/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="fileName">源图路径（绝对路径）</param>
/// <param name="newFileName">缩略图路径（绝对路径）</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 MakeThumbnailImage(string fileName, string newFileName, int width, int height, string mode) // 此方法需要重构 UNDO
{
//Image originalImage = Image.FromFile(fileName);
byte[] imageBytes = SFTPFactory.CreateSFTPHelper().RecieveStream(fileName);
Image originalImage = Image.FromStream(new System.IO.MemoryStream(imageBytes));
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
Bitmap b = new Bitmap(towidth, toheight);
try
{
//新建一个画板
Graphics g = Graphics.FromImage(b);
//设置高质量插值法
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = SmoothingMode.AntiAlias;
g.PixelOffsetMode = PixelOffsetMode.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(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);
// 将图片转换为流
Stream ms = new MemoryStream();
b.Save(ms, ImageFormat.Jpeg);
string workingDirectory = newFileName.Substring(0, newFileName.LastIndexOf("/") + 1);
string path = AppDomain.CurrentDomain.BaseDirectory + "uploads/";
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
string imgPath = path + newFileName.Substring(newFileName.LastIndexOf("/"));
b.Save(imgPath);
SFTPFactory factory = new SFTPFactory();
factory.InitFSTPClient(workingDirectory);
SFTPFactory.CreateSFTPHelper().Save(ms, newFileName);
//SaveImage(b, newFileName, GetCodecInfo("image/" + GetFormat(newFileName).ToString().ToLower()));
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
b.Dispose();
}
}
/// <summary>
/// 制作缩略图
/// </summary>
/// <param name="original">图片对象</param>
/// <param name="newFileName">新图路径</param>
/// <param name="maxWidth">最大宽度</param>
/// <param name="maxHeight">最大高度</param>
public static void MakeThumbnailImage(Image original, string newFileName, int maxWidth, int maxHeight)
{
Size _newSize = ResizeImage(original.Width, original.Height, maxWidth, maxHeight);
string path = HttpContext.Current.Server.MapPath("/uploadsTest/");
if (!File.Exists(path))
{
Directory.CreateDirectory(path);
}
//original.Save(Path.Combine(path,new Random(1000).Next()+".jpg"));
// UNDO:
using (Image displayImage = new Bitmap(original, _newSize))
{
try
{
SFTPFactory facotry = new SFTPFactory();
string directory = newFileName.Substring(0, newFileName.LastIndexOf(@"/"));
facotry.InitFSTPClient(directory);
// 将图片装换成流
byte[] imageBytes = SFTPFactory.CreateSFTPHelper().RecieveStream(newFileName);
Stream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
displayImage.Save(ms, original.RawFormat);
displayImage.Save(Path.Combine(path, new Random().Next() + ".Png"));
//SFTPFactory.SFTPHelper.client.Delete(newFileName);
SFTPFactory.CreateSFTPHelper().Save(ms, newFileName);
}
finally
{
original.Dispose();
}
}
}
/// <summary>
/// 按模版比例最大范围的裁剪图片并缩放至模版尺寸 2015年12月14日 【MF】
/// </summary>
/// <param name="postedFile">上传的图片流</param>
/// <param name="filePath">文件保存路径</param>
/// <param name="maxWidth">最大宽（单位：px）</param>
/// <param name="maxHeight">最大高（单位：px）</param>
public static string MakeThumbnailImage(System.Web.HttpPostedFile postedFile, string fileSaveUrl, int maxWidth, int maxHeight)
{
// 1.0 从文件获取原始图片， 并使用流中嵌入的颜色管理信息
Image originalImage = Image.FromStream(postedFile.InputStream, true);
string imgExt = Common.GetFileExt(postedFile.FileName);
string fileName = DateTime.Now.ToString("yyyyMMddHHmmssffff") + "." + imgExt; ;
double destWidth, destHeight;
try
{
// 1.1 初始化 SFTP 协议内容
SFTPFactory factory = new SFTPFactory();
factory.InitFSTPClient(fileSaveUrl);
SFTPHelper sftpHelper = SFTPFactory.CreateSFTPHelper();
double templateRate = (double)maxWidth / (double)maxHeight; // 模板的宽高比例
double originalRate = (double)originalImage.Width / (double)originalImage.Height; // 原始图片宽高比
// 2.0 原图宽高均小于模板，不作处理，直接保存
if (originalImage.Width <= maxWidth && originalImage.Height <= maxHeight)
{
destWidth = originalImage.Width;
destHeight = originalImage.Height;
}
if (originalRate > templateRate)
{
double zoom = (double)maxWidth / (double)originalImage.Width;
destHeight = originalImage.Height * zoom;
destWidth = maxWidth;
}
else
{
double zoom = (double)maxHeight / (double)originalImage.Height;
destWidth = originalImage.Width * zoom;
destHeight = maxHeight;
}
Image img = new Bitmap(maxWidth, maxHeight);
Graphics graphics = Graphics.FromImage(img);
graphics.InterpolationMode = InterpolationMode.High;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
graphics.Clear(Color.White);
graphics.DrawImage(originalImage, new Rectangle(0, 0, (int)destWidth, (int)destHeight), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
MemoryStream ms = new MemoryStream();
byte[] myImage = null;
img.Save(ms, ImageFormat.Jpeg);
myImage = ms.GetBuffer();
MemoryStream newMs = new MemoryStream(myImage, 0, myImage.Length, true, true);
sftpHelper.Save(newMs, fileSaveUrl + fileName);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return fileName;
}
/// <summary>
/// 文件上传方法C
/// </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>
/// <param name="isReOriginal">是否返回文件原名称</param>
/// <returns>服务器文件路径</returns>
public string FileSaveAs(HttpPostedFile postedFile, bool isThumbnail, bool isWater, bool _isImage, bool _isReOriginal)
{
try
{
string fileExt = Common.GetFileExt(postedFile.FileName); //文件扩展名，不含“.”
string originalFileName = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf(@"\") + 1); //取得文件原名
string fileName = Common.GetRamCode() + "." + fileExt; //随机文件名
string dirPath = GetUpLoadPath(); //上传目录相对路径
//检查文件扩展名是否合法
if (!CheckFileExt(fileExt))
{
return "不允许上传" + fileExt + "类型的文件！";
}
//检查是否必须上传图片
if (_isImage && !IsImage(fileExt))
{
return "对不起，仅允许上传图片文件！";
}
//检查文件大小是否合法
if (!CheckFileSize(fileExt, postedFile.ContentLength))
{
return "文件超过限制的大小啦！";
}
// 获取图片服务器的地址
var picPath = "http://pic.myqwe.com/" + this.siteConfig.attachpath + "/" + fileName;
// string workingDirectory = "/data/web/userpic/Uploads/" + userId + "LogoAndBanner" + "/";
string workingDirectory = GetUpLoadPath();
SFTPFactory factory = new SFTPFactory();
factory.InitFSTPClient(workingDirectory);
//获得要保存的文件路径
string serverFileName = Path.Combine(workingDirectory, fileName);
string serverThumbnailFileName = Path.Combine(workingDirectory, "thumb/" + fileName); //workingDirectory + "small_" + fileName;
string returnFileName = serverFileName;
//Stream stream = new MemoryStream();
//postedFile.InputStream.CopyTo(stream,postedFile.ContentLength);
//var temp = postedFile.InputStream;
//保存文件 postedFile.SaveAs(toFileFullPath + fileName);
SFTPFactory.CreateSFTPHelper().Save(postedFile.InputStream, serverFileName);
//Image img = Image.FromStream(new System.IO.MemoryStream(postedFile.InputStream));
//如果是图片，检查图片尺寸是否超出限制 UNDO
if (IsImage(fileExt) && (this.siteConfig.attachimgmaxheight > 0 || this.siteConfig.attachimgmaxwidth > 0))
{
//Thumbnail.MakeThumbnailImage(serverFileName, serverFileName, this.siteConfig.attachimgmaxwidth, this.siteConfig.attachimgmaxheight);
}
//是否生成缩略图
if (IsImage(fileExt) && isThumbnail && this.siteConfig.thumbnailwidth > 0 && this.siteConfig.thumbnailheight > 0)
{
Thumbnail.MakeThumbnailImage(serverFileName, serverThumbnailFileName, this.siteConfig.thumbnailwidth, this.siteConfig.thumbnailheight, "Cut");
returnFileName += "," + serverThumbnailFileName; //返回缩略图，以逗号分隔开
}
//是否打图片水印
if (IsWaterMark(fileExt) && isWater)
{
switch (this.siteConfig.watermarktype)
{
case 1:
WaterMark.AddImageSignText(serverFileName, serverFileName,
this.siteConfig.watermarktext, this.siteConfig.watermarkposition,
this.siteConfig.watermarkimgquality, this.siteConfig.watermarkfont, this.siteConfig.watermarkfontsize);
break;
case 2:
WaterMark.AddImageSignPic(serverFileName, serverFileName,
this.siteConfig.watermarkpic, this.siteConfig.watermarkposition,
this.siteConfig.watermarkimgquality, this.siteConfig.watermarktransparency);
break;
}
}
//如果需要返回原文件名
if (_isReOriginal)
{
return serverFileName + "-------------" + originalFileName;
}
return picPath;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
