springboot定时任务自学之路-03（异步多线程定时任务）

短命女 2023-02-20 12:21 54阅读 0赞

默认是单线程的定时任务，如果任务持续时间比较长，就会将后续定时任务拖延，导致丢失任务。

所以这时候就需要开启异步多线程的定时任务。

分为两步：

1.开启异步@EnableAsync

2.将定时方法设置为异步执行@Async

上代码：

package com.test.springboot_schedule;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.Async;
    import org.springframework.scheduling.annotation.EnableAsync;
    import org.springframework.scheduling.annotation.EnableScheduling;
    import org.springframework.scheduling.annotation.Scheduled;
    
    @EnableAsync
    @EnableScheduling
    @SpringBootApplication
    public class SpringbootScheduleApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootScheduleApplication.class, args);
        }
    
        @Async
        //    @Scheduled(fixedRate = 30 * 1000)
        @Scheduled(cron = "0/30 * * * * ?")
        public void saySth() {
    
            System.out.println(Thread.currentThread().getName() + "--say hello world");
    
        }
    
        @Async
        //    @Scheduled(fixedRate = 60 * 1000)
        @Scheduled(cron = "0 0/1 * * * ?")
        public void doSth() {
    
            System.out.println(Thread.currentThread().getName() + "--do hello world");
    
        }
    }

执行结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIwNDUwNDU_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIwNDUwNDU_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200626223950929.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIwNDUwNDU=,size_16,color_FFFFFF,t_70