ASP.NET 图片加水印防盗链实现代码
更新时间：2011年12月22日 22:32:01 作者：
ASP.NET 图片加水印防盗链实现代码，需要的朋友可以参考下。
首先建一个类：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
/// <summary>
///Class1 的摘要说明
/// </summary>
public class Class1:IHttpHandler //调用接口
{
public Class1()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
HttpRequest req = context.Request;
if (req.UrlReferrer != null && req.UrlReferrer.Host.Length > 0) //反盗链代码判断
{
System.Drawing.Image img = System.Drawing.Image.FromFile(context.Request.PhysicalPath);
System.Drawing.Graphics g = Graphics.FromImage(img);
g.DrawString("三国演义", new Font("宋体", 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("您不能盗链本站图片");
}
}
}
在web.config中注册接口：
<httpHandlers>
<add verb="*" path="images/*.jpg" type="Class1,App_Code"/>
</httpHandlers>
url:http://greatverve.cnblogs.com/archive/2011/12/20/asp-net-hotlinking.html
参考：
1.修改web.config
<system.web>
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<!--解决图片防盗链问题-->
<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.添加一个一般执行文件Watermark.ashx，代码如下：
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)
{
//设置客户端缓冲时间过期时间为0，即立即过期
//context.Response.Expires = 0;
//清空服务器端为此会话开启的输出缓存
//context.Response.Clear();
//设置输出文件类型
context.Response.ContentType = "image/jpg";
//将请求文件写入到输出缓存中
#region 获取XML配置信息
DataSet dsConfing = new DataSet();
string watermarkConfigPath = context.Server.MapPath("~/Config/WaterMarkConfig.xml");
if (System.IO.File.Exists(watermarkConfigPath))
dsConfing.ReadXml(watermarkConfigPath);
else
{
//添加默认的水印配置
}
DataRow drConfing = dsConfing.Tables[0].Rows[0];
#endregion
string currentHost = drConfing["allowhost"].ToString();
//判断是否是本地网站引用图片，如果是则返回正确的图片
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 水印代码
string sImgStartPhysicalPath = context.Request.PhysicalPath;
System.Drawing.Image imgStart = System.Drawing.Image.FromFile(sImgStartPhysicalPath);
//备份原图片
//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();
}
//将请求文件写入到输出缓存中
imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imgStart.Dispose();
#endregion
}
else
{
#region 输出原图
//将请求文件写入到输出缓存中
context.Response.WriteFile(context.Request.Url.AbsolutePath);
#endregion
}
}
//如果不是本地引用，则是盗链本站图片
else
{
//将请求文件写入到输出缓存中
context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString());
}
//将输出缓存中的信息传送到客户端
context.Response.End();
}
/// <summary>
/// 图片绘画水印的位置
/// </summary>
/// <param name="positionConfig">位置类型</param>
/// <param name="width">原图片宽</param>
/// <param name="height"></param>
/// <param name="watermarkWidth">水印图宽</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;//水印图片缩放比例
//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>
/// 图片绘画文字位置
/// </summary>
/// <param name="positionConfig">位置类型</param>
/// <param name="width">原图片宽</param>
/// <param name="height"></param>
/// <param name="fontWidth">文字长度</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;//水印图片缩放比例
//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.配置文件的WaterMarkConfig.xml，内容如下：
<?xml version="1.0" encoding="utf-8" ?>
<watermark>
<allowhost>localhost:6219</allowhost><!--允许访问的域名-->
<isflag>true</isflag><!-- true、false-->
<type>font</type><!-- img、font-->
<files>/config|/upfiles/ab</files><!--需要加水印的文件夹-->
<position>bottom-right</position><!-- top-left、top-right、bottom-left、bottom-right-->
<img-path>~/UpFiles/Watermark.png</img-path><!-- 水印位置 -->
<font-style>1</font-style><!--普通文本 0, 加粗文本 1, 倾斜文本 2, 带下划线的文本 4, 中间有直线通过的文本 8-->
<font-size>60</font-size>
<font-color>red</font-color>
<font-content>￥：8000元</font-content>
<errimgpath>images/error.jpg</errimgpath><!-- 盗图片的请求返回的跟目录下的某图片 -->
</watermark>
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
/// <summary>
///Class1 的摘要说明
/// </summary>
public class Class1:IHttpHandler //调用接口
{
public Class1()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
HttpRequest req = context.Request;
if (req.UrlReferrer != null && req.UrlReferrer.Host.Length > 0) //反盗链代码判断
{
System.Drawing.Image img = System.Drawing.Image.FromFile(context.Request.PhysicalPath);
System.Drawing.Graphics g = Graphics.FromImage(img);
g.DrawString("三国演义", new Font("宋体", 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("您不能盗链本站图片");
}
}
}
在web.config中注册接口：
复制代码 代码如下:
<httpHandlers>
<add verb="*" path="images/*.jpg" type="Class1,App_Code"/>
</httpHandlers>
url:http://greatverve.cnblogs.com/archive/2011/12/20/asp-net-hotlinking.html
参考：
1.修改web.config
复制代码 代码如下:
<system.web>
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<!--解决图片防盗链问题-->
<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.添加一个一般执行文件Watermark.ashx，代码如下：
复制代码 代码如下:
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)
{
//设置客户端缓冲时间过期时间为0，即立即过期
//context.Response.Expires = 0;
//清空服务器端为此会话开启的输出缓存
//context.Response.Clear();
//设置输出文件类型
context.Response.ContentType = "image/jpg";
//将请求文件写入到输出缓存中
#region 获取XML配置信息
DataSet dsConfing = new DataSet();
string watermarkConfigPath = context.Server.MapPath("~/Config/WaterMarkConfig.xml");
if (System.IO.File.Exists(watermarkConfigPath))
dsConfing.ReadXml(watermarkConfigPath);
else
{
//添加默认的水印配置
}
DataRow drConfing = dsConfing.Tables[0].Rows[0];
#endregion
string currentHost = drConfing["allowhost"].ToString();
//判断是否是本地网站引用图片，如果是则返回正确的图片
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 水印代码
string sImgStartPhysicalPath = context.Request.PhysicalPath;
System.Drawing.Image imgStart = System.Drawing.Image.FromFile(sImgStartPhysicalPath);
//备份原图片
//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();
}
//将请求文件写入到输出缓存中
imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imgStart.Dispose();
#endregion
}
else
{
#region 输出原图
//将请求文件写入到输出缓存中
context.Response.WriteFile(context.Request.Url.AbsolutePath);
#endregion
}
}
//如果不是本地引用，则是盗链本站图片
else
{
//将请求文件写入到输出缓存中
context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString());
}
//将输出缓存中的信息传送到客户端
context.Response.End();
}
/// <summary>
/// 图片绘画水印的位置
/// </summary>
/// <param name="positionConfig">位置类型</param>
/// <param name="width">原图片宽</param>
/// <param name="height"></param>
/// <param name="watermarkWidth">水印图宽</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;//水印图片缩放比例
//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>
/// 图片绘画文字位置
/// </summary>
/// <param name="positionConfig">位置类型</param>
/// <param name="width">原图片宽</param>
/// <param name="height"></param>
/// <param name="fontWidth">文字长度</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;//水印图片缩放比例
//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.配置文件的WaterMarkConfig.xml，内容如下：
复制代码 代码如下:
<?xml version="1.0" encoding="utf-8" ?>
<watermark>
<allowhost>localhost:6219</allowhost><!--允许访问的域名-->
<isflag>true</isflag><!-- true、false-->
<type>font</type><!-- img、font-->
<files>/config|/upfiles/ab</files><!--需要加水印的文件夹-->
<position>bottom-right</position><!-- top-left、top-right、bottom-left、bottom-right-->
<img-path>~/UpFiles/Watermark.png</img-path><!-- 水印位置 -->
<font-style>1</font-style><!--普通文本 0, 加粗文本 1, 倾斜文本 2, 带下划线的文本 4, 中间有直线通过的文本 8-->
<font-size>60</font-size>
<font-color>red</font-color>
<font-content>￥：8000元</font-content>
<errimgpath>images/error.jpg</errimgpath><!-- 盗图片的请求返回的跟目录下的某图片 -->
</watermark>
相关文章
ASP.NET Core 7 Razor Pages项目发布到IIS的详细过程
这篇文章主要介绍了ASP.NET Core 7 Razor Pages项目发布到IIS的详细过程,详细介绍了发布过程遇到的问题及解决方法，对ASP.NET Core 发布到IIS相关知识感兴趣的朋友一起看看吧2023-01-01
在asp.net中ListView的交替背景颜色实现，GridView的处理得较多，ListView可以这样实现。2010-02-02
在我们的项目开发中，由于ASP.NET的服务器控件功能有限，所以我们经常会自己定义特定的服务器控件，来满足开发中特定的业务要求。可见知道如何开发ASP.NET服务器控件是非常有必要的2015-12-12
这篇文章主要为大家详细介绍了ASP.NET MVC阿里大于短信接口来开发例会短信群发能，具有一定的参考价值，感兴趣的小伙伴们可以参考一下2016-10-10
集合为处理大量数据时所用到一种容器类。简单讲就是数据结构算法的具体平台上的实现。下面这篇文章主要给大家介绍了关于.Net中集合排序的一些你可能不知道的用法，文中通过示例代码介绍的非常详细，需要的朋友可以参考下。2018-04-04
这篇文章主要介绍了.net使用自定义类属性实例,详细讲述了自定义类属性的原理及实现方法,需要的朋友可以参考下2014-10-10
这篇文章主要介绍了ASP.NET MVC5 网站开发中用户登录、注销的实现功能，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下2015-09-09
最近在使用调度程序创建简单的服务,该服务将执行一些重复的IO操作，使用的是Coravel调度库,下面这篇文章主要给大家介绍了关于.Net Core使用Coravel实现任务调度的完整步骤,需要的朋友可以参考下2022-08-08
这篇文章主要介绍了ASP.NET Core中使用默认MVC路由的配置，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧2017-02-02
这篇文章介绍了12小时制和24小时制获取当天零点的问题探讨，有需要的朋友可以参考一下2013-09-09
最新评论