springboot 定时任务@Scheduled实现解析

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.1.RELEASE</version>
  </parent>

  <dependencies>
    <!-- SpringBoot 核心组件 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
  </dependencies>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.scheduling.annotation.EnableScheduling;
@ComponentScan(basePackages = { "com.xwj.tasks" })
@EnableScheduling // 开启定时任务
@EnableAutoConfiguration
public class App {
  public static void main(String[] args) {
    SpringApplication.run(App.class, args);
  }
}

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class ScheduleTask {
  @Scheduled(fixedRate = 1000)
  // @Scheduled(cron = "0 23-25 18 * * ?")
  public void testSchedule() {
    System.out.println("定时任务：" + System.currentTimeMillis());
  }
}