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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class AuditFilter extends HttpServlet implements Filter, SingleThreadModel {
private FilterConfig filterConfig = null;
public void init(FilterConfig filterConfig)
throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
if (filterConfig == null)
return;
StringBuffer buf = new StringBuffer();
buf.append ("The number of hits is: ");
synchronized (this) {
Integer counter = (Integer)filterConfig.getServletContext().getAttribute("Counter");
counter = new Integer(counter.intValue() + 1);
buf.append (counter.toString());
filterConfig.getServletContext().log(buf.toString());
filterConfig.getServletContext().setAttribute("Counter", counter);
}
chain.doFilter(req, res);
}
}