spring boot 使用 @Scheduled 注解和 TaskScheduler 接口实现定时任务

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

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) {
        SpringApplication.run(Application.class, args);
    }
}

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
@Component
public class ScheduledTask {
    @Scheduled(fixedRate = 5000)
    public void fixedRateTask() {
        System.out.println("Fixed rate task executed at " + LocalDateTime.now());
    }
    @Scheduled(fixedDelay = 5000)
    public void fixedDelayTask() {
        System.out.println("Fixed delay task executed at " + LocalDateTime.now());
    }
    @Scheduled(cron = "0 * * * * ?")
    public void cronTask() {
        System.out.println("Cron task executed at " + LocalDateTime.now());
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import java.time.LocalDateTime;
@Configuration
public class SchedulerConfig {
    @Bean
    public TaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setPoolSize(5);
        return taskScheduler;
    }
    @Bean
    public Runnable exampleTask() {
        return () -> System.out.println("Task executed at " + LocalDateTime.now());
    }
    @Bean
    public ScheduledTaskRegistrar scheduledTaskRegistrar(TaskScheduler taskScheduler, Runnable exampleTask) {
        ScheduledTaskRegistrar taskRegistrar = new ScheduledTaskRegistrar();
        taskRegistrar.setTaskScheduler(taskScheduler);
        taskRegistrar.addFixedRateTask(exampleTask, 5000);
        return taskRegistrar;
    }
}