【.NET】上传文件，生成缩略图
类名：Upload
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.Util; namespace Tools
{
/// <summary>
/// UploadPic 的摘要说明。
/// </summary>
public class UploadPic
{
#region 构造函数
public UploadPic()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#endregion
#region 上传图片，并生成缩略图
public string upload(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)
{
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];
System.IO.Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream); int oWidth = oImage.Width; //原图宽度
int oHeight = oImage.Height; //原图高度
if(oWidth < tWidth && oHeight < tHeight)
{
result = "smaller";
return result;
}
//按比例计算出缩略图的宽度和高度
if(oWidth >= oHeight)
{
tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
}
else
{
tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
} //生成缩略原图
Bitmap tImage = new Bitmap(tWidth, tHeight);
Graphics g = Graphics.FromImage(tImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
g.Clear(Color.Transparent); //清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径
result = file;
try
{
//以JPG格式保存图片
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
g.Dispose();
tImage.Dispose(); }
return result;
}
public string uploadPNGSIZE(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)
{
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];
System.IO.Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream); int oWidth = oImage.Width; //原图宽度
int oHeight = oImage.Height; //原图高度
if(oWidth < tWidth && oHeight < tHeight)
{
result = "smaller";
return result;
}
//按比例计算出缩略图的宽度和高度
if(oWidth >= oHeight)
{
tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
}
else
{
tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
} //生成缩略原图
Bitmap tImage = new Bitmap(tWidth, tHeight);
Graphics g = Graphics.FromImage(tImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
g.Clear(Color.Transparent); //清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../images/") + file;//保存原图的物理路径
string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../images/") + file; //保存缩略图的物理路径
result = file;
try
{
//以JPG格式保存图片
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);
}
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
g.Dispose();
tImage.Dispose(); }
return result;
} #endregion public string upload_watermark(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];
System.IO.Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
//加水印
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + "watermark.png");
Graphics g_water = Graphics.FromImage(oImage);
g_water.DrawImage(copyImage, new Rectangle(oImage.Width - copyImage.Width, , copyImage.Width, copyImage.Height), , , copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
g_water.Dispose(); int oWidth = oImage.Width; //原图宽度
int oHeight = oImage.Height; //原图高度
if(oWidth < tWidth && oHeight < tHeight)
{
result = "smaller";
return result;
}
//按比例计算出缩略图的宽度和高度
if(oWidth >= oHeight)
{
tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
}
else
{
tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
} //生成缩略原图
Bitmap tImage = new Bitmap(tWidth, tHeight);
Graphics g = Graphics.FromImage(tImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
g.Clear(Color.Transparent); //清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径
result = file;
try
{
//以不同格式保存图片
if(filetype.Trim().ToLower().CompareTo(".png") == )
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
} }
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
g.Dispose();
tImage.Dispose(); }
return result;
}
public string upload_watermark_origin(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
int tWidth = , tHeight = ;
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];
System.IO.Stream oStream = UploadFile.PostedFile.InputStream;
System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
//加水印
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + "watermark.png");
Graphics g_water = Graphics.FromImage(oImage);
g_water.DrawImage(copyImage, new Rectangle(oImage.Width - copyImage.Width, , copyImage.Width, copyImage.Height), , , copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
g_water.Dispose(); int oWidth = oImage.Width; //原图宽度
tWidth = oWidth;
int oHeight = oImage.Height; //原图高度
tHeight = oHeight; if(oWidth < tWidth && oHeight < tHeight)
{
result = "smaller";
return result;
}
//按比例计算出缩略图的宽度和高度
if(oWidth >= oHeight)
{
tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
}
else
{
tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
} //生成缩略原图
Bitmap tImage = new Bitmap(tWidth, tHeight);
Graphics g = Graphics.FromImage(tImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
g.Clear(Color.Transparent); //清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径
result = file;
try
{
//以不同格式保存图片
if(filetype.Trim().ToLower().CompareTo(".png") == )
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
} }
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose();
g.Dispose();
tImage.Dispose(); }
return result;
} #region 上传图片
public string uploadDirect(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") >= )
{
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
System.IO.Stream oStream = UploadFile.PostedFile.InputStream; System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
result = file;
try
{
//以不同格式保存图片
if(filetype.Trim().ToLower().CompareTo(".png") == )
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
catch(Exception ex)
{
//抛出异常
throw ex;
}
finally
{
//释放资源
oImage.Dispose(); }
}
else
{
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
}
return result;
}
public string uploadArticle(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") >= )
{
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
System.IO.Stream oStream = UploadFile.PostedFile.InputStream; System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
result = file;
try
{
//以不同格式保存图片
if(filetype.Trim().ToLower().CompareTo(".png") == )
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose(); }
}
else
{
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("File/") + file;//保存原图的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
}
return result;
} public string uploadDirectWeb(System.Web.UI.WebControls.FileUpload UploadFile)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("pdf") < )
{
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
System.IO.Stream oStream = UploadFile.PostedFile.InputStream; System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
result = file;
try
{
//以不同格式保存图片
if(filetype.Trim().ToLower().CompareTo(".png") == )
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose(); }
}
else
{
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".pdf";
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
}
return result;
}
public string uploadPNG(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
//检查上传文件的格式是否有效
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("pdf") < )
{
if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )
{
result = "上传图片格式无效!";
return result;
} //生成原图
System.IO.Stream oStream = UploadFile.PostedFile.InputStream; System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径
result = file;
try
{
//以JPG格式保存图片
oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);
}
catch(Exception ex)
{
throw ex;
}
finally
{
//释放资源
oImage.Dispose(); }
}
else
{
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".pdf";
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
}
return result;
}
public string uploadFlv(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
string result = "";
//检查上传文件的格式是否有效
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".flv";
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
return result;
}
public string uploadFile(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
return result;
}
public string uploadProjectFile(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, string filename)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
string file = filename + "_" + DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
return result;
} public string uploadAdvertisement(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, string filename)
{
string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);
string result = "";
if(filetype.Trim().CompareTo(".flv") != )
{
result = "wrongformat";
}
else
{
string file = filename + filetype;
string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../flash/") + file;//保存文件的物理路径
result = file;
UploadFile.PostedFile.SaveAs(oFullName);
}
return result;
}
#endregion }
}
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