float).01; break; case 3: x = ((float)originalImage.Width * (float).99) - sizePair.Width; y = (float)originalImage.Height * (float).01; break; case 4: x = (float)originalImage.Width * (float).01; y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2); break; case 5: x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2); y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2); break; case 6: x = ((float)originalImage.Width * (float).99) - sizePair.Width; y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2); break; case 7: x = (float)originalImage.Width * (float).01; y = ((float)originalImage.Height * (float).99) - sizePair.Height; break; case 8: x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2); y = ((float)originalImage.Height * (float).99) - sizePair.Height; break; case 9: x = ((float)originalImage.Width * (float).99) - sizePair.Width; y = ((float)originalImage.Height * (float).99) - sizePair.Height; break; } g.DrawString(text, font, new SolidBrush(Color.White), x + 1, y + 1); g.DrawString(text, font, new SolidBrush(Color.Black), x, y); //保存图片 EncoderParameters encoderParams = new EncoderParameters(); encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, new long[] { quality }); if (GetJPEGCodec() != null) originalImage.Save(targetPath, _jpegcodec, encoderParams); else originalImage.Save(targetPath); } catch (Exception ex) { throw ex; } finally { if (g != null) g.Dispose(); if (originalImage != null) originalImage.Dispose(); } } #endregion } }
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