filter replacing content

filter.java

// the filter:

	@Override
	public void doFilter(
			ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain filterChain)
		throws IOException, ServletException {

		HttpServletRequest request = (HttpServletRequest) servletRequest;
		HttpServletResponse response = (HttpServletResponse) servletResponse;

		/*
		 Apply only on the appropriate site (assuming you defined the virtual host to the site public pages)
		 */
		String siteVirtualHost = "localhost";

		if(!request.getServerName().equals(siteVirtualHost)) {
			filterChain.doFilter(servletRequest, servletResponse);
			return;
		}

		/*
		  Cache response
		 */
		GenericServletResponse bufferedResponse = new GenericServletResponse(response);

		filterChain.doFilter(servletRequest, bufferedResponse);

		byte[] text = bufferedResponse.getData();

		String xml = new String(text, "UTF-8");

		/*
		Remove the lines from the XML
		 */

		// just testing ... :)
		xml = xml.replaceAll("localhost", "testtesttest");

		response.getWriter().write(xml);
	}

// liferay-hook.xml mapping:
	<servlet-filter-mapping>
		<servlet-filter-name>Sample Filter</servlet-filter-name>
		<after-filter>GZip Filter</after-filter>
		<url-pattern>/c/layouts_admin/sitemap</url-pattern>
		<dispatcher>REQUEST</dispatcher>
		<dispatcher>FORWARD</dispatcher>
	</servlet-filter-mapping>