最新更新：120821
1.定义路由
2.编写控制器
3.编写图片压缩方法
4.测试运行
---------------------------------------------------
1.定义路由 ，一般写在 Globals.cs 文件中
routes.MapRoute( "ImgRoute", // 图片路由名称 "pics/{thumbnailType}/{width}/{height}/{*imgPath}", // 带有参数的 URL new { controller = "Pictures", action = "ZoomImg", id = UrlParameter.Optional }, // 参数默认值 nameSpace);
2.编写控制器
public class ImagesController : Controller {
/// <summary> /// 缩放图片 /// </summary> /// <param name="thumbnailType">图片缩放方式（取值参考：EB.Sys.Images.ImgThumbnail.ImgThumbnailType 枚举值）</param> /// <param name="width">宽度</param> /// <param name="height">高度</param> /// <param name="imgPath">图片路径</param> /// <returns></returns> public string ZoomImg(string thumbnailType, string width, string height, string imgPath) { //return string.Format("{0} : {1} , {2} , {3} , {4}" // ,DateTime.Now // ,thumbnailType // ,width // ,height // ,imgPath);
string sourceFile = Server.MapPath(string.Format("~/{0}", imgPath));
if (!System.IO.File.Exists(sourceFile)) return string.Format("图片路径无效:{0}", sourceFile);
ImgThumbnail.ImgThumbnailType type = (ImgThumbnail.ImgThumbnailType)thumbnailType.GetInt();
if (type == ImgThumbnail.ImgThumbnailType.Nothing) return string.Format("压缩类型错误:{0}", thumbnailType);
EB.Sys.Images.ImgThumbnail.Thumbnail( sourceFile , Response.OutputStream , width.GetInt() , height.GetInt() , 90 , type); //测试输出流中是否存在内容 //byte[] arr = new byte[1000]; //Response.OutputStream.Write(arr,0,arr.Length); return string.Empty; }
}
3.编写图片压缩方法
这个方法在我另外一篇文章中有介绍，这里做了个加工
http://blog.csdn.net/xxj_jing/article/details/7715729
using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO;
namespace EB.Sys.Images { /// <summary> /// 图片压缩 /// </summary> public class ImgThumbnail { #region 枚举 /// <summary> /// 指定缩放类型 /// </summary> public enum ImgThumbnailType { /// <summary> /// 无 /// </summary> Nothing=0, /// <summary> /// 指定高宽缩放（可能变形） /// </summary> WH = 1, /// <summary> /// 指定宽，高按比例 /// </summary> W = 2, /// <summary> /// 指定高，宽按比例 /// </summary> H = 3, /// <summary> /// 指定高宽裁减（不变形） /// </summary> Cut = 4, /// <summary> /// 按照宽度成比例缩放后，按照指定的高度进行裁剪 /// </summary> W_HCut = 5, } #endregion
#region 图片压缩 /// <summary> /// 无损压缩图片 /// </summary> /// <param name="sourceFile">原图片</param> /// <param name="stream">压缩后保存到流中</param> /// <param name="height">高度</param> /// <param name="width"></param> /// <param name="quality">压缩质量 1-100</param> /// <param name="type">压缩缩放类型</param> /// <returns></returns> private static Bitmap Thumbnail(string sourceFile, int width, int height, int quality , ImgThumbnailType type, out ImageFormat tFormat) { using (System.Drawing.Image iSource = System.Drawing.Image.FromFile(sourceFile)) { tFormat = iSource.RawFormat; //缩放后的宽度和高度 int toWidth = width; int toHeight = height; // int x = 0; int y = 0; int oWidth = iSource.Width; int oHeight = iSource.Height;
switch (type) { case ImgThumbnailType.WH://指定高宽缩放（可能变形） { break; } case ImgThumbnailType.W://指定宽，高按比例 { toHeight = iSource.Height * width / iSource.Width; break; } case ImgThumbnailType.H://指定高，宽按比例 { toWidth = iSource.Width * height / iSource.Height; break; } case ImgThumbnailType.Cut://指定高宽裁减（不变形） { if ((double)iSource.Width / (double)iSource.Height > (double)toWidth / (double)toHeight) { oHeight = iSource.Height; oWidth = iSource.Height * toWidth / toHeight; y = 0; x = (iSource.Width - oWidth) / 2; } else { oWidth = iSource.Width; oHeight = iSource.Width * height / toWidth; x = 0; y = (iSource.Height - oHeight) / 2; } break; } case ImgThumbnailType.W_HCut://按照宽度成比例缩放后，按照指定的高度进行裁剪 { toHeight = iSource.Height * width / iSource.Width; if (height < toHeight) { oHeight = oHeight * height / toHeight; toHeight = toHeight * height / toHeight; } break; } default: break; }
Bitmap ob = new Bitmap(toWidth, toHeight); //ImgWaterMark iwm = new ImgWaterMark(); //iwm.AddWaterMark(ob, towidth, toheight, "www.***.com"); Graphics g = Graphics.FromImage(ob); g.Clear(System.Drawing.Color.WhiteSmoke); g.CompositingQuality = CompositingQuality.HighQuality; g.SmoothingMode = SmoothingMode.HighQuality; g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(iSource , new Rectangle(x, y, toWidth, toHeight) , new Rectangle(0, 0, oWidth, oHeight) , GraphicsUnit.Pixel); g.Dispose();
return ob; } } /// <summary> /// 无损压缩图片 /// </summary> /// <param name="sourceFile">原图片</param> /// <param name="stream">压缩后保存到流中</param> /// <param name="height">高度</param> /// <param name="width"></param> /// <param name="quality">压缩质量 1-100</param> /// <param name="type">压缩缩放类型</param> /// <returns></returns> public static bool Thumbnail(string sourceFile, System.IO.Stream stream, int width,int height, int quality, ImgThumbnailType type) { ImageFormat tFormat = null; Bitmap ob = Thumbnail(sourceFile, width, height, quality, type, out tFormat); //水印 ImgWaterMark.AddWaterMark(ob, "www.***.com"); //以下代码为保存图片时，设置压缩质量 EncoderParameters ep = new EncoderParameters(); long[] qy = new long[1]; qy[0] = quality;//设置压缩的比例1-100 EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy); ep.Param[0] = eParam; try { ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo jpegICIinfo = null; for (int i = 0; i < arrayICI.Length; i++) { if (arrayICI[i].FormatDescription.Equals("JPEG")) { jpegICIinfo = arrayICI[i]; break; } } if (jpegICIinfo != null) { ob.Save(stream, jpegICIinfo, ep);//jpegICIinfo是压缩后的新路径 } else { ob.Save(stream, tFormat); } return true; } catch { return false; } finally { //iSource.Dispose();
ob.Dispose();
} }
/// <summary> /// 无损压缩图片 /// </summary> /// <param name="sourceFile">原图片</param> /// <param name="targetFile">压缩后保存位置</param> /// <param name="height">高度</param> /// <param name="width"></param> /// <param name="quality">压缩质量 1-100</param> /// <param name="type">压缩缩放类型</param> /// <returns></returns> public static bool Thumbnail(string sourceFile, string targetFile, int width, int height, int quality, ImgThumbnailType type) { ImageFormat tFormat = null; Bitmap ob = Thumbnail(sourceFile, width, height, quality, type, out tFormat); //以下代码为保存图片时，设置压缩质量 EncoderParameters ep = new EncoderParameters(); long[] qy = new long[1]; qy[0] = quality;//设置压缩的比例1-100 EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy); ep.Param[0] = eParam; try { ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo jpegICIinfo = null; for (int i = 0; i < arrayICI.Length; i++) { if (arrayICI[i].FormatDescription.Equals("JPEG")) { jpegICIinfo = arrayICI[i]; break; } } if (jpegICIinfo != null) { ob.Save(targetFile, jpegICIinfo, ep);//jpegICIinfo是压缩后的新路径 } else { ob.Save(targetFile, tFormat); } return true; } catch { return false; } finally { //iSource.Dispose();
ob.Dispose();
} } #endregion
} }
4.测试运行
www.****.com/pics/5/195/395/images/ShangZhuang/610505/610505_00--w_498_h_498.jpg
在看一下路由定义：
" pics/{thumbnailType}/{width}/{height}/{*imgPath}"
{thumbnailType} 匹配 5
{width} 匹配 195
{height} 匹配 395
{*imgPath} 匹配 images/ShangZhuang/610505/610505_00--w_498_h_498.jpg
和控制器中的方法：
public string ZoomImg(string thumbnailType, string width, string height, string imgPath)
你明白的！参数列表命名相同！
转载保留：http://write.blog.csdn.net/postedit/7723502
转载于:https://www.cnblogs.com/xxj-jing/archive/2012/07/06/2890058.html
相关资源：压缩图片不失真，c# asp.net