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 BaiJiFeiLong@gmail.com at 2018/12/12 下午2:51 */@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)@EnableScheduling@Slf4jpublic 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: default2018-12-12 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 Hello2018-12-12 15:01:02.707 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:02.707 Hello2018-12-12 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 Hello2018-12-12 15:01:03.704 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:03.704 Hello2018-12-12 15:01:03.710 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:03.710 Hello2018-12-12 15:01:04.002 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.002 Hello2018-12-12 15:01:04.702 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.702 Hello2018-12-12 15:01:04.712 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:04.712 Hello2018-12-12 15:01:05.000 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05 Hello2018-12-12 15:01:05.700 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05.700 Hello2018-12-12 15:01:05.716 INFO 34660 --- [ scheduling-1] bj.scheduler.SchedulerApp : 2018-12-12T15:01:05.716 Hello

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