ASP.NET 圖片加浮水印防盜鏈實現代碼

首先建一個類： 複製代碼 代碼如下:using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
/// <summary>
///Class1 的摘要說明
/// </summary>
public class Class1:IHttpHandler //調用介面
{
public Class1()
{
//
//TODO: 在此處添加建構函式邏輯
//
}
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
HttpRequest req = context.Request;
if (req.UrlReferrer != null && req.UrlReferrer.Host.Length > 0) //反盜鏈代碼判斷
{
System.Drawing.Image img = System.Drawing.Image.FromFile(context.Request.PhysicalPath);
System.Drawing.Graphics g = Graphics.FromImage(img);
g.DrawString("三國演義", new Font("宋體", 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("您不能盜鏈本站圖片");
}
}
}

在web.config中註冊介面： 複製代碼 代碼如下:<httpHandlers>
<add verb="*" path="images/*.jpg" type="Class1,App_Code"/>
</httpHandlers>

url:http://greatverve.cnblogs.com/archive/2011/12/20/asp-net-hotlinking.html
參考：
1.修改web.config 複製代碼 代碼如下:<system.web>
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<!--解決圖片防盜鏈問題-->
<add verb="*" path="*.jpg" type="MyHttpHandler.Watermark"/>
<add verb="*" path="*.gif" type="MyHttpHandler.Watermark"/>
<add verb="*" path="*.png" type="MyHttpHandler.Watermark"/>
</httpHandlers>
</system.web>

2.添加一個一般執行檔案Watermark.ashx，代碼如下： 複製代碼 代碼如下: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>
/// Summary description for $codebehindclassname$
/// </summary>
[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)
{
//設定用戶端緩衝時間到期時間為0，即立即到期
//context.Response.Expires = 0;
//清空伺服器端為此會話開啟的輸出緩衝
//context.Response.Clear();
//設定輸出檔案類型
context.Response.ContentType = "image/jpg";
//將請求檔案寫入到輸出緩衝中
#region 擷取XML配置資訊
DataSet dsConfing = new DataSet();
string watermarkConfigPath = context.Server.MapPath("~/Config/WaterMarkConfig.xml");
if (System.IO.File.Exists(watermarkConfigPath))
dsConfing.ReadXml(watermarkConfigPath);
else
{
//添加預設的浮水印配置
}
DataRow drConfing = dsConfing.Tables[0].Rows[0];
#endregion
string currentHost = drConfing["allowhost"].ToString();
//判斷是否是以磁碟為基礎的網站引用圖片，如果是則返回正確的圖片
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 浮水印代碼
string sImgStartPhysicalPath = context.Request.PhysicalPath;
System.Drawing.Image imgStart = System.Drawing.Image.FromFile(sImgStartPhysicalPath);
//備份原圖片
//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"))
{
//文字浮水印
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();
}
//將請求檔案寫入到輸出緩衝中
imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imgStart.Dispose();
#endregion
}
else
{
#region 輸出原圖
//將請求檔案寫入到輸出緩衝中
context.Response.WriteFile(context.Request.Url.AbsolutePath);
#endregion
}
}
//如果不是本地引用，則是盜鏈本站圖片
else
{
//將請求檔案寫入到輸出緩衝中
context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString());
}
//將輸出緩衝中的資訊傳送到用戶端
context.Response.End();
}
/// <summary>
/// 圖片繪畫浮水印的位置
/// </summary>
/// <param name="positionConfig">位置類型</param>
/// <param name="width">原圖片寬</param>
/// <param name="height"></param>
/// <param name="watermarkWidth">浮水印圖寬</param>
/// <param name="watermarkHeight"></param>
/// <returns></returns>
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;//浮水印圖片縮放比例
//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);
}
/// <summary>
/// 圖片繪畫文字位置
/// </summary>
/// <param name="positionConfig">位置類型</param>
/// <param name="width">原圖片寬</param>
/// <param name="height"></param>
/// <param name="fontWidth">文字長度</param>
/// <param name="fontHeight"></param>
/// <returns></returns>
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;//浮水印圖片縮放比例
//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.設定檔的WaterMarkConfig.xml，內容如下： 複製代碼 代碼如下:<?xml version="1.0" encoding="utf-8" ?>
<watermark>
<allowhost>localhost:6219</allowhost><!--允許訪問的網域名稱-->
<isflag>true</isflag><!-- true、false-->
<type>font</type><!-- img、font-->
<files>/config|/upfiles/ab</files><!--需要加浮水印的檔案夾-->
<position>bottom-right</position><!-- top-left、top-right、bottom-left、bottom-right-->
<img-path>~/UpFiles/Watermark.png</img-path><!-- 浮水印位置 -->
<font-style>1</font-style><!--普通文本 0, 加粗文本 1, 傾斜文本 2, 帶底線的文本 4, 中間有直線通過的文本 8-->
<font-size>60</font-size>
<font-color>red</font-color>
<font-content>￥：8000元</font-content>
<errimgpath>images/error.jpg</errimgpath><!-- 盜圖片的請求返回的跟目錄下的某圖片 -->
</watermark>