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服務器之家 - 編程語言 - ASP.NET教程 - ASP.NET 圖片加水印防盜鏈實現代碼

ASP.NET 圖片加水印防盜鏈實現代碼

2019-09-25 10:35asp.net教程網 ASP.NET教程

ASP.NET 圖片加水印防盜鏈實現代碼,需要的朋友可以參考下。

首先建一個類: 

復制代碼代碼如下:


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 //調用接口 

public Class1() 

// 
//TODO: 在此處添加構造函數邏輯 
// 

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中注冊接口: 

復制代碼代碼如下:


<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 

復制代碼代碼如下:


<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(zhí)行文件Watermark.ashx,代碼如下: 

復制代碼代碼如下:


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) 

//設置客戶端緩沖時間過期時間為0,即立即過期 
//context.Response.Expires = 0; 
//清空服務器端為此會話開啟的輸出緩存 
//context.Response.Clear(); 
//設置輸出文件類型 
context.Response.ContentType = "image/jpg"; 
//將請求文件寫入到輸出緩存中 
#region 獲取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 

//添加默認的水印配置 

DataRow drConfing = dsConfing.Tables[0].Rows[0]; 
#endregion 
string currentHost = drConfing["allowhost"].ToString(); 
//判斷是否是本地網站引用圖片,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 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(); 

//將請求文件寫入到輸出緩存中 
imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg); 
imgStart.Dispose(); 
#endregion 

else 

#region 輸出原圖 
//將請求文件寫入到輸出緩存中 
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 

//將請求文件寫入到輸出緩存中 
context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString()); 

//將輸出緩存中的信息傳送到客戶端 
context.Response.End(); 

/// <summary> 
/// 圖片繪畫水印的位置 
/// </summary> 
/// <param name="positionConfig">位置類型</param> 
/// <param name="width">原圖片寬</param> 
/// <param name="height"></param> 
/// <param name="watermarkWidth">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;//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;//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.配置文件的WaterMarkConfig.xml,內容如下: 

復制代碼代碼如下:


<?xml version="1.0" encoding="utf-8" ?> 
<watermark> 
<allowhost>localhost:6219</allowhost><!--允許訪問的域名--> 
<isflag>true</isflag><!-- true、false--> 
<type>font</type><!-- img、font--> 
<files>/config|/upfiles/ab</files><!--需要加水印的文件夾--> 
<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, 傾斜文本 2, 帶下劃線的文本 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> 

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