C#图片上传加水印自动生成缩略图源代码
北京联高软件开发有限公司
超强C#图片上传,加水印,自动生成缩略图源代码。可以指定水印位置、文字;可以设置缩略图背景颜色,边框及 其颜色,阴影及其颜色;可以指定缩略图质量;支持GIF,JPEG,JPG,PNG,BMP,TIFF等多种格式图片文件。
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<%@ Import NameSpace="System.Web" %>
<%@ Import NameSpace="Legalsoft.Images" %>
<script language="C#" runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
foreach (string f in Request.Files.AllKeys)
{
// 查找是否存在指定的目,如果允许创建目录,则创建之。
string f_path = TextBox1.Text;
if (!System.IO.Directory.Exists(Server.MapPath(f_path)))
{
if (CheckBox1.Checked)
{
System.IO.Directory.CreateDirectory(Server.MapPath(f_path));
}
else
{
return;
}
}
// 获取提交的文件名,包含的全部的目录信息;需要提取其文件名(名字+后缀)
HttpPostedFile file = Request.Files[f];
string fname = file.FileName.ToLower();
fname = fname.Replace("\\", "/");
int lsub = fname.LastIndexOf("/");
if (lsub >= 0)
{
fname = fname.Substring(lsub + 1, fname.Length - lsub - 1);
string[] fa_ext = fname.Split(".");
string f_pre = fa_ext[fa_ext.Length - 2];
string f_ext = fa_ext[fa_ext.Length - 1];
if (f_ext == "gif" || f_ext == "jpg" || f_ext == "jpeg")
{
file.SaveAs(Server.MapPath(f_path) + "/" + f_pre + "." + f_ext);
XImage img = new XImage();
// 添加水印
if (TextBox2.Text.Trim() != "")
{
img.markPosition = DropDownList5.Items[DropDownList5.SelectedIndex].Text;
img.Mark(f_path + f_pre + "." + f_ext, TextBox2.Text);
}
// 如果需要生成所略图
if (CheckBox2.Checked)
{
int tWidth = Int32.Parse(TextBox3.Text);
int tHeight = Int32.Parse(TextBox4.Text);
img.tBackground = img.ToColor(DropDownList1.Items[DropDownList1.SelectedIndex].Text);
img.tBorder = img.ToColor(DropDownList2.Items[DropDownList2.SelectedIndex].Text);
img.tShadow = img.ToColor(DropDownList3.Items[DropDownList3.SelectedIndex].Text);
img.tQuality = img.ToQuality(DropDownList4.Items[DropDownList4.SelectedIndex].Text);
img.ToThumbnail(f_path + f_pre + "." + f_ext, f_path + f_pre + "_thumb." + f_ext, tWidth, tHeight);
}
}
}
}
}
}
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>C#图片上传及生成缩略图,添加水印的代码</title>
<meta name="keywords" content="C#文件上传的实例代码"/>
<meta name="description" content="在线式代码自动生成器SharpOnline只需要数据库Table定义就自动生成网站的全套C#源代码与页面(包括数据查询于操作、 输入页面、编辑页面及其后台页面)。" />
<meta http-equiv="content-type" content="text/html; charset=gb2312"/>
<meta http-equiv="content-language" content="zh-cn"/>
<link href="/favicon.ico" type="image/x-icon" rel="shortcut icon"/>
<link href="/favicon.ico" type="image/x-icon" rel="bookmark"/>
<meta http-equiv="imagetoolbar" content="no"/>
<meta name="distribution" content="global"/>
<link href="/common/style.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<form id="form1" runat="server">
<center>
<div style="width:938px;background-color:#FFFFFF;">
<table width="938" style="background-color:#F0F0FF;padding:8px;line-height:24px;text-align:left;" cellpadding="0" cellspacing="0">
<tr>
<td align="right">保存的目录:</td>
<td>
<asp:TextBox ID="TextBox1" runat="server">/UploadedFiles/</asp:TextBox>
<asp:CheckBox ID="CheckBox1" runat="server" Checked="true" />自动创建目录
</td>
</tr>
<tr>
<td align="right">添加水印字:</td>
<td>
文字:<asp:TextBox ID="TextBox2" runat="server">50018.COM</asp:TextBox> (可以为空,则不加水印)<br />
位置:
<asp:DropDownList ID="DropDownList5" runat="server">
<asp:ListItem Selected="True">左下角</asp:ListItem>
<asp:ListItem>左上角</asp:ListItem>
<asp:ListItem>右下角</asp:ListItem>
<asp:ListItem>右上角</asp:ListItem>
<asp:ListItem>图片中间</asp:ListItem>
</asp:DropDownList><br />
</td>
</tr>
<tr>
<td align="right">生成缩略图:</td>
<td>
<asp:CheckBox ID="CheckBox2" Checked="true" runat="server" />生成缩略图<br />
宽度: <asp:TextBox ID="TextBox3" runat="server">100</asp:TextBox><br />
高度: <asp:TextBox ID="TextBox4" runat="server">75</asp:TextBox><br />
背景:
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Selected="True">无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
边框:
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem Selected="True">无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
阴影:
<asp:DropDownList ID="DropDownList3" runat="server">
<asp:ListItem Selected="True">无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
质量:
<asp:DropDownList ID="DropDownList4" runat="server">
<asp:ListItem Selected="True">100%</asp:ListItem>
<asp:ListItem>90%</asp:ListItem>
<asp:ListItem>80%</asp:ListItem>
<asp:ListItem>60%</asp:ListItem>
<asp:ListItem>50%</asp:ListItem>
<asp:ListItem>40%</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right">请选择文件:</td>
<td><asp:FileUpload ID="FileUpload1" runat="server" /></td>
</tr>
<tr>
<td align="right"></td>
<td><asp:Button ID="Button2" runat="server" Text="提交" Width="88px" /></td>
</tr>
</table>
</div>
</center>
</form>
</body>
</html>
- using System;
- using System.Data;
- using System.Data.SqlClient;
- using System.Configuration;
- 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.Text;
- using System.Text.RegularExpressions;
- using System.Drawing;
- using System.Drawing.Imaging;
- using System.Collections;
- using System.ComponentModel;
- namespace Legalsoft.Images
- {
- /// <summary>
- /// News 的摘要说明
- /// </summary>
- public class XImage
- {
- public Color tBackground;
- public Color tBorder;
- public Color tShadow;
- public int tQuality;
- public string markPosition;
- /// <summary>
- /// 图片参数预定义
- /// </summary>
- static Hashtable htmimes = new Hashtable();
- internal readonly string AllowExt = ".jpe|.jpeg|.jpg|.png|.tif|.tiff|.bmp|.gif";
- public XImage()
- {
- tBackground = Color.Transparent;
- tBorder = Color.Transparent;
- tShadow = Color.Transparent;
- tQuality = 100;
- markPosition = "左下角";
- #region 图片类型预定义
- htmimes[".jpe"]="image/jpeg";
- htmimes[".jpeg"] = "image/jpeg";
- htmimes[".jpg"] = "image/jpeg";
- htmimes[".png"] = "image/png";
- htmimes[".tif"] = "image/tiff";
- htmimes[".tiff"] = "image/tiff";
- htmimes[".bmp"] = "image/bmp";
- htmimes[".gif"] = "image/gif";
- #endregion
- }
- #region 下载指定URL图片并保存
- /// <summary>
- /// 下载指定URL的文件并保存到指定目录
- /// </summary>
- /// <param name="strUrl"></param>
- public void DownloadImage(string strUrl, string file)
- {
- System.Net.WebClient wc = new System.Net.WebClient();
- wc.DownloadFile(strUrl, file);
- }
- #endregion
- #region C#自动生成缩略图
- /// <summary>
- /// 按给定名字确定颜色
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public Color ToColor(string name)
- {
- if (name == "白 色") return Color.White;
- if (name == "红色") return Color.Red;
- if (name == "蓝色") return Color.Blue;
- if (name == "绿色") return Color.Green;
- if (name == "黑色") return Color.Black;
- if (name == "灰色") return Color.DarkGray;
- if (name == "黄色") return Color.Yellow;
- if (name == "紫色") return Color.Cyan;
- if (name == "无色") return Color.Transparent;
- return Color.Transparent;
- }
- /// <summary>
- /// 按名字设置各种颜色,可以自行扩充:)
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public int ToQuality(string name)
- {
- return Int32.Parse(name.Replace("%", ""));
- }
- /// <summary>
- /// 获取图像编码解码器的所有相关信息
- /// </summary>
- /// <param name="mimeType"& gt;包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
- /// <returns>返回图像 编码解码器的所有相关信息</returns>
- private static ImageCodecInfo GetCodecInfo(string mimeType)
- {
- ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
- foreach (ImageCodecInfo ici in CodecInfo)
- {
- if (ici.MimeType == mimeType) return ici;
- }
- return null;
- }
- /// <summary>
- /// 检测扩展名的有效性
- /// </summary>
- /// <param name="sExt"& gt;文件名扩展名</param>
- /// <returns>如果扩展名 有效,返回true,否则返回false.</returns>
- private bool CheckValidExt(string sExt)
- {
- bool flag = false;
- string[] aExt = AllowExt.Split("|");
- foreach (string filetype in aExt)
- {
- if (filetype.ToLower() == sExt)
- {
- flag = true;
- break;
- }
- }
- return flag;
- }
- /// <summary>
- /// 保存图片
- /// </summary>
- /// <param name="image"& gt;Image 对象</param>
- /// <param name="savePath">保存路径</param>
- /// <param name="ici"& gt;指定格式的编解码参数</param>
- private void SaveImage(System.Drawing.Image image, string savePath, ImageCodecInfo ici)
- {
- //设置 原图片 对象的 EncoderParameters 对象
- EncoderParameters parameters = new EncoderParameters(1);
- parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)tQuality));
- image.Save(savePath, ici, parameters);
- parameters.Dispose();
- }
- /// <summary>
- /// 生成缩略图
- /// </summary>
- /// <param name="sourceImagePath"& gt;原图片路径(相对路径)</param>
- /// <param name="thumbnailImagePath"& gt;生成的缩略图路径,如果为空则保存为原图片路径(相对路径)</param>
- /// <param name="thumbnailImageWidth"& gt;缩略图的宽度(高度与按源图片比例自动生成)</param>
- public void ToThumbnail(string sourceImagePath, string thumbnailImagePath, int thumbnailImageWidth, int thumbnailImageHeight )
- {
- // 1.先检查图片格式等信息
- string ThumbnailImagePath = thumbnailImagePath;
- string SourceImagePath = sourceImagePath;
- string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
- if (SourceImagePath.ToString() == System.String.Empty)
- {
- throw new NullReferenceException("SourceImagePath is null!");
- }
- if (!CheckValidExt(sExt))
- {
- throw new ArgumentException("原图片文件格式不正确,支持的格式有[ " + AllowExt + " ]", "SourceImagePath");
- }
- // 从原图片创建 Image 对象
- System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));
- // 2.计算图片的位置、尺寸等信息
- int tWidth, tHeight, tLeft, tTop;
- double fScale = (double)thumbnailImageHeight / (double)thumbnailImageWidth; // 高度宽度比
- if (((double)image.Width * fScale) > (double)image.Height) // 如果原图比较宽
- {
- tWidth = thumbnailImageWidth;
- tHeight = (int)((double)image.Height * (double)tWidth / (double)image.Width);
- tLeft = 0;
- tTop = (thumbnailImageHeight-tHeight)/2;
- }
- else
- {
- tHeight = thumbnailImageHeight;
- tWidth = (int)((double)image.Width * (double)tHeight / (double)image.Height);
- tLeft = (thumbnailImageWidth-tWidth)/2;
- tTop = 0;
- }
- if (tLeft < 0) tLeft = 0;
- if (tTop < 0) tTop = 0;
- if (tBorder != Color.Transparent)
- {
- tWidth -= 2;
- tHeight -= 2;
- tLeft++;
- tTop++;
- }
- if (tShadow != Color.Transparent)
- {
- tWidth -= 1;
- tHeight -= 1;
- }
- //用指定的大小和格式初始化 Bitmap 类的新实例
- //Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb);
- Bitmap bitmap = new Bitmap(thumbnailImageWidth, thumbnailImageHeight, PixelFormat.Format32bppArgb);
- //从指定的 Image 对象创建 新 Graphics 对象
- Graphics graphics = Graphics.FromImage(bitmap);
- //清除整个绘图面并以透明背景色填充
- if (tBackground != Color.Transparent)
- {
- graphics.Clear(tBackground);
- }
- else
- {
- graphics.Clear(Color.Transparent);
- }
- // 添加阴影
- if (tShadow != Color.Transparent)
- {
- Pen shPen = new Pen(tShadow);
- graphics.DrawLine(shPen, new Point(1, thumbnailImageHeight-1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1));
- graphics.DrawLine(shPen, new Point(thumbnailImageWidth-1, 1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1));
- }
- // 添加边框
- if (tBorder != Color.Transparent)
- {
- Pen bdPen = new Pen(tBorder);
- if (tShadow != Color.Transparent)
- {
- graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-2, thumbnailImageHeight-2));
- }
- else
- {
- graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-1, thumbnailImageHeight-1));
- }
- }
- //在指定位置并且按指定大小绘制 原图 片 对象
- graphics.DrawImage(image, new Rectangle(tLeft, tTop, tWidth, tHeight));
- image.Dispose();
- try
- {
- //将此 原图片 以指定格式并用指定的编解码参数保存到指定文件
- string savepath = (ThumbnailImagePath == null ? SourceImagePath : ThumbnailImagePath);
- SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
- }
- catch (System.Exception e)
- {
- throw e;
- }
- finally
- {
- bitmap.Dispose();
- graphics.Dispose();
- }
- }
- #endregion
- #region C#给图片添加水印
- public void Mark(string sourceImagePath, string markString)
- {
- // 1.先检查图片格式等信息
- string markImagePath = sourceImagePath;
- string SourceImagePath = sourceImagePath;
- string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();
- if (SourceImagePath.ToString() == System.String.Empty)
- {
- throw new NullReferenceException("SourceImagePath is null!");
- }
- if (!CheckValidExt(sExt))
- {
- throw new ArgumentException("原图片文件格式不正确,支持的格式有[ " + AllowExt + " ]", "SourceImagePath");
- }
- // 从原图片创建 Image 对象
- System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));
- //用指定的大小和格式初始 化 Bitmap 类的新实例
- Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);
- //从指定的 Image 对象创建 新 Graphics 对象
- Graphics graphics = Graphics.FromImage(bitmap);
- //在指定位置并且按指定大小绘制 原图片 对 象
- graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height));
- #region 绘制水印
- // 设置水印字体
- int fHeight = image.Height/5;
- if(fHeight>16) fHeight = 16;
- Font drawFont = new Font("Arial", fHeight);
- // 设置水印文字位置,默认为左下角
- float x = 4;
- float y = image.Height - drawFont.Height - 4;
- if (markPosition == "左上角")
- {
- y = 4;
- }
- if (markPosition == "右上角")
- {
- x = image.Width - markString.Length * fHeight / 2 - fHeight;
- y = 4;
- }
- if (markPosition == "右下角")
- {
- x = image.Width - markString.Length * fHeight / 2 - fHeight;
- }
- if (markPosition == "图片中间")
- {
- x = image.Width / 2 - markString.Length * fHeight / 2;
- y = image.Height / 2 - fHeight / 2;
- }
- StringFormat drawFormat = new StringFormat();
- drawFormat.FormatFlags = StringFormatFlags.NoWrap;
- // 设置水印文字颜色,先绘制一个黑色字作为 阴影,再绘制白色字,这样比较显眼;
- SolidBrush drawBrush = new SolidBrush(Color.Black);
- graphics.DrawString(markString, drawFont, drawBrush, x, y, drawFormat);
- drawBrush.Color = Color.White;
- graphics.DrawString(markString, drawFont, drawBrush, x-1, y-1, drawFormat);
- #endregion
- image.Dispose();
- try
- {
- //将此 原图片 以指定格式并用指定的编解码参数保存到指定文件
- string savepath = SourceImagePath;
- SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
- }
- catch (System.Exception e)
- {
- throw e;
- }
- finally
- {
- bitmap.Dispose();
- graphics.Dispose();
- }
- }
- #endregion
- }
- }