public class ShowTime extends HttpServlet {
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws servletexception,IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
String time = sdf.format(new Date());
out.println(time);
}
}
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>动态显示时钟</title>
</head>
<body>
<input type="button" id="start" value="开始显示">
<input type="button" id="stop" value="停止显示">
<div id="showtime"></div>
</body>
<script type="text/javascript">
window.onload = function(){
var t;
document.getElementById("start").onclick = showtime;
document.getElementById("stop").onclick = function(){
clearTimeout(t);
}
function showtime(){
var xhr = ajaxFunction();
xhr.onreadystatechange = function(){
if(xhr.readyState==4){
if(xhr.status==200){
var data = xhr.responseText;
document.getElementById("showtime").innerHTML = "<h1>"+data+"</h1>";
}
}
}
xhr.open("get","showTime?timeStamp="+new Date().getTime(),true);
xhr.send(null);
t = setTimeout(showtime,1000);
}
function ajaxFunction(){
var xmlHttp;
try{ // Firefox,Opera 8.0+,Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return xmlHttp;
}
}
</script>
</html>
总结 其实 b/s不支持服务器主推服务
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