response的setHeader的几种用法
<%@page contentType="text/html;charset=GBK" import="java.util.*" pageEncoding="GBK"%>
<%
response.setHeader("refresh","5");//第一种:每隔五秒钟页面自动刷新一次
response.setHeader("refresh","5;url=index.jsp");//第二种:设置浏览器延时跳转
Date now = new Date();
out.print(now);
//不缓存当前页面
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
%>