直接上代码：
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;public partial class upfile : System.Web.UI.Page
{ protected void Button1_Click(object sender, EventArgs e)
{ string fileContentType = FileUpload1.PostedFile.ContentType; if (fileContentType == "image/gif")
{
upgif();
} else
{
upother();
}
} void upother()
{ if (FileUpload1.HasFile)
{ string fileContentType = FileUpload1.PostedFile.ContentType; if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{ string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
FileInfo file = new FileInfo(name); string fileName = file.Name; // 文件名称
string fileName_s = "s_" + file.Name; // 缩略图文件名称
string fileName_sy = "text_" + file.Name; // 水印图文件名称（文字）
string fileName_syp = "water_" + file.Name; // 水印图文件名称（图片）
string webFilePath = Server.MapPath("upfile/y/" + fileName); // 服务器端文件路径
string webFilePath_s = Server.MapPath("upfile/s/" + fileName_s); // 服务器端缩略图路径
string webFilePath_sy = Server.MapPath("upfile/sy/" + fileName_sy); // 服务器端带水印图路径(文字)
string webFilePath_syp = Server.MapPath("upfile/syp/" + fileName_syp); // 服务器端带水印图路径(图片)
string webFilePath_sypf = Server.MapPath("watermark.gif"); // 服务器端水印图路径(图片)
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件 AddWater(webFilePath, webFilePath_sy);
AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf);
MakeThumbnail(webFilePath, webFilePath_s, 200, 150, "Cut"); // 生成缩略图方法 Image1.ImageUrl = "upfile/y/" + fileName;
Image1.ImageUrl = "upfile/y/" + fileName;
Image2.ImageUrl = "upfile/s/" + fileName_s;
Image3.ImageUrl = "upfile/sy/" + fileName_sy;
Image4.ImageUrl = "upfile/syp/" + fileName_syp;
ImgUrl.Text = Image2.ImageUrl;
} catch (Exception ex)
{
Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
}
} else
{
Label1.Text = "提示：文件类型不符";
}
}
} void upgif()
{ if (FileUpload1.HasFile)
{ string name = FileUpload1.PostedFile.FileName;
FileInfo file = new FileInfo(name); string fileName = file.Name; string webFilePath = Server.MapPath("upfile/y/" + fileName); if (!File.Exists(webFilePath))
{ try
{
FileUpload1.SaveAs(webFilePath);
Image1.ImageUrl = "upfile/y/" + fileName;
ImgUrl.Text = Image2.ImageUrl;
} catch (Exception ex)
{
Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
}
} else
{
Label1.Text = "提示：文件已经存在，请重命名后上传";
}
} else
{
Label1.Text = "提示：文件类型不符";
}
} /**/
///
/// 生成缩略图 ///
/// 源图路径（物理路径）
/// 缩略图路径（物理路径）
/// 缩略图宽度
/// 缩略图高度
/// 生成缩略图的方式
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(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
{ //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
} catch (System.Exception e)
{ throw e;
} finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
} /**/
///
/// 在图片上增加文字水印 ///
/// 原服务器图片路径
/// 生成的带文字水印的图片路径
protected void AddWater(string Path, string Path_sy)
{ string addText = "test.com";
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 60);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
g.DrawString(addText, f, b, 35, 35);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
} /**/
///
/// 在图片上生成图片水印 ///
/// 原服务器图片路径
/// 生成的带图片水印的图片路径
/// 水印图片路径
protected void AddWaterPic(string Path, string Path_syp, string Path_sypf)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();
image.Save(Path_syp);
image.Dispose();
} protected void Page_Load(object sender, EventArgs e)
{
Image1.Attributes.Add("onclick", "rem(this.src)");
Image2.Attributes.Add("onclick", "rem(this.src)");
Image3.Attributes.Add("onclick", "rem(this.src)");
Image4.Attributes.Add("onclick", "rem(this.src)");
}
}
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