springboot实现定时任务的一种方式

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-task-core</artifactId>
        </dependency>            

server:
  port: 55550

#日志
logging:
  file: ./logs/apple.log

spring: 
  application: 
    name: asfood-apple

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:55580/eureka/

#详情[parent/asfood]/doc_nn/cron.txt
tasktime_cron: 0/20 * 14,15 * * ?

@Configuration
public class TaskTest {
    private static int i = 0;
    
    /**
    cron：指定cron表达式。
    fixedDelay：
        官方文档解释：An interval-based trigger where the interval is measured from the completion time of the previous task. 
        The time unit value is measured in milliseconds.
        即表示从上一个任务完成开始到下一个任务开始的间隔，单位是毫秒。
    fixedRate：
        官方文档解释：An interval-based trigger where the interval is measured from the start time of the previous task. 
        The time unit value is measured in milliseconds.
        即从上一个任务开始到下一个任务开始的间隔，单位是毫秒。
     */
    @Scheduled(cron="${tasktime_cron}")
//    @Scheduled(fixedRate=2000) // 每5分钟执行一次   5*60*1000
//    @Scheduled(fixedRate=1000) // 每1s
    public void dual() {
        System.out.println(i++);
    }
}