本指南将指导您完成使用Spring安排任务的步骤。
参考教程：
https://spring.io/guides/gs/scheduling-tasks/
https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#scheduling
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.springframework</groupId>
<artifactId>gs-scheduling-tasks</artifactId>
<version>0.1.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.Date;
@Component
public class ScheduledTasks {
private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
@Scheduled(fixedRate = 1000)
public void reportCurrentTime()
{
System.out.println(dateFormat.format(new Date()));
}
}
@Schedule注释定义特定方法何时运行。注意：此示例使用fixedRate，它指定从每次调用的开始时间开始测量的方法调用之间的间隔。还有其他选项，例如fixedDelay，它指定从完成任务开始测量的调用之间的间隔。您还可以使用@Scheduled（cron =“...”）表达式进行更复杂的任务调度。
如果您需要更为复杂的时间调度，请参考：
https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#scheduling-annotation-support-scheduled
https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/scheduling/support/CronSequenceGenerator.html
http://www.manpagez.com/man/5/crontab/
"0 0 * * * *" = the top of every hour of every day. "*/10 * * * * *" = every ten seconds. "0 0 8-10 * * *" = 8, 9 and 10 o‘clock of every day. "0 0 6,19 * * *" = 6:00 AM and 7:00 PM every day. "0 0/30 8-10 * * *" = 8:00, 8:30, 9:00, 9:30, 10:00 and 10:30 every day. "0 0 9-17 * * MON-FRI" = on the hour nine-to-five weekdays "0 0 0 25 12 ?" = every Christmas Day at midnight
@EnableScheduling确保创建后台任务执行程序。没有它，没有任何安排。
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class);
}
}
在控制台按照规定间隔打印当前时间
原文：https://www.cnblogs.com/MrSaver/p/9266032.html