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copied!<p>I'm not sure whether it already exists, but you could easily write a <a href="http://www.oracle.com/technetwork/java/filters-137243.html" rel="nofollow">Filter</a> that checks whether there's a <code>Referer</code> header that matches the appropriate pattern (as described in the link you've posted).</p> <p><strong>EDIT:</strong> What <a href="http://www.dagondesign.com/articles/hotlink-protection-with-htaccess/" rel="nofollow">the article you've linked to</a> describes is a rule based on the <code>Referer</code> HTTP header (which is sent by browsers to indicate from which page the link was obtained). The following rules in <code>.htaccess</code> on Apache Httpd with <code>mod_rewrite</code> more or less mean, if the <code>Referer</code> header doesn't match the <code>http://(www\\.)?yoursite\\.com</code> pattern, then redirect to <code>/images/hotlink.jpeg</code>.</p> <pre><code>RewriteEngine on RewriteCond %{HTTP_REFERER} . RewriteCond %{HTTP_REFERER} !^http://(www\\.)?yoursite\\.com [NC] RewriteRule \\.(gif|jpe?g)$ /images/hotlink.$1 [L] </code></pre> <p>Filters are a standard mechanism in webapps for intercepting requests before they're sent to the servlet for processing (and they can chose not to redirect to the servlet if needed).</p> <p>You would override the <code>doFilter(ServletRequest request, ServletResponse response, FilterChain chain)</code> in your Filter, test whether <code>request.getHeader("Referer")</code> matches the right pattern, if so, call <code>chain.doFilter(request, response)</code>, otherwise send a redirection response to some other image (that would say "hotlink" or whatever), possibly with a 403 status code.</p>

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