日期:2014-05-16 浏览次数:20361 次
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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