灵活控制任务执行时间的Cron表达式范例

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javaCopy codeimport org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;
public class CronJobExample {
    public static void main(String[] args) {
        try {
            // 创建调度器
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
            // 定义JobDetail
            JobDetail job = JobBuilder.newJob(MyJob.class)
                    .withIdentity("myJob", "group1")
                    .build();
            // 定义CronTrigger
            Trigger trigger = TriggerBuilder.newTrigger()
                    .withIdentity("myTrigger", "group1")
                    .withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 * * ?")) // 设置Cron表达式
                    .build();
            // 注册JobDetail和Trigger到调度器
            scheduler.scheduleJob(job, trigger);
            // 启动调度器
            scheduler.start();
        } catch (SchedulerException e) {
            e.printStackTrace();
        }
    }
    public static class MyJob implements Job {
        public void execute(JobExecutionContext context) throws JobExecutionException {
            // 定时任务的逻辑代码
            System.out.println("执行定时任务...");
        }
    }
}

javaCopy codeimport org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class ReminderJobExample {
    public static void main(String[] args) {
        try {
            // 创建调度器
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
            // 定义JobDetail
            JobDetail job = JobBuilder.newJob(ReminderJob.class)
                    .withIdentity("reminderJob", "group1")
                    .build();
            // 定义CronTrigger
            Trigger trigger = TriggerBuilder.newTrigger()
                    .withIdentity("reminderTrigger", "group1")
                    .withSchedule(CronScheduleBuilder.cronSchedule("0 0 9 * * ?")) // 设置Cron表达式，每天早上9点执行
                    .build();
            // 注册JobDetail和Trigger到调度器
            scheduler.scheduleJob(job, trigger);
            // 启动调度器
            scheduler.start();
        } catch (SchedulerException e) {
            e.printStackTrace();
        }
    }
    public static class ReminderJob implements Job {
        public void execute(JobExecutionContext context) throws JobExecutionException {
            // 获取当前时间
            LocalDateTime now = LocalDateTime.now();
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            String currentTime = now.format(formatter);
            // 发送提醒邮件
            String recipient = "example@example.com";
            String subject = "每日提醒";
            String content = "当前时间：" + currentTime + "，请记得完成今天的任务。";
            sendEmail(recipient, subject, content);
        }
        private void sendEmail(String recipient, String subject, String content) {
            // 实现发送邮件的逻辑
            // ...
            System.out.println("发送邮件给：" + recipient);
            System.out.println("主题：" + subject);
            System.out.println("内容：" + content);
        }
    }
}