网站防盗链就是那么简单

第一步 : 实现 IHttpHandler 接口

    

 
  namespace WebHotlinkProtection 
  
{ 
  

     
  public  
  class HotlinkProtectionHandler:IHttpHandler 
  
    { 
  
         
  public  
  bool IsReusable 
  
        { 
  
             
  get {  
  throw  
  new NotImplementedException(); } 
  
        } 
  

         
  public  
  void ProcessRequest(HttpContext context) 
  
        { 
  
             
  // 
  监听是否本站发起的请求 
  
            
  if (!context.Request.UrlReferrer.Host.StartsWith( 
  " 
  localhost 
  ")) 
  
            { 
  
                context.Response.Expires =  
  0; 
  
                context.Response.Clear(); 
  
                context.Response.ContentType =  
  " 
  image/jpg 
  "; 
  
                 
  // 
  输出防盗链图片 
  
                context.Response.WriteFile(context.Request.PhysicalApplicationPath +  
  " 
  \\no.jpg 
  "); 
  
                context.Response.End(); 
  
            } 
  
             
  else 
  
           {  
  
                context.Response.Expires =  
  0; 
  
                context.Response.Clear(); 
  
                context.Response.ContentType =  
  " 
  image/jpg 
  "; 
  
                context.Response.WriteFile(context.Request.PhysicalPath); 
  
                context.Response.End(); 
  
            } 
  
        } 
  
    } 
  
} 
 

第二部：配置web.config

 

          
  < 
  httpHandlers 
  > 
  
           
  < 
  add  
  verb 
  ="*" 
   path 
  ="*.jpg" 
   type 
  ="WebHotlinkProtection.HotlinkProtectionHandler,WebHotlinkProtection" 
  /> 
  
       
  </ 
  httpHandlers 
  >