SpringBoot任务调度器的实现代码_Java教程

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

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									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

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									.  ____     _      __ _ _

									 /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \

									( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

									 \\/ ___)| |_)| | | | | || (_| | ) ) ) )

									 ' |____| .__|_| |_|_| |_\__, | / / / /

									 =========|_|==============|___/=/_/_/_/

									 :: 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