定时任务每天2点12点下午5点执行

以下是Java中定时任务每天2点、12点和下午5点执行的示例代码：

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class TimerManager {
    public static void main(String[] args) {
        Timer timer = new Timer();

        // 设置每天2点执行任务
        Calendar calendar1 = Calendar.getInstance();
        calendar1.set(Calendar.HOUR_OF_DAY, 2);
        calendar1.set(Calendar.MINUTE, 0);
        calendar1.set(Calendar.SECOND, 0);
        Date date1 = calendar1.getTime();
        if (date1.before(new Date())) {
            date1 = addDay(date1, 1);
        }
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                // 执行任务的代码
                System.out.println("任务1：每天2点执行");
            }
        }, date1, 24 * 60 * 60 * 1000);

        // 设置每天12点执行任务
        Calendar calendar2 = Calendar.getInstance();
        calendar2.set(Calendar.HOUR_OF_DAY, 12);
        calendar2.set(Calendar.MINUTE, 0);
        calendar2.set(Calendar.SECOND, 0);
        Date date2 = calendar2.getTime();
        if (date2.before(new Date())) {
            date2 = addDay(date2, 1);
        }
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                // 执行任务的代码
                System.out.println("任务2：每天12点执行");
            }
        }, date2, 24 * 60 * 60 * 1000);

        // 设置每天下午5点执行任务
        Calendar calendar3 = Calendar.getInstance();
        calendar3.set(Calendar.HOUR_OF_DAY, 17);
        calendar3.set(Calendar.MINUTE, 0);
        calendar3.set(Calendar.SECOND, 0);
        Date date3 = calendar3.getTime();
        if (date3.before(new Date())) {
            date3 = addDay(date3, 1);
        }
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                // 执行任务的代码
                System.out.println("任务3：每天下午5点执行");
            }
        }, date3, 24 * 60 * 60 * 1000);
    }

    // 增加一天
    private static Date addDay(Date date, int num) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DAY_OF_MONTH, num);
        return calendar.getTime();
    }
}