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本篇內(nèi)容介紹了“在springboot中使用定時(shí)任務(wù)的方式”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
在springboot環(huán)境下有多種方法,這里記錄下使用過(guò)的其中兩種;1、使用注解,2、通過(guò)實(shí)現(xiàn)接口的方式。
使用注解的方式雖然比較簡(jiǎn)單,但是如果項(xiàng)目需要用戶(hù)對(duì)定時(shí)周期進(jìn)行修改操作,只使用注解就比較難實(shí)現(xiàn)。所以可以使用實(shí)現(xiàn)接口的方式。通過(guò)對(duì)接口的實(shí)現(xiàn),可以在項(xiàng)目運(yùn)行時(shí)根據(jù)需要修改任務(wù)執(zhí)行周期,只需要關(guān)閉原任務(wù)再開(kāi)啟新任務(wù)即可。
首先需要在啟動(dòng)類(lèi)下添加 @EnableScheduling 注解(@EnableAsync是開(kāi)啟異步的注解)
package com.fongtech.cli; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.annotation.EnableScheduling; @SpringBootApplication @MapperScan("com.fongtech.cli.mbg.*.**") @EnableAsync @EnableScheduling public class SpringbootAdminApplication { public static void main(String[] args) { SpringApplication.run(SpringbootAdminApplication.class, args); } }
接著在需要用到定時(shí)任務(wù)的類(lèi)和方法下加 @Component 和 @Scheduled(cron = "0 0/1 * * * ? ")注解,其中@Scheduled()中的 ‘cron' 有固定的格式。(@Async注解表示開(kāi)啟異步)
@Slf4j @Component public class AsyncTaskConfiguration { /** * 每分鐘檢查任務(wù)列表,判斷任務(wù)類(lèi)型執(zhí)行相應(yīng)的任務(wù) * 根據(jù)實(shí)際任務(wù)執(zhí)行情況,限定執(zhí)行任務(wù)數(shù)量 */ @Scheduled(cron = "0 0/1 * * * ? ") @Async public void startCommonTask() throws Exception { log.info("startCommonTask start........." + Thread.currentThread().getName()); commonTaskService.startCommonTask(); log.info("startCommonTask end........." + Thread.currentThread().getName()); }}
通過(guò)實(shí)現(xiàn) SchedulingConfigurer 接口,可對(duì)定時(shí)任務(wù)進(jìn)行操作。實(shí)現(xiàn)接口的方式相比使用注解更加靈活,但需要編寫(xiě)代碼,相對(duì)繁瑣。
實(shí)現(xiàn)工具類(lèi)如下:
package com.fongtech.cli.admin.tasktime; import com.fongtech.cli.common.util.BeanUtils; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.SchedulingException; import org.springframework.scheduling.TaskScheduler; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.SchedulingConfigurer; import org.springframework.scheduling.config.ScheduledTaskRegistrar; import org.springframework.scheduling.config.TriggerTask; import org.springframework.scheduling.support.CronTrigger; import javax.annotation.PostConstruct; import java.util.Map; import java.util.Set; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ScheduledFuture; /** * @author linb * @date 2020/6/15 11:16 */ @Configuration //@EnableScheduling public class DefaultSchedulingConfigurer implements SchedulingConfigurer { private ScheduledTaskRegistrar taskRegistrar; private Set<ScheduledFuture<?>> scheduledFutures = null; private Map<String, ScheduledFuture<?>> taskFutures = new ConcurrentHashMap<>(); @Override public void configureTasks(ScheduledTaskRegistrar taskRegistrar) { this.taskRegistrar = taskRegistrar; } @SuppressWarnings("unchecked") private Set<ScheduledFuture<?>> getScheduledFutures() { if (scheduledFutures == null) { try { // spring版本不同選用不同字段scheduledFutures scheduledFutures = (Set<ScheduledFuture<?>>) BeanUtils.getProperty(taskRegistrar, "scheduledTasks"); } catch (NoSuchFieldException e) { throw new SchedulingException("not found scheduledFutures field."); } } return scheduledFutures; } /** * 添加任務(wù) */ public void addTriggerTask(String taskId, TriggerTask triggerTask) { if (taskFutures.containsKey(taskId)) { throw new SchedulingException("the taskId[" + taskId + "] was added."); } TaskScheduler scheduler = taskRegistrar.getScheduler(); ScheduledFuture<?> future = scheduler.schedule(triggerTask.getRunnable(), triggerTask.getTrigger()); getScheduledFutures().add(future); taskFutures.put(taskId, future); } /** * 取消任務(wù) */ public void cancelTriggerTask(String taskId) { ScheduledFuture<?> future = taskFutures.get(taskId); if (future != null) { future.cancel(true); } taskFutures.remove(taskId); getScheduledFutures().remove(future); } /** * 重置任務(wù) */ public void resetTriggerTask(String taskId, TriggerTask triggerTask) { cancelTriggerTask(taskId); addTriggerTask(taskId, triggerTask); } /** * 任務(wù)編號(hào) */ public Set<String> taskIds() { return taskFutures.keySet(); } /** * 是否存在任務(wù) */ public boolean hasTask(String taskId) { return this.taskFutures.containsKey(taskId); } /** * 任務(wù)調(diào)度是否已經(jīng)初始化完成 */ public boolean inited() { return this.taskRegistrar != null && this.taskRegistrar.getScheduler() != null; } }
在項(xiàng)目啟動(dòng)后就自動(dòng)開(kāi)啟任務(wù)的操作類(lèi)如下:
package com.fongtech.cli.admin.tasktime; import com.fongtech.cli.admin.service.IAuthLoginService; import com.fongtech.cli.admin.service.IBackupsService; import com.fongtech.cli.admin.service.IDictionnaryEntryService; import com.fongtech.cli.mbg.model.entity.AuthLogin; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.CommandLineRunner; import org.springframework.core.annotation.Order; import org.springframework.scheduling.config.TriggerTask; import org.springframework.scheduling.support.CronTrigger; import org.springframework.stereotype.Component; /** * 項(xiàng)目啟動(dòng)后執(zhí)行, */ @Slf4j @Component @Order(value = 1) public class CmdRunner implements CommandLineRunner { @Autowired private DefaultSchedulingConfigurer defaultSchedulingConfigurer; @Autowired private IDictionnaryEntryService dictionnaryEntryService; @Autowired private IBackupsService backupsService; @Autowired private IAuthLoginService authLoginService; @Override public void run(String... args) throws Exception { log.info("------按照預(yù)設(shè)備份周期啟動(dòng)數(shù)據(jù)庫(kù)備份定時(shí)任務(wù)"); while (!defaultSchedulingConfigurer.inited()) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } finally { } } String cron = dictionnaryEntryService.getEntryValueByName("CRON_VALUE"); //默認(rèn)按照管理員用戶(hù)權(quán)限執(zhí)行備份任務(wù) AuthLogin authLogin = authLoginService.query().eq(AuthLogin::getLogin_user, "admin").getOne(); //啟動(dòng)線程,按照原表內(nèi)的時(shí)間執(zhí)行備份任務(wù) defaultSchedulingConfigurer.addTriggerTask("task", new TriggerTask( () -> System.out.println("=====----------啟動(dòng)定時(shí)任務(wù)=-----------");, new CronTrigger(cron))); } }
暫停定時(shí)任務(wù):
defaultSchedulingConfigurer.cancelTriggerTask("task");
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