Jsp/servlet and ajax implement simple partial date time update

Reference document: rookie tutorial: http://www.runoob.com/

Reprinted document: http://www.cnblogs.com/zmjh/p/8886905.html

Request jsp page: index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>zmjh_time</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">
  </head>
  
  <body>
    <input  type="text" name="time" value="当前时间：" readonly="true"/>
    <input  type="text" name="time" value="" id="time" readonly="true"/>
    <script type="text/javascript" language='javascript'>
function timee()
{
    var xmlhttp;
    if (window.XMLHttpRequest)
    {
        xmlhttp=new XMLHttpRequest();
    }
    else
    {
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");//IE
    }
    xmlhttp.onreadystatechange=function()
    {
        if (xmlhttp.readyState==4 && xmlhttp.status==200)//The request is successful
        {
            document.getElementById("time").value=xmlhttp.responseText;
        }
    }
    xmlhttp.open("GET","time?canshu=time",true);
    //xmlhttp.open("GET","time.jsp?canshu=time",true);
    xmlhttp.send();
}
window.setInterval("timee()",1000);
    </script>
  </body>
</html>

The requested jsp page: time.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ page  import="java.io.*" %>
<%@ page  import="java.text.SimpleDateFormat" %>
<%@ page  import="java.util.Date" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>zmjh_time</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">
  </head>
 
  <body>
   <%
        Date day=new Date();    
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        response.getWriter().println(df.format(day));   
    %>
  </body>
</html>

Requested servlet page: time.java:

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class time extends HttpServlet {
    public time() {
        super();
    }
    public void destroy() {
        super.destroy();
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();
            if(request.getParameter("canshu").equals("time")){
                Date day=new Date();    
                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                out.println(df.format(day));   
            }else{
                response.setStatus(400, "You are not requesting time, so you cannot respond!");
            }
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request,response);
    }
    public void init() throws ServletException {
    }

}

Jsp/servlet and ajax implement simple partial date time update

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