62,074
社区成员
发帖
与我相关
我的任务
分享
if (FileUpload1.HasFile)
{
string filepath = Server.MapPath("~/images/Images/");
HttpFileCollection uploadFiles = Request.Files;
for (int i = 0; i < uploadFiles.Count; i++)
{
System.Drawing.Image image = System.Drawing.Image.FromStream(uploadFiles[i].InputStream);
if (image.Width > 1000)
{
str = OA_Class.Image.SavePicture(uploadFiles[i], "~/images/Images/", 1000, 0);//压缩图片
}
else
{
str = OA_Class.Image.SavePicture(uploadFiles[i], "~/images/Images/", 0, 0);//不压缩
}
arr.Add(str);
}
}
if (FileUpload1.HasFile)
{
string filepath = Server.MapPath("~/images/Images/");
HttpFileCollection uploadFiles = Request.Files;
for (int i = 0; i < uploadFiles.Count; i++)
{
str = OA_Class.Image.SavePicture(uploadFiles[i], "~/images/Images/", 1000, 0);//压缩图片
arr.Add(str);
}
OnePicture = "'" + arr[0] + "'";
}
if (FileUpload1.HasFile)
{
string filepath = Server.MapPath("~/images/Images/");
HttpFileCollection uploadFiles = Request.Files;
for (int i = 0; i < uploadFiles.Count; i++)
{
uploadFiles[i].SaveAs(filepath + uploadFiles[i].FileName);
str = uploadFiles[i].FileName;
arr.Add(str);
}
OnePicture = "'" + arr[0] + "'";
}
public static string SavePicture(HttpPostedFile postedFile, string file, int width, int height)
{
string prefix = System.IO.Path.GetExtension(postedFile.FileName).ToLower();
string fileName = "";
string strFileName = OA_Class.executeNonQuery.NewFileName(postedFile);
fileName = HttpContext.Current.Server.MapPath(file);
try
{
//获取上传图片的大小
Stream PicStream = postedFile.InputStream;
if (width == 0 && height != 0)//指定高 按比例缩放
{
MakeThumbnail(PicStream, fileName + strFileName, width, height, "H", prefix);
}
else if (width != 0 && height == 0)//指定宽 按比例缩放
{
MakeThumbnail(PicStream, fileName + strFileName, width, height, "W", prefix);
}
else if (width == 0 && height == 0)//不缩放
{
postedFile.SaveAs(fileName + strFileName);
}
else//指定宽高裁剪(不会变形)
{
MakeThumbnail(PicStream, fileName + strFileName, width, height, "Cut", prefix);
}
//返回图片名
return strFileName;
}
catch
{
return null;
}
}
MakeThumbnail方法
private static void MakeThumbnail(Stream PicStream, string thumbnailPath, int width, int height, string mode, string PicExtension)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromStream(PicStream);
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 昆明卓联科技(网站、软件开发)
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
{
//根据原来的图片格式,保存为原图片格式
switch (PicExtension.ToLower())
{
case "jpg":
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case "jpeg":
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case "pjpeg":
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case "gif":
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif);
break;
case "bmp":
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp);
break;
case "png":
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png);
break;
default:
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
}
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}