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1. 定時(shí)任務(wù)實(shí)現(xiàn)方式
定時(shí)任務(wù)實(shí)現(xiàn)方式:
定時(shí)任務(wù)執(zhí)行方式:
2. 創(chuàng)建定時(shí)任務(wù)
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() { // 間隔2分鐘,執(zhí)行任務(wù) Thread current = Thread.currentThread(); System.out.println("定時(shí)任務(wù)1:"+current.getId()); logger.info("ScheduledTest.executeFileDownLoadTask 定時(shí)任務(wù)1:"+current.getId()+ ",name:"+current.getName()); } }
@Scheduled 注解用于標(biāo)注這個(gè)方法是一個(gè)定時(shí)任務(wù)的方法,有多種配置可選。cron支持cron表達(dá)式,指定任務(wù)在特定時(shí)間執(zhí)行;fixedRate以特定頻率執(zhí)行任務(wù);fixedRateString以string的形式配置執(zhí)行頻率。
3. 啟動(dòng)定時(shí)任務(wù)
@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 注解的作用是發(fā)現(xiàn)注解@Scheduled的任務(wù)并后臺(tái)執(zhí)行。
Springboot本身默認(rèn)的執(zhí)行方式是串行執(zhí)行,也就是說無論有多少task,都是一個(gè)線程串行執(zhí)行,并行需手動(dòng)配置
4. 并行任務(wù)
繼承SchedulingConfigurer類并重寫其方法即可,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); } }
再次執(zhí)行之前的那個(gè)Demo,會(huì)欣然發(fā)現(xiàn)已經(jīng)是并行執(zhí)行了!
5. 異步并行任務(wù)
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; @Configuration @EnableScheduling @EnableAsync( mode = AdviceMode.PROXY, proxyTargetClass = false, order = Ordered.HIGHEST_PRECEDENCE ) @ComponentScan( basePackages = "hello" ) 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); } }
在啟動(dòng)的main方法加入額外配置:
@SpringBootApplication public class Application { public static void main(String[] args) throws Exception { AnnotationConfigApplicationContext rootContext = new AnnotationConfigApplicationContext(); rootContext.register(RootContextConfiguration.class); rootContext.refresh(); } }
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