import java.io.*; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import java.util.Enumeration; public class ResponseFilter implements Filter { private FilterConfig filterConfig = null; public void destroy() { System.out.println("Filter destroyed"); this.filterConfig = null; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println("doFilter"); PrintWriter out = response.getWriter(); // this is added to the beginning of the PrintWriter out.println(""); out.println(""); out.println(""); out.println("Page header"); out.println("

"); chain.doFilter(request, response); // this is added to the end of the PrintWriter out.println("

"); out.println("Page footer"); out.println(""); out.println(""); out.println(""); } public void init(FilterConfig filterConfig) throws ServletException { System.out.println("Filter initialized"); this.filterConfig = filterConfig; } }