C#-C# 如何对图片加水印、防盗链接图片

Question

如题，为了防止图片被采集采集，C#如何对图片加上水印和防盗链呢！

Answer 1

如题 。我觉得看需求 如果你是想上传图片的时候进行处理可以再传图片的时候处理 第二种就是楼上的 只是访问的时候打上水印，不对原图进行操作

Answer 2

按照下面流程解决图片防盗链：

1.修改web.congif

?<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>