Java定时任务方案

谁借莪１个温暖的怀抱￠ 2023-10-14 21:55 20阅读 0赞

#### 一、Timer ####

import java.util.Timer;
    import java.util.TimerTask;
    
    public class TimerExample {
        public static void main(String[] args) {
            Timer timer = new Timer();
            TimerTask task = new TimerTask() {
                @Override
                public void run() {
                    System.out.println("Task executed at: " + System.currentTimeMillis());
                }
            };
    
            // 在延迟一段时间后执行任务
            timer.schedule(task, 1000,1000); // 1秒后执行 、每秒执行一次
        }
    }

#### 二、Excutors ####

import java.util.concurrent.Executors;
    import java.util.concurrent.ScheduledExecutorService;
    import java.util.concurrent.TimeUnit;
    
    public class ScheduledExecutorExample {
        public static void main(String[] args) {
            ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
    
            Runnable task = () -> {
                System.out.println("Task executed at: " + System.currentTimeMillis());
            };
    
            // 在延迟一段时间后执行任务，然后每隔一段时间重复执行
            scheduler.scheduleAtFixedRate(task, 1, 1, TimeUnit.SECONDS);
        }
    }

#### 三、quartz框架 ####

<dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
        <version>2.3.2</version>
    </dependency>

import org.quartz.*;
    import org.quartz.impl.StdSchedulerFactory;
    
    public class QuartzExample {
        public static void main(String[] args) throws SchedulerException {
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
    
            JobDetail job = JobBuilder.newJob(MyJob.class)
                    .withIdentity("myJob", "group1")
                    .build();
    
            Trigger trigger = TriggerBuilder.newTrigger()
                    .withIdentity("myTrigger", "group1")
                    .startNow()
                    .withSchedule(SimpleScheduleBuilder.simpleSchedule()
                            .withIntervalInSeconds(2)
                            .repeatForever())
                    .build();
    
            scheduler.scheduleJob(job, trigger);
            scheduler.start();
        }
    }
    
    class MyJob implements Job {
        @Override
        public void execute(JobExecutionContext context) throws JobExecutionException {
            System.out.println("Job executed at: " + System.currentTimeMillis());
        }
    }

#### 四、springboot中@Schedule注解 ####