ajax+jsp+servlet 兑现动态显示系统当前时间
日期：2014-05-16 浏览次数：20415 次
ajax+jsp+servlet 实现动态显示系统当前时间
1. showCurrentTime.jsp
<%@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<!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=gb2312">
<title>动态显示系统当前时间</title>
</head>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<script>
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
}else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
}
function exec(){
createXMLHttpRequest();
xmlHttp.open("post","<%=basePath %>"+"timeUpdate",true);
xmlHttp.onReadyStateChange = handleFun;
xmlHttp.send(null);
}
function handleFun(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
document.getElementById("div").innerText = xmlHttp.responseTEXT;
}
}
}
setInterval("exec()",1000);
</script>
<body>
你好！
TimeUpdateServlet路径:<%=basePath %>
<div id="div"></div>
</body>
</html>
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2. TimeUpdateServlet.java
package com.ibm.user.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.DateFormat;
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 TimeUpdateServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
Date date = new Date();
DateFormat dformater = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String currentTime = dformater.format(date);
PrintWriter out = response.getWriter();
out.println(currentTime);
out.flush();
out.close();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}
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3.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>xg3</display-name>
<servlet>
<description></description>
<display-name>TimeUpdateServlet</display-name>
<servlet-name>TimeUpdateServlet</servlet-name>
<servlet-class>com.ibm.user.web.TimeUpdateServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TimeUpdateServlet</servlet-name>
<url-pattern>/timeUpdate</url-pattern>
</servlet-mapping>
</web-app>
?
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