定时任务
1、@EnableScheduling 开启定时任务 2、@Scheduled 开启一个定时任务
Cron表达式:Cron - 在线Cron表达式生成器
1、Spring中6位组成,不允许第7位的年,顺序:秒 分 时 日 月 周? 2、在周几的位置,1-7代表周一到周日:MON-SUN 3、定时任务不应该阻塞。默认是阻塞 ????????1)、可以让业务运行以异步的方式,自己提交到线程池 CompletableFuture ????????2)、支持定时任务线程池 ?task.scheduling.pool.size=5
package com.hdb.pingmoweb.seckill.scheduled;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Slf4j
@Component
@EnableScheduling
public class HelloSchedule {
@Scheduled(cron = "* * * ? * 1")
public void hello() throws InterruptedException {
log.info("hello...");
}
}
异步任务
1、@EnableAsync 开启异步任务功能
2、@Async 给希望异步执行的方法上标注
使用要配置task任务线程池大小
spring:
task:
execution:
pool:
core-size: 20
max-size: 50
package com.hdb.pingmoweb.seckill.scheduled;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Slf4j
@Component
@EnableAsync
@EnableScheduling
public class HelloSchedule {
@Async
@Scheduled(cron = "* * * ? * 1")
public void hello() throws InterruptedException {
log.info("hello...");
}
}
@EnableAsync,@EnableScheduling 多个Schedule类只需要开启一次,通常写个配置类ScheduledConfig
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
@EnableAsync
@EnableScheduling
@Configuration
public class ScheduledConfig {
}
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