SpringBoot任务调度器的实现代码

SpringBoot自带了任务调度器，通过注解的方式使用。

启用方式: 在配置类上注解 org.springframework.scheduling.annotation.EnableScheduling

Java示例

package bj.scheduler;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.annotation.Schedules;

import java.time.LocalDateTime;


@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableScheduling
@Slf4j
public class SchedulerApp {

  public static void main(String[] args) throws InterruptedException {
    SpringApplication.run(SchedulerApp.class, args);
    Thread.currentThread().join();
  }

  @Schedules({
      @Scheduled(fixedRate = 1000),
      @Scheduled(fixedDelay = 1001),
      @Scheduled(cron = "* * * * * *")
  })
  public void sayHello() {
    log.info("{} Hello", LocalDateTime.now());
  }
}

要点

• @EnableScheduling 启用任务调度器
• @Schedules 组合多个调度器。多个调度器全部启用。
• @Scheduled 单个调度器的配置
• fixedRate 固定执行频率(毫秒)，不计执行耗时
• fixedDelay 固定执行延迟(毫秒)，表示距离上次执行完毕的时长
• cron CronTab调度格式，第一位表示秒

控制台输出

 .  ____     _      __ _ _
 /\ / ___'_ __ _ _(_)_ __ __ _    
( ( )___ | '_ | '_| | '_ / _` |    
 \/ ___)| |_)| | | | | || (_| | ) ) ) )
 ' |____| .__|_| |_|_| |___, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::    (v2.1.0.RELEASE)

2018-12-12 15:01:00.332 INFO 34660 --- [      main] bj.scheduler.SchedulerApp : Starting SchedulerApp on MacBook-Air-2.local with PID 34660 (/Users/yuchao/temp/java/hellomaven/target/classes started by yuchao in /Users/yuchao/temp/java/hellomaven)
2018-12-12 15:01:00.339 INFO 34660 --- [      main] bj.scheduler.SchedulerApp : No active profile set, falling back to default profiles: default
2018-12-12 15:01:02.395 INFO 34660 --- [      main] o.s.s.c.ThreadPoolTaskScheduler     : Initializing ExecutorService 'taskScheduler'
2018-12-12 15:01:02.496 WARN 34660 --- [      main] reactor.netty.tcp.TcpResources      : [http] resources will use the default LoopResources: DefaultLoopResources {prefix=reactor-http, daemon=true, selectCount=4, workerCount=4}
2018-12-12 15:01:02.498 WARN 34660 --- [      main] reactor.netty.tcp.TcpResources      : [http] resources will use the default ConnectionProvider: PooledConnectionProvider {name=http, poolFactory=reactor.netty.resources.ConnectionProvider$$Lambda$278/687399269@6594402a}
2018-12-12 15:01:02.707 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:02.707 Hello
2018-12-12 15:01:02.707 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:02.707 Hello
2018-12-12 15:01:02.708 INFO 34660 --- [      main] bj.scheduler.SchedulerApp : Started SchedulerApp in 3.257 seconds (JVM running for 4.997)
2018-12-12 15:01:03.004 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:03.004 Hello
2018-12-12 15:01:03.704 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:03.704 Hello
2018-12-12 15:01:03.710 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:03.710 Hello
2018-12-12 15:01:04.002 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.002 Hello
2018-12-12 15:01:04.702 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.702 Hello
2018-12-12 15:01:04.712 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.712 Hello
2018-12-12 15:01:05.000 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05 Hello
2018-12-12 15:01:05.700 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05.700 Hello
2018-12-12 15:01:05.716 INFO 34660 --- [  scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05.716 Hello

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