秒杀倒计时，jsp+js 获取服务器的时间

最新推荐文章于 2021-08-06 06:32:28 发布

cheney_0723

最新推荐文章于 2021-08-06 06:32:28 发布

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分类专栏： java综合文章标签： JSP HTML JavaScript ViewUI

本文链接：https://blog.youkuaiyun.com/mr_cheney/article/details/83811154

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本文介绍了一个使用Java实现服务器时间和客户端时间同步的方法，并通过实例展示了如何计算两个时间点之间的差值来实现倒计时功能。该方案利用JSP页面与JavaScript交互，获取服务器当前时间，并通过定时器不断更新剩余时间。

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
//引入工具包
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";

Calendar cal = Calendar.getInstance();
int hour = cal.get(cal.HOUR_OF_DAY);
int minute = cal.get(cal.MINUTE);
int month = cal.get(cal.MONTH);
int date = cal.get(cal.DATE);
int year = cal.get(cal.YEAR);
int second = cal.get(cal.SECOND);

%>

//获取服务器端时间

<script type="text/javascript">
var NowHour = "";//Today.getHours();
var NowMinute = "";//Today.getMinutes();
var NowMonth = "";//Today.getMonth();
var NowDate = "";//Today.getDate();
var NowYear = "";//Today.getYear();
var NowSecond = "";//Today.getSeconds();

//获取服务端时间
function getTime(){
NowHour = "<%=hour%>";//Today.getHours();
NowMinute = "<%=minute%>";//Today.getMinutes();
NowMonth = "<%=month%>";//Today.getMonth();
//NowMonth = (parseInt(NowMonth)+1);
NowDate = "<%=date%>";//Today.getDate();
NowYear = "<%=year%>";//Today.getYear();
NowSecond = "<%=second%>";//Today.getSeconds();
}

var yzm ;//验证码
getTime();
startclock();
var timerID = null;
var timerRunning = false;

var year = "";
var month= "";
var day= "";
var hour= "";
var minute= "";
var seconds= "";

function showtime() {
var time=$("#hiddenTime").val();//获取数据库中结束时间或开始时间，然后开始计算离开始或结束还差多少时间

splitTime(time);//以上用于截取时间，分成年，月，日，时，分，秒

//=========================================
//以下用于用于计算时间差
//Today = new Date();

//if (NowYear < 2000)
// NowYear = 1900 + NowYear;
//Today = null;
Hourleft = hour - NowHour;
Minuteleft = minute - NowMinute;
Secondleft = seconds - NowSecond;
Yearleft = year - NowYear;
Monthleft = month - NowMonth - 1;
Dateleft = day - NowDate;
NowSecond = (parseInt(NowSecond)+1);
//Secondleft = (parseInt(Secondleft)-1);
//秒钟
if (NowSecond > 60) {
NowSecond = NowSecond - 60;
NowMinute = (parseInt(NowMinute)+1);
}
if (Secondleft < 0) {
Secondleft = 60 + Secondleft;
Minuteleft = (parseInt(Minuteleft)-1);
}
//分钟
if (NowMinute >60) {
NowMinute = NowMinute - 60;
NowHour = (parseInt(NowHour)+1);
}
if (Minuteleft < 0) {
Minuteleft = 60 + Minuteleft;
Hourleft = (parseInt(Hourleft)-1);
}
//小时
if (NowHour >24) {
NowHour = NowHour - 24;
NowDate = (parseInt(NowDate)+1);
}
if (Hourleft < 0) {
Hourleft = 24 + Hourleft;
Dateleft = (parseInt(Dateleft)-1);
}
//天
if (NowDate > 31) {
NowDate = NowDate - 31;
NowMonth = (parseInt(NowMonth)+1);
}
if (Dateleft < 0) {
Dateleft = 31 + Dateleft;
Monthleft = (parseInt(Monthleft)-1);
}
//月
if (NowMonth >12 ) {
NowMonth = NowMonth - 12;
NowYear = (parseInt(NowYear)+1);
}
if (Monthleft < 0) {
Monthleft = 12 + Monthleft;
Yearleft = (parseInt(Yearleft)-1);
}

Hourleft = Dateleft * 24 + Hourleft ;
if(Hourleft<10){
Hourleft = "0"+Hourleft;
}
if(Minuteleft<10){
Minuteleft = "0"+Minuteleft;
}
if(Secondleft<10){
Secondleft = "0"+Secondleft;
}
//Temp = Hourleft + ':' + Minuteleft + ':' + Secondleft ;
var status = "${msActivity.status}";
if(status == 1||status == 2){
    if(Hourleft<100){
     Hourleft = '0'+Hourleft;

                     $("#timeup").html(Hourleft);

                     }
$("#timeup").html(Hourleft);
$("#timeup1").html(Minuteleft);
$("#timeup2").html(Secondleft);
if(Hourleft==0&&Minuteleft==0&&Secondleft==0){
window.location.reload();
}

}else{
$("#timeup").html("000");
$("#timeup1").html("00");
$("#timeup2").html("00");
}

setTimeout("showtime()", 1000);
//timerRunning = true;
}

//var timerID = null;
//var timerRunning = false;
//function stopclock() {
// if (timerRunning)
// clearTimeout(timerID);
// timerRunning = false;
//}
function startclock() {
//stopclock();
showtime(); //调用计算时间差方法，并显示
}
//以上用于计算时间差
//=============================================
function splitTime(time){
year=time.substr(0,4);
var index1=time.indexOf("-");
var index2=time.lastIndexOf("-");
var cha=parseInt(index2)-(parseInt(index1)+1);
month=time.substr((parseInt(index1)+1),cha);
var kg=time.indexOf(" ");
cha=parseInt(kg)-parseInt(index2);
day=time.substr(parseInt(index2)+1,cha);
var mh=time.indexOf(":");
cha=parseInt(mh)-(parseInt(kg)+1);
hour=time.substr(parseInt(kg)+1,cha);
var mh2=time.lastIndexOf(":");
cha=parseInt(mh2)-(parseInt(mh)+1);
minute=time.substr(parseInt(mh)+1,cha);
var mh2=time.lastIndexOf(":");
seconds=time.substr(parseInt(mh2)+1,2);