java定时器源代码_居家养老系统的JAVA源代码

编写一个java定时器 每隔5秒钟向数据库表中添加一条数据 求助应该咋写啊 求具体代码

import java.util.Timer;

import java.util.TimerTask;

public class Test extends TimerTask {

public static void main(String[] args) {

Timer timer = new Timer();

Test t=new Test();

//程序运行后立刻执行任务,每隔1000ms执行一次

timer.schedule(t, 0, 1000);

}

@Override

public void run() {

System.out.println("在此处调用插入数据库的方法");

求一个简单的Java定时器源代码

我是让它每10毫秒扫描一下.

Calendar ca=null;

Calendar ca1=null;

Timer timer=new Timer();

static Connection con=null;

public void chu(){

ca=Calendar.getInstance();

ca1=(Calendar)ca.clone();

public void Time(){

float s=ca1.get(Calendar.SECOND)-ca.get(Calendar.SECOND)◆(ca1.get(Calendar.MILLISECOND)-ca.get(Calendar.MILLISECOND))/1000f;

if(con==null){

System.out.println("耗时"◆String.valueOf(s)◆"秒");

if(ca.after(ca1)){

System.out.println("取不到连接");

timer.cancel();

return ;

}else{

ca.add(Calendar.MILLISECOND, 10);

timer.schedule(

new TimerTask() {

System.out.println("时间在溜走....");

Time();

}, ca.getTime());

void getcon(){

Connection con=null;//获取Connection

chu();

java写一个定时器,定时对一个变量赋不同值,这个程序代码怎么写

import?java.util.Random;

import?java.util.Timer;

import?java.util.TimerTask;

public?class?MainEntry?{

private?int?a;

public?void?setVal(){

Timer?timer?=?new?Timer();

//每隔一秒生成一个[1,100)内的随机整数,赋给成员a

timer.schedule(new?TimerTask()?{?

public?void?run()?{

Random?rand?=?new?Random();

setA(rand.nextInt(100));

},?1000);

public?void?setA(int?a)?{

this.a?=?a;

public?int?getA()?{

return?a;

public?static?void?main(String[]?args)?{

MainEntry?me?=?new?MainEntry();

me.setVal();

求java的计时器代码,应该比较简单的,来看看吧.

package?test;

import?java.util.*;

import?java.awt.*;

import?java.awt.event.*;

import?java.applet.*;

private?final?Panel?pan?=?new?Panel();

private?final?Label?time?=?new?Label();

private?final?Button?btnGo?=?new?Button("开始");

private?final?Button?btnPouse?=?new?Button("暂停");

private?final?Button?btnReset?=?new?Button("复位");

private?final?StopwatchThread?swThread?=?new?StopwatchThread();

private?class?btnGoListener?implements?ActionListener?{

public?void?actionPerformed(ActionEvent?e)?{

swThread.go();

btnGo.setEnabled(false);

private?class?btnPouseListener?implements?ActionListener?{

if(btnGo.isEnabled()){

return?;

if?(btnPouse.getLabel().equals("继续"))?{

btnPouse.setLabel("暂停");

}?else?if?(btnPouse.getLabel().equals("暂停"))?{

swThread.noGo();

btnPouse.setLabel("继续");

private?class?btnResetListener?implements?ActionListener?{

swThread.reset();

btnGo.setEnabled(true);

btnGo.setLabel("开始");

private?class?StopwatchThread?extends?Thread?{

private?boolean?going?=?false;

private?long?prevElapsed?=?0;

private?Date?startDate?=?new?Date();

private?long?elapsedTime()?{

return?prevElapsed?◆

(going?new?Date().getTime()?-?startDate.getTime()?:?0);

private?String?msToString(long?time)?{

String?ms,?sec,?min;

ms?=?Long.toString(time?%?1000);

ms?=?"0"?◆?ms;

ms?=?ms.substring(0,?ms.length()?-?1);

time?/=?1000;

if?(sec.length()?==?1)?sec?=?"0"?◆?sec;

min?=?Long.toString(time);

return?min?◆?":"?◆?sec?◆?"."?◆?ms;

public?void?go()?{

startDate?=?new?Date();

going?=?true;

public?void?noGo()?{

prevElapsed?=?elapsedTime();

going?=?false;

public?void?reset()?{

prevElapsed?=?0;

while?(true)?{

time.setText(msToString(elapsedTime()));

yield();

public?void?init()?{

setBackground(Color.lightGray);

setForeground(Color.black);

pan.add(new?Label("计时:"));

time.setForeground(Color.blue);

pan.add(time);

pan.add(btnGo);

pan.add(btnPouse);

pan.add(btnReset);

pan.add(new?Label());

add(pan);

btnGo.addActionListener(new?btnGoListener());

btnReset.addActionListener(new?btnResetListener());

btnPouse.addActionListener(new?btnPouseListener());

swThread.setDaemon(true);

swThread.start();

Frame?aFrame?=?new?Frame("计时器");

aFrame.addWindowListener(new?WindowAdapter()?{

public?void?windowClosing(WindowEvent?e)?{

System.exit(0);

});

aFrame.add(applet,?BorderLayout.CENTER);

applet.init();

applet.start();

aFrame.setVisible(true);

可以改变有注释的那个if语句里面的值来判断什么时候停止

java定时器

import?java.io.IOException;

public?class?TimerTest?{

while?(true)?{//?这个是用来停止此任务的,否则就一直循环执行此任务了

try?{

int?ch?=?System.in.read();

if?(ch?-?'c'?==?0)?{

timer.cancel();//?使用这个方法退出任务

}?catch?(IOException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

static?class?MyTask?extends?java.util.TimerTask?{

//?TODO?Auto-generated?method?stub

System.out.println("________");

这段代码基本能满足你需求了 你还有需求就在上面再套一层job 当然如过太复杂了而且这种定时需求很多的话 建议用quartz框架 使用很简单

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