/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（相对路径）</param>
/// <param name="thumbnailPath">缩略图路径（相对路径）</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(Utils.GetMapPath(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
{
//保存缩略图
bitmap.Save(Utils.GetMapPath(thumbnailPath));
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// 文件上传方法
/// </summary>
/// <param name="postedFile">文件流</param>
/// <param name="isThumbnail">是否生成缩略图</param>
/// <param name="isWater">是否打水印</param>
/// <returns>上传后文件信息</returns>
public string fileSaveAs(HttpPostedFile postedFile, bool isThumbnail, bool isWater)
{
try
{
string fileExt = Utils.GetFileExt(postedFile.FileName); //文件扩展名，不含“.”
int fileSize = postedFile.ContentLength; //获得文件大小，以字节为单位
string fileName = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf(@"\") + 1); //取得原文件名
string newFileName = Utils.GetRamCode() + "." + fileExt; //随机生成新的文件名
string newThumbnailFileName = newFileName; //随机生成缩略图文件名
string upLoadPath = GetUpLoadPath(); //上传目录相对路径
string fullUpLoadPath = Utils.GetMapPath(upLoadPath); //上传目录的物理路径
string newFilePath = upLoadPath + newFileName; //上传后的路径
string newThumbnailPath = upLoadPath + newThumbnailFileName; //上传后的缩略图路径
//检查文件扩展名是否合法
//if (!CheckFileExt(fileExt))
//{
// return "{\"status\": 0, \"msg\": \"不允许上传" + fileExt + "类型的文件！\"}";
//}
//检查文件大小是否合法
if (!CheckFileSize(fileExt, fileSize))
{
return("{\"status\": 0, \"msg\": \"文件超过限制的大小啦！\"}");
}
//检查上传的物理路径是否存在，不存在则创建
if (!Directory.Exists(fullUpLoadPath))
{
Directory.CreateDirectory(fullUpLoadPath);
}
//保存文件
postedFile.SaveAs(fullUpLoadPath + newThumbnailFileName);
//如果是图片，检查图片是否超出最大尺寸，是则裁剪
//if (IsImage(fileExt) && (this.siteConfig.imgmaxheight > 0 || this.siteConfig.imgmaxwidth > 0))
//{
// Thumbnail.MakeThumbnailImage(fullUpLoadPath + newFileName, fullUpLoadPath + newFileName,
// this.siteConfig.imgmaxwidth, this.siteConfig.imgmaxheight);
//}
////如果是图片，检查是否需要生成缩略图，是则生成
//if (IsImage(fileExt) && isThumbnail && this.siteConfig.thumbnailwidth > 0 && this.siteConfig.thumbnailheight > 0)
//{
// Thumbnail.MakeThumbnailImage(fullUpLoadPath + newFileName, fullUpLoadPath + newThumbnailFileName,
// this.siteConfig.thumbnailwidth, this.siteConfig.thumbnailheight, "Cut");
//}
////如果是图片，检查是否需要打水印
//if (IsWaterMark(fileExt) && isWater)
//{
// switch (this.siteConfig.watermarktype)
// {
// case 1:
// WaterMark.AddImageSignText(newFilePath, newFilePath,
// this.siteConfig.watermarktext, this.siteConfig.watermarkposition,
// this.siteConfig.watermarkimgquality, this.siteConfig.watermarkfont, this.siteConfig.watermarkfontsize);
// break;
// case 2:
// WaterMark.AddImageSignPic(newFilePath, newFilePath,
// this.siteConfig.watermarkpic, this.siteConfig.watermarkposition,
// this.siteConfig.watermarkimgquality, this.siteConfig.watermarktransparency);
// break;
// }
//}
//处理完毕，返回JOSN格式的文件信息
return("{\"status\": 1, \"msg\": \"上传文件成功！\", \"name\": \""
+ fileName + "\", \"path\": \"" + newFilePath + "\", \"thumb\": \""
+ newThumbnailPath + "\", \"size\": " + fileSize + ", \"ext\": \"" + fileExt + "\"}");
}
catch
{
return("{\"status\": 0, \"msg\": \"上传过程中发生意外错误！\"}");
}
}