How to enable PUT and DELETE method in sastruts

RestfulActionServlet.java

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionServlet;

@SuppressWarnings("serial")
public class RestfulActionServlet extends ActionServlet {
	public void doPut(HttpServletRequest request, HttpServletResponse response)
			throws IOException, ServletException {
		process(request, response);
	}

	public void doDelete(HttpServletRequest request,
			HttpServletResponse response) throws IOException, ServletException {
		process(request, response);
	}

}

web.xml

    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>xxx.RestfulActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>configFactory</param-name>
            <param-value>org.seasar.struts.config.S2ModuleConfigFactory</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>