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 }} 总结 以上是内存溢出为你收集整理的IO帮助类是什么？IO帮助类的实例介绍（附代码）全部内容，希望文章能够帮你解决IO帮助类是什么？IO帮助类的实例介绍（附代码）所遇到的程序开发问题。
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