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把从数据库中读出的时间赋值给javascript变量，然后用javascript实现倒计时，我简单写了下，你看看对你是否有帮助，把<%=30%>的30换成从数据库中取出的时间即可。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'B.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page. <br>
<script type="text/javascript">
var time=<%=30%>;
var t = setInterval("f1()", 1000);
function f1()
{
document.all("time").innerHTML="剩余"+time+"秒";
time--;
if(time<0)
{
clearInterval(t);
}
}
</script>
<div id="time">
这里用来显示时间
</div>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'B.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page. <br>
<script type="text/javascript">
var time=<%=30%>;
var t = setInterval("f1()", 1000);
function f1()
{
document.all("time").innerHTML="剩余"+time+"秒";
time--;
if(time<0)
{
clearInterval(t);
}
}
</script>
<div id="time">
这里用来显示时间
</div>
</body>
</html>
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