reate a <filter> entry in your web.xml file. code example

Example 1: filters in xml

package demotest; import java.io.IOException;import java.util.Date; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import Javax.servlet.http.HttpServletRequest;  public class GuruFilter implements Filter {		public void doFilter(ServletRequest request, ServletResponse response, Filterchain chain) throws IOException, ServletException {		// TODO Auto-generated method stub 		HttpServletRequest req = (HttpServletRequest) request;						String ipAddress = req.getRemoteAddr(); 		System.out.println("IP Address "+ipAddress + ", Time is" 							+ new Date().toString());				// pass the request along the filter chain 		chain.doFilter(request, response);	}		/**	* @see Filter#init(FilterConfig)	*/ 	public void init(FilterConfig fConfig) throws ServletException {	String guruparam = fConfig.getInitParameter("guru-param");		//Print the init parameter 	System.out.println("Test Param: " + guruparam);	}}

Example 2: filters in xml

<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">	<display-name>	test</display-name>	<filter>		<description>		</description>		<display-name>		GuruFilter</display-name>		<filter-name>GuruFilter</filter-name>		<filter-class>demotest.GuruFilter</filter-class>		<init-param>		<param-name>guru-param</param-name>		<param-value>This is guru paramter</param-value>	</init-param>	</filter>	<filter-mapping>	   <filter-name>GuruFilter</filter-name>	   <url-pattern>/GuruFilter</url-pattern>	</filter-mapping>