<!DOCTYPE html>
<html>
<head>
<title>index.html</title>
<meta name="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<h2 id="tt"></h2>
<script>
function i(id){
return document.getElementById(id);
}
var ajax=
new XMLHttpRequest;
ajax.onreadystatechange=
ok;
function ok(){
if(ajax.status==200&&ajax.readyState==4
){
i('tt').innerHTML=
ajax.responseText;
}
}
function aa(){
ajax.open("post","timer"
);
ajax.send(null);
}
aa();
setInterval(aa,1000
);
</script>
</body>
</html>
package web11_ajax.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/timer"
)
public class Timer
extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = 1L
;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8"
);
String timer=
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(
new Date());
PrintWriter out=
response.getWriter();
out.print(timer);
out.close();
}
}
转载于:https://www.cnblogs.com/fqszywz/p/7197114.html
相关资源：jquery ajax servlet json简单demo
