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SpringBoot任務調(diào)度器的實現(xiàn)代碼

 更新時間：2018年12月13日 10:28:40   作者：白季飛龍  
SpringBoot自帶了任務調(diào)度器，通過注解的方式使用。小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

SpringBoot自帶了任務調(diào)度器，通過注解的方式使用。

啟用方式: 在配置類上注解 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;

/**
 * Created by BaiJiFeiLong@gmail.com at 2018/12/12 下午2:51
 */
@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());
  }
}

要點

  • @EnableScheduling 啟用任務調(diào)度器
  • @Schedules 組合多個調(diào)度器。多個調(diào)度器全部啟用。
  • @Scheduled 單個調(diào)度器的配置
  • fixedRate 固定執(zhí)行頻率(毫秒)，不計執(zhí)行耗時
  • fixedDelay 固定執(zhí)行延遲(毫秒)，表示距離上次執(zhí)行完畢的時長
  • cron CronTab調(diào)度格式，第一位表示秒

控制臺輸出

 .  ____     _      __ _ _
 /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/ ___)| |_)| | | | | || (_| | ) ) ) )
 ' |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: 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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