public class FiltIp implements Filter {private FilterConfig filterConfig;private int startIp;private int endIp;public void destroy() { }public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {HttpServletRequest request =(HttpServletRequest)arg0;HttpServletResponse response =(HttpServletResponse)arg1;String strstartIp=filterConfig.getInitParameter("startIp");String strendIp=filterConfig.getInitParameter("endIp");request.setAttribute("strstartIp", strstartIp);request.setAttribute("strendIp", strendIp);startIp=Integer.parseInt(strstartIp.replace(".", ""));endIp=Integer.parseInt(strendIp.replace(".", ""));String reqIP= request.getRemoteAddr();request.setAttribute("reqIP", reqIP);reqIP=reqIP.replace(".", "");int ip=Integer.parseInt(reqIP);if(ip<startIp||ip>endIp){request.getRequestDispatcher("/last/filtIp.jsp").forward(request, response);}System.out.println("request的過濾");arg2.doFilter(arg0, arg1);System.out.println("response的過濾"); }public void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stubthis.filterConfig=arg0;}}