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;

/**
 * created by [e-mail] 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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