SpringBoot Schedule 配置

1、定时任务实现方式：

SpringBoot自带的Scheduled，可以将它看成一个轻量级的Quartz，而且使用起来比Quartz简单许多，本文主要介绍。
定时任务执行方式：

单线程（串行）
多线程（并行）

2、 创建定时任务

package com.autonavi.task.test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import com.autonavi.task.ScheduledTasks;

@Component
public class ScheduledTest {

    private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);

    @Scheduled(cron="0 0/2 * * * ?")
    public void executeFileDownLoadTask() {

        // 间隔2分钟,执行任务    
        Thread current = Thread.currentThread(); 
        System.out.println("定时任务1:"+current.getId());
        logger.info("ScheduledTest.executeFileDownLoadTask 定时任务1:"+current.getId()+ ",name:"+current.getName());
    }
}

@Scheduled 注解用于标注这个方法是一个定时任务的方法，有多种配置可选。
cron支持cron表达式，指定任务在特定时间执行；
fixedRate以特定频率执行任务；fixedRateString以string的形式配置执行频率。

3、启动定时任务

@SpringBootApplication
@EnableScheduling
public class App {

    private static final Logger logger = LoggerFactory.getLogger(App.class);

    public static void main(String[] args) {

        SpringApplication.run(App.class, args);    
        logger.info("start");                       
    }  
}

其中 @EnableScheduling 注解的作用是发现注解@Scheduled的任务并后台执行。

Springboot本身默认的执行方式是串行执行，也就是说无论有多少task，都是一个线程串行执行，并行需手动配置

4. 并行任务
继承SchedulingConfigurer类并重写其方法即可，如下：

@Configuration
@EnableScheduling
public class ScheduleConfig implements SchedulingConfigurer {

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.setScheduler(taskExecutor());
    }

    @Bean(destroyMethod="shutdown")
    public Executor taskExecutor() {
        return Executors.newScheduledThreadPool(100);
    }
}

4. 异步并行任务
继承SchedulingConfigurer类并重写其方法即可，如下：

package com.oyb.springbootmybatis.Schedule;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.AdviceMode;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

/**
 *
 */
@Configuration
@EnableScheduling
@EnableAsync(
        mode = AdviceMode.PROXY, proxyTargetClass = false,
        order = Ordered.HIGHEST_PRECEDENCE
)
@ComponentScan(
        basePackages = "com.oyb.springbootmybatis.Schedule"
)
public class RootContextConfiguration implements AsyncConfigurer,SchedulingConfigurer {


    @Bean
    public ThreadPoolTaskScheduler taskScheduler()
    {
        ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
        scheduler.setPoolSize(20);
        scheduler.setThreadNamePrefix("task-");
        scheduler.setAwaitTerminationSeconds(60);
        scheduler.setWaitForTasksToCompleteOnShutdown(true);
        return scheduler;
    }

    @Override
    public Executor getAsyncExecutor()
    {
        Executor executor = this.taskScheduler();
        return executor;
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar registrar)
    {
        TaskScheduler scheduler = this.taskScheduler();
        registrar.setTaskScheduler(scheduler);
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return null;
    }
}

在启动的main方法加入额外配置：

@SpringBootApplication
public class Application {

    public static void main(String[] args) throws Exception {


     AnnotationConfigApplicationContext rootContext =
     new AnnotationConfigApplicationContext();

    rootContext.register(RootContextConfiguration.class);
    rootContext.refresh();
    }
}

转载:https://www.cnblogs.com/slimer/p/6222485.html