主要用到这一行代码：<meta http-equiv="refresh" content="1">
代码如下：
<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Date time = new Date();
int hour = time.getHours();
int min = time.getMinutes();
int second = time.getSeconds();
%>
当前的时间是：<%=hour %>:<%=min %>:<%=second %>
<meta http-equiv="refresh" content="1">
</body>
</html>