ASP.NET画像と透かし防犯チェーン実現コード
12190 ワード
まずクラスを作成します.
Webでconfigにインタフェースを登録するには:
url:http://greatverve.cnblogs.com/archive/2011/12/20/asp-net-hotlinking.html
参照先:
1.webを修正する.config
2.一般的な実行ファイルWatermarkを追加します.ashx、コードは以下の通りです.
3.プロファイルのWaterMarkConfig.xml、内容は以下の通りです.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
///
///Class1
///
public class Class1:IHttpHandler //
{
public Class1()
{
//
//TODO:
//
}
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
HttpRequest req = context.Request;
if (req.UrlReferrer != null && req.UrlReferrer.Host.Length > 0) //
{
System.Drawing.Image img = System.Drawing.Image.FromFile(context.Request.PhysicalPath);
System.Drawing.Graphics g = Graphics.FromImage(img);
g.DrawString(" ", new Font(" ", 20, FontStyle.Bold), Brushes.White, 10, 10);
img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.Flush();
context.Response.End();
}
else
{
context.Response.Write(" ");
}
}
}
Webでconfigにインタフェースを登録するには:
url:http://greatverve.cnblogs.com/archive/2011/12/20/asp-net-hotlinking.html
参照先:
1.webを修正する.config
2.一般的な実行ファイルWatermarkを追加します.ashx、コードは以下の通りです.
using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
namespace MyHttpHandler
{
///
/// Summary description for $codebehindclassname$
///
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Watermark : IHttpHandler
{
public bool IsReusable
{
get
{
return false;
}
}
public void ProcessRequest(HttpContext context)
{
// 0，
//context.Response.Expires = 0;
//
//context.Response.Clear();
//
context.Response.ContentType = "image/jpg";
//
#region XML
DataSet dsConfing = new DataSet();
string watermarkConfigPath = context.Server.MapPath("~/Config/WaterMarkConfig.xml");
if (System.IO.File.Exists(watermarkConfigPath))
dsConfing.ReadXml(watermarkConfigPath);
else
{
//
}
DataRow drConfing = dsConfing.Tables[0].Rows[0];
#endregion
string currentHost = drConfing["allowhost"].ToString();
// ，
if (context.Request.Url.Authority.Equals(currentHost, StringComparison.InvariantCultureIgnoreCase))
{
string localPath = context.Request.Url.LocalPath;
localPath = localPath.Remove(localPath.LastIndexOf('/')).ToLower();// "/images/userphoto"
if (drConfing["isflag"].Equals("true") && drConfing["files"].ToString().ToLower().IndexOf(localPath) > 0)
{
#region
string sImgStartPhysicalPath = context.Request.PhysicalPath;
System.Drawing.Image imgStart = System.Drawing.Image.FromFile(sImgStartPhysicalPath);
//
//int indexOf = sImgStartPhysicalPath.LastIndexOf(".");
//string bakPath = sImgStartPhysicalPath.Remove(indexOf) + "_bak" + sImgStartPhysicalPath.Substring(indexOf);
//imgStart.Save(bakPath);
Graphics gh = System.Drawing.Graphics.FromImage(imgStart);
if (drConfing["type"].Equals("img"))
{
System.Drawing.Image imgWatermark = System.Drawing.Image.FromFile(context.Server.MapPath(drConfing["img-path"].ToString()));
Rectangle rg = SetImgPosition(drConfing["position"].ToString(), imgStart.Width, imgStart.Height, imgWatermark.Width, imgWatermark.Height);
gh.DrawImage(imgWatermark, rg, 0, 0, imgWatermark.Width, imgWatermark.Height, GraphicsUnit.Pixel);
gh.Save();
gh.Dispose();
imgWatermark.Dispose();
}
else if (drConfing["type"].Equals("font"))
{
//
string content = drConfing["font-content"].ToString();
float Size = (float)Convert.ToDouble(drConfing["font-size"].ToString());
FontStyle fontStyle = (FontStyle)int.Parse(drConfing["font-style"].ToString());
System.Drawing.Font f = new System.Drawing.Font("Arial", Size, fontStyle);
Color G_Color = Color.FromName(drConfing["font-color"].ToString());
System.Drawing.Brush b = new System.Drawing.SolidBrush(G_Color);
SizeF sizeF = gh.MeasureString(content, f);
gh.DrawString(content, f, b, SetFontPosition(drConfing["position"].ToString(), imgStart.Width, imgStart.Height, (int)sizeF.Width, (int)sizeF.Height));
gh.Save();
gh.Dispose();
}
//
imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imgStart.Dispose();
#endregion
}
else
{
#region
//
context.Response.WriteFile(context.Request.Url.AbsolutePath);
#endregion
}
}
// ，
else
{
//
context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString());
}
//
context.Response.End();
}
///
///
///
///
///
///
///
///
///
private Rectangle SetImgPosition(string positionConfig,int width,int height,int watermarkWidth,int watermarkHeight)
{
int xpos = 0;
int ypos = 0;
int margin = 10;
int width_margin = width - margin;
int height_margin = height - margin;
double proportion = 1d;//
//int
if ((width_margin > watermarkWidth * proportion) && (height_margin > watermarkHeight * proportion))
{
}
else if ((width_margin > watermarkWidth * proportion) && (height_margin < watermarkHeight * proportion))
{
proportion = Convert.ToDouble( height_margin) / Convert.ToDouble( watermarkHeight);
}
else if ((width_margin < watermarkWidth * proportion) && (height_margin > watermarkHeight * proportion))
{
proportion = Convert.ToDouble(width_margin) / Convert.ToDouble(watermarkWidth);
}
else
{
double proportionW = Convert.ToDouble(width_margin) / Convert.ToDouble(watermarkWidth);
double proportionH = Convert.ToDouble(height_margin) / Convert.ToDouble(watermarkHeight);
proportion = proportionW >= proportionH ? proportionH : proportionW;
}
watermarkWidth = Convert.ToInt32(watermarkWidth * proportion);
watermarkHeight = Convert.ToInt32(watermarkHeight * proportion);
switch (positionConfig)
{
case "top-left":
xpos = margin;
ypos = margin;
break;
case "top-right":
xpos = width_margin - watermarkWidth;
ypos = margin;
break;
case "bottom-left":
xpos = margin;
ypos = height_margin - watermarkHeight;
break;
case "bottom-right":
xpos = width_margin - watermarkWidth ;
ypos = height_margin - watermarkHeight ;
break;
default:
xpos = width_margin - watermarkWidth ;
ypos = height_margin - watermarkHeight;
break;
}
return new Rectangle(xpos,ypos,watermarkWidth,watermarkHeight);
}
///
///
///
///
///
///
///
///
///
private Point SetFontPosition(string positionConfig, int width, int height, int fontWidth, int fontHeight)
{
int xpos = 0;
int ypos = 0;
int margin = 10;
int width_margin = width - margin;
int height_margin = height - margin;
double proportion = 1d;//
//int
if ((width_margin > fontWidth * proportion) && (height_margin > fontHeight * proportion))
{
}
else if ((width_margin > fontWidth * proportion) && (height_margin < fontHeight * proportion))
{
proportion = Convert.ToDouble(height_margin) / Convert.ToDouble(fontHeight);
}
else if ((width_margin < fontWidth * proportion) && (height_margin > fontHeight * proportion))
{
proportion = Convert.ToDouble(width_margin) / Convert.ToDouble(fontWidth);
}
else
{
double proportionH = Convert.ToDouble(height_margin) / Convert.ToDouble(fontHeight);
double proportionW = Convert.ToDouble(width_margin) / Convert.ToDouble(fontWidth);
proportion = proportionW >= proportionH ? proportionH : proportionW;
}
fontWidth = Convert.ToInt32(fontWidth * proportion);
fontHeight = Convert.ToInt32(fontHeight * proportion);
switch (positionConfig)
{
case "top-left":
xpos = margin;
ypos = margin;
break;
case "top-right":
xpos = width_margin - fontWidth;
ypos = margin;
break;
case "bottom-left":
xpos = margin;
ypos = height_margin - fontHeight;
break;
case "bottom-right":
xpos = width_margin - fontWidth;
ypos = height_margin - fontHeight;
break;
default:
xpos = width_margin - fontWidth;
ypos = height_margin - fontHeight;
break;
}
return new Point(xpos, ypos);
}
}
}
3.プロファイルのWaterMarkConfig.xml、内容は以下の通りです.
localhost:6219
true
font
/config|/upfiles/ab
bottom-right
~/UpFiles/Watermark.png
1
60
red
￥：8000
images/error.jpg