启动时自动运行：

（1）实现CommandLineRunner接口；

（2）重写run()方法

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@Slf4j
public class Runner implements CommandLineRunner {

    @Override
    public void run(String... args) throws Exception {
        log.info("初始化run.........执行开始");
        initResource();
        log.info("初始化run.........执行结束");

    }

    private void initResource(){
        int sum = 0;
        for (int i = 0; i <= 100; i++) {
            sum += i;
        }
        log.info("结果为{}",sum);
    }

}

 

 如果有多个类实现了CommandLineRunner接口，需要指定其执行的顺序。采用@Order(value = 数值)来指定执行的顺序。其中数值越小越先执行。

当前两个类都实现了该接口

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@Slf4j
@Order(value = 1)
public class Runner implements CommandLineRunner {

    @Override
    public void run(String... args) throws Exception {
        log.info("初始化run.........执行开始");
        initResource();
        log.info("初始化run.........执行结束");

    }
    private void initResource(){
        int sum = 0;
        for (int i = 0; i <= 100; i++) {
            sum += i;
        }
        log.info("结果为{}",sum);
    }

}

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Slf4j
@Order(value = 2)
public class Runner_01 implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        log.info(" Runner_01类代码.........执行开始");
    }
}

 

 定时执行任务：

（1）在启动类开启定时任务@EnableScheduling

@SpringBootApplication
//开启定时任务
@EnableScheduling
public class DemoApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext run = SpringApplication.run(DemoApplication.class, args);
    }

}

（2）@Scheduled(cron = " ")来指定自动执行规则

    /**
     * 每分钟执行一次
     */
    @Scheduled(cron = "0 0/1 * * * ?")
    public void initResourcePool() {
        log.info("定时任务initResourcePool.........执行开始");
        initResource();
        log.info("定时任务initResourcePool.........执行结束");
    }