asp.net HttpHandler implements image hotlink prevention_javascript skills

Step.1: Create the file CustomHandler.cs with the following code:

Copy the code The code is as follows:

using System;
using System.Web;

namespace CustomHandler{
public class JpgHandler : IHttpHandler{
public void ProcessRequest(HttpContext context){
// Get the file server side Physical path
string FileName = context.Server.MapPath(context.Request.FilePath);
// If UrlReferrer is empty, a default hotlink-prohibited image will be displayed
if (context.Request .UrlReferrer.Host == null){
context.Response.ContentType = "image/JPEG";
context.Response.WriteFile("/error.jpg");
}else{
// If the UrlReferrer does not contain the domain name of your own site's host, a default picture that prohibits hotlinking will be displayed
if (context.Request.UrlReferrer.Host.IndexOf("yourdomain.com") > 0){
context.Response.ContentType = "image/JPEG";
context.Response.WriteFile(FileName);
}else{
context.Response.ContentType = "image/JPEG";
context.Response.WriteFile("/error.jpg");
}
}
}

public bool IsReusable{
get{ return true; }
}
}
}

Step.2 Compile this file

Copy the code The code is as follows :

csc /t:library /r:System.Web.dll CustomHandler.cs

Step.3 Copy the compiled CustomHandler.dll to the Bin of the site directory.
Step.4 Register this Handler in Web.Config.

Copy code The code is as follows:

OK, you can test it yourself according to the steps, so I won’t go into details here.