一、问题
项目采用springboot搭建，想给方法添加@Scheduled注解，实现两个定时任务。可是运行发现，两个task并没有并发执行，而是执行完一个task才会执行另外一个。上代码：
package com.autohome.contentplatform.tasks; import org.springframework.beans.factory.annotation.Configurable; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; @Component @Configurable @EnableScheduling public class task1 { @Scheduled(cron = "0/5 * * * * ? ") public void startSchedule() { System.out.println("===========1=>"); try { for(int i=1;i<=10;i++){ System.out.println("=1==>"+i); Thread.sleep(1000); } } catch (InterruptedException e) { e.printStackTrace(); } } @Scheduled(cron = "0/5 * * * * ? ") public void startSchedule2() { for(int i=1;i<=10;i++){ System.out.println("=2==>"+i); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }
运行发现任务没有并行执行。
二、解决
给类添加注解@EnableAsync，并给方法添加注解@Async。
@Component @Configurable @EnableScheduling @EnableAsync public class DemoTask { @Async @Scheduled(cron = "0/5 * * * * ? ") public void startSchedule() { System.out.println("===========1=>"); try { for(int i=1;i<=10;i++){ System.out.println("=1==>"+i); Thread.sleep(1000); } } catch (InterruptedException e) { e.printStackTrace(); } } @Async @Scheduled(cron = "0/5 * * * * ? ") public void startSchedule2() { for(int i=1;i<=10;i++){ System.out.println("=2==>"+i); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }
再次运行，发现两个任务可以并发执行了。
三、参考资料：
https://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/scheduling.html
