1    package com.acme.filter; 
2     
3    import javax.servlet.FilterChain; 
4    import javax.servlet.ServletRequest; 
5    import javax.servlet.ServletResponse; 
6     
7    public class MessageFilter extends GenericFilter { 
8        public void doFilter(final ServletRequest request, final ServletResponse response, FilterChain chain) throws java.io.IOException, javax.servlet.ServletException { 
9            String message = null; 
10           System.out.println("Entering Filter"); 
11           message = getFilterConfig().getInitParameter("message"); 
12           request.setAttribute("message", message); 
13           chain.doFilter(request, response); 
14           System.out.println("Exiting Filter"); 
15       } 
16   } 
17