过滤器实例 //doFilter方法 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,ServletException f response.setContentType("text/html; charset=GB2312"); PrintWriter out=response.getWriter(); out.printIn("before doFilter()"); chain.doFilter(request,response); out.println("after doFilter()"); out.close();过滤器实例 //doFilter方法 public void doFilter(ServletRequestrequest, ServletResponse response, FilterChain chain) throws IOException, ServletException { response.setContentType("text/html; charset=GB2312"); PrintWriter out=response.getWriter(); out.println("before doFilter()"); chain.doFilter(request, response); out.println("after doFilter()"); out.close(); ｝