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 HelloWorldFilter extends GenericFilter {
8    
9        public void doFilter(final ServletRequest request, final ServletResponse response, FilterChain chain) throws java.io.IOException, javax.servlet.ServletException {
10           System.out.println("Entering Filter");
11           request.setAttribute("hello", "Hello World!");
12           chain.doFilter(request, response);
13           System.out.println("Exiting Filter");
14       }
15   }
16   
17   
18   
19