定时任务的实现

<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>com.itheima</groupId>
    <artifactId>chapter091</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

server:
  port: 8088

package com.itheima.service;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

@Service
public class ScheduledTaskService {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private Integer count1 = 1;
    private Integer count2 = 1;
    private Integer count3 = 1;

    @Scheduled(fixedRate = 60000)
    public void scheduledTaskImmediately() {
        System.out.println(String.format("fixedRate第%s次执行，当前时间为：%s", count1++, dateFormat.format(new Date())));
    }

    @Scheduled(fixedDelay = 60000)
    public void scheduledTaskAfterSleep() throws InterruptedException {
        System.out.println(String.format("fixedDelay第%s次执行，当前时间为：%s", count2++, dateFormat.format(new Date())));
        Thread.sleep(10000);
    }

    @Scheduled(cron = "0 * * * * *")
    public void scheduledTaskCron() {
        System.out.println(String.format("cron第%s次执行，当前时间为：%s", count3++, dateFormat.format(new Date())));
    }
}

package com.itheima;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;

@EnableScheduling
@EnableAsync
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}