spring boot--定时任务，线程池执行定时任务，启动成功后运行任务

• spring boot启动成功之后执行代码

1. 写一个类实现ApplicationRunner或CommandLineRunner接口，这两个接口除了传入参数不一样外，其他都一样。
2. 放入spring IOC容器

@Component
public class MyApplicationRunnerDemo implements ApplicationRunner {
    private static final Logger log= LoggerFactory.getLogger(MyApplicationRunnerDemo.class);
    public void run(ApplicationArguments args) throws Exception {
        log.debug("MyApplicationRunnerDemo started.");
    }
}

@Component
public class MyCommandLineRunnerDemo implements CommandLineRunner {
    private static final Logger log= LoggerFactory.getLogger(MyCommandLineRunnerDemo.class);
    public void run(String... args) throws Exception {
        log.debug("MyCommandLineRunnerDemo started.");
    }
}

 

• spring boot执行定时任务

1. 在启动类上 加注解：@EnableScheduling
2. 写一个类，在需要执行的方法上加注解@Scheduled(cron表达式)
3. 放入spring IOC容器

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

@Component
public class MySchedul {
    private static final Logger log= LoggerFactory.getLogger(MySchedul.class);

    @Scheduled(cron = "*/3 * * * * ?")
    public void job1(){
        log.debug("job1 stared");
    }

    @Scheduled(cron = "*/5 * * * * ?")
    public void job2(){
        log.debug("job2 stared");
    }
}

 

• 线程池执行定时任务

1. 配置线程池：@Bean("executor")
2. 在启动类上 加注解：@EnableAsync
3. 在定时任务方法上加注解：@Async("executor")

@Configuration
public class MyExecutor {

    @Bean("executor")
    public Executor executor(){
        ThreadPoolTaskExecutor executor=new ThreadPoolTaskExecutor();
        //核心线程数
        executor.setCorePoolSize(8);
        //最大核心线程数
        executor.setMaxPoolSize(16);
        //队列中等待被调度的任务数
        executor.setQueueCapacity(8);
        //
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());

        return executor;
    }
}

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

@Component
public class MySchedul {
    private static final Logger log= LoggerFactory.getLogger(MySchedul.class);

    @Scheduled(cron = "*/3 * * * * ?")
    @Async("executor")
    public void job1(){
        log.debug("job1 stared");
    }

    @Scheduled(cron = "*/5 * * * * ?")
    @Async("executor")
    public void job2(){
        log.debug("job2 stared");
    }
}

查看输出日志是否为同一个线程，如果不是，则配置成功：