Java 如何使用timertask在特定时间执行代码
嗨,这是我的听众课Java 如何使用timertask在特定时间执行代码,java,listener,timertask,Java,Listener,Timertask,嗨,这是我的听众课 public void contextInitialized(ServletContextEvent arg0) { // TODO Auto-generated method stub System.out.println("inside listener context"); Timer timer = new Timer(); Calendar cal = Calendar.getInstance(); cal.set(Calendar.HOUR_OF_DAY,
public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("inside listener context");
Timer timer = new Timer();
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 19);
cal.set(Calendar.MINUTE, 00);
cal.set(Calendar.SECOND, 00);
Time sqlTime4 = new Time(cal.getTime().getTime());
timer.schedule(new MyTimerTask(),sqlTime4);
}
这是我的timertask类
package com.uttara.reg;
import java.util.Date;
import java.util.TimerTask;
public class Timer extends TimerTask {
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("inside run of timer");
}
public void scheduleAtFixedRate(TimerTask timerTask, Date executionDate, long period)
{
System.out.println("run");
// TODO Auto-generated method stub
}
}
该任务在特定事件中不会触发,有人可以纠正其中的问题吗
提前感谢您为什么要创建自己的计时器类?您应该重用java.util.Timer中的计时器类 只需使用下面的代码并删除Timer类
public static void main(final String[] args) {
System.out.println("inside listener context");
final Timer timer = new Timer();
final Date executionDate = new Date();
final long period = 24 * 60 * 60 * 1000;
timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
System.out.println("inside lisner run con");
}
}, executionDate,
period);
确保已导入正确的计时器类
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
代码中存在多个问题,如下所示:
Timer
是在java.util
包中定义的类,用于创建计划任务 public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("inside listener context");
Timer timer = new Timer();
Date executionDate = new Date();
long period = 24 * 60 * 60 * 1000;
timer.scheduleAtFixedRate(new MyTimerTask(), executionDate, period);
}
MyTimerTask
package com.uttara.reg;
import java.util.Date;
import java.util.TimerTask;
public class MyTimerTask extends TimerTask {
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("inside run of timer");
}
public void scheduleAtFixedRate(TimerTask timerTask, Date executionDate, long period)
{
System.out.println("run");
// TODO Auto-generated method stub
}
}
希望这是有帮助的,我上面更新的代码将在晚上7:00运行感谢你的帮助,此代码运行良好,但我想确认一件事,从你我的要求,我想在每天晚上8:00发送邮件,我怎么能在该代码中设置它你可以使用计时器在晚上8点运行一次性任务,但不是每天晚上8点重复的任务,除非您的初始任务启动另一个计时器以24小时间隔运行。那太乱了。相反,请参见