@Configuration  //標(biāo)記配置類
@EnableScheduling   //開(kāi)啟定時(shí)任務(wù)
public class MyScheduleConfig {

    //添加定時(shí)任務(wù)
    @Scheduled(cron = "0/5 * * * * ?")
    private void myTasks() {
        System.out.println("執(zhí)行定時(shí)任務(wù) " + LocalDateTime.now());
    }
}

CREATE TABLE `scheduled_job` (
  `job_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵id',
  `job_key` varchar(128) NOT NULL COMMENT '定時(shí)任務(wù)完整類名',
  `cron_expression` varchar(20) NOT NULL COMMENT 'cron表達(dá)式',
  `task_explain` varchar(50) NOT NULL DEFAULT '' COMMENT '任務(wù)描述',
  `status` tinyint(4) NOT NULL DEFAULT '1' COMMENT '狀態(tài),1:正常;-1:停用',
  PRIMARY KEY (`job_id`),
  UNIQUE KEY `job_key` (`job_key`),
  UNIQUE KEY `cron_key_unique_idx` (`job_key`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='定時(shí)任務(wù)表';

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
            <scope>runtime</scope>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.1.tmp</version>
        </dependency>
        <!--lombok簡(jiǎn)化代碼-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
            <scope>provided</scope>
        </dependency>

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/test?userUnicode=true&characterEncoding=UTF8&useSSL=false
    username: root
    password: 123
    driver-class-name: com.mysql.jdbc.Driver
server:
  servlet:
    context-path: /demo
  port: 8888

@Configuration
@Slf4j
public class ScheduledConfig {

    @Bean
    public ThreadPoolTaskScheduler threadPoolTaskScheduler() {
        log.info("創(chuàng)建定時(shí)任務(wù)調(diào)度線程池 start");
        ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
        threadPoolTaskScheduler.setPoolSize(20);
        threadPoolTaskScheduler.setThreadNamePrefix("taskExecutor-");
        threadPoolTaskScheduler.setWaitForTasksToCompleteOnShutdown(true);
        threadPoolTaskScheduler.setAwaitTerminationSeconds(60);
        log.info("創(chuàng)建定時(shí)任務(wù)調(diào)度線程池 end");
        return threadPoolTaskScheduler;
    }

}

@Slf4j
@Component
public class ScheduledTaskRunner implements ApplicationRunner {
    @Autowired
    private ScheduledTaskService scheduledTaskService;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        log.info("----初始化定時(shí)任務(wù)開(kāi)始----");
        scheduledTaskService.initTask();
        log.info("----初始化定時(shí)任務(wù)完成----");
    }
}

public interface ScheduledOfTask extends Runnable{

    void execute();

    @Override
    default void run() {
        execute();
    }
}

@Component
@Slf4j
public class TaskJob1 implements ScheduledOfTask{
    @Override
    public void execute() {
        log.info("執(zhí)行任務(wù)1 "+ LocalDateTime.now());
    }
}

@Component
@Slf4j
public class TaskJob2 implements ScheduledOfTask{
    @Override
    public void execute() {
        log.info("執(zhí)行任務(wù)2 "+ LocalDateTime.now());
    }
}

public interface ScheduledTaskService{

    Boolean start(ScheduledJob scheduledJob);

    Boolean stop(String jobKey);

    Boolean restart(ScheduledJob scheduledJob);

    void initTask();
}

@Slf4j
@Service
public class ScheduledTaskServiceImpl implements ScheduledTaskService {

    /**
     * 可重入鎖
     */
    private ReentrantLock lock = new ReentrantLock();

    /**
     * 定時(shí)任務(wù)線程池
     */
    @Autowired
    private ThreadPoolTaskScheduler threadPoolTaskScheduler;

    /**
     * 啟動(dòng)狀態(tài)的定時(shí)任務(wù)集合
     */
    public Map<String, ScheduledFuture> scheduledFutureMap = new ConcurrentHashMap<>();

    @Autowired
    private ScheduledJobService scheduledJobService;

    @Override
    public Boolean start(ScheduledJob scheduledJob) {
        String jobKey = scheduledJob.getJobKey();
        log.info("啟動(dòng)定時(shí)任務(wù)"+jobKey);
        //添加鎖放一個(gè)線程啟動(dòng)，防止多人啟動(dòng)多次
        lock.lock();
        log.info("加鎖完成");

        try {
            if(this.isStart(jobKey)){
                log.info("當(dāng)前任務(wù)在啟動(dòng)狀態(tài)中");
                return false;
            }
            //任務(wù)啟動(dòng)
            this.doStartTask(scheduledJob);
        } finally {
            lock.unlock();
            log.info("解鎖完畢");
        }

        return true;
    }

    /**
     * 任務(wù)是否已經(jīng)啟動(dòng)
     */
    private Boolean isStart(String taskKey) {
        //校驗(yàn)是否已經(jīng)啟動(dòng)
        if (scheduledFutureMap.containsKey(taskKey)) {
            if (!scheduledFutureMap.get(taskKey).isCancelled()) {
                return true;
            }
        }
        return false;
    }

    @Override
    public Boolean stop(String jobKey) {
        log.info("停止任務(wù) "+jobKey);
        boolean flag = scheduledFutureMap.containsKey(jobKey);
        log.info("當(dāng)前實(shí)例是否存在 "+flag);
        if(flag){
            ScheduledFuture scheduledFuture = scheduledFutureMap.get(jobKey);

            scheduledFuture.cancel(true);

            scheduledFutureMap.remove(jobKey);
        }
        return flag;
    }

    @Override
    public Boolean restart(ScheduledJob scheduledJob) {
        log.info("重啟定時(shí)任務(wù)"+scheduledJob.getJobKey());
        //停止
        this.stop(scheduledJob.getJobKey());

        return this.start(scheduledJob);
    }

    /**
     * 執(zhí)行啟動(dòng)任務(wù)
     */
    public void doStartTask(ScheduledJob sj){
        log.info(sj.getJobKey());
        if(sj.getStatus().intValue() != 1)
            return;
        Class<?> clazz;
        ScheduledOfTask task;
        try {
            clazz = Class.forName(sj.getJobKey());
            task = (ScheduledOfTask) SpringContextUtil.getBean(clazz);
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("spring_scheduled_cron表數(shù)據(jù)" + sj.getJobKey() + "有誤", e);
        }
        Assert.isAssignable(ScheduledOfTask.class, task.getClass(), "定時(shí)任務(wù)類必須實(shí)現(xiàn)ScheduledOfTask接口");
        ScheduledFuture scheduledFuture = threadPoolTaskScheduler.schedule(task,(triggerContext -> new CronTrigger(sj.getCronExpression()).nextExecutionTime(triggerContext)));
        scheduledFutureMap.put(sj.getJobKey(),scheduledFuture);
    }

    @Override
    public void initTask() {
        List<ScheduledJob> list = scheduledJobService.list();
        for (ScheduledJob sj : list) {
            if(sj.getStatus().intValue() == -1) //未啟用
                continue;
            doStartTask(sj);
        }
    }
}

@Component
public class SpringContextUtil implements ApplicationContextAware {


    private static ApplicationContext applicationContext = null;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringContextUtil.applicationContext == null){
            SpringContextUtil.applicationContext  = applicationContext;
        }
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }
}

@Data
@TableName("scheduled_job")
public class ScheduledJob {

    @TableId(value = "job_id",type = IdType.AUTO)
    private Integer jobId;

    private String jobKey;

    private String cronExpression;

    private String taskExplain;

    private Integer status;

}

public interface ScheduledJobMapper extends BaseMapper<ScheduledJob> {
}

public interface ScheduledJobService extends IService<ScheduledJob> {

    /**
     * 修改定時(shí)任務(wù)，并重新啟動(dòng)
     * @param scheduledJob
     * @return
     */
    boolean updateOne(ScheduledJob scheduledJob);
}

@Service
@Slf4j
public class ScheduledJobServiceImpl extends ServiceImpl<ScheduledJobMapper, ScheduledJob> implements ScheduledJobService{

    @Autowired
    private ScheduledTaskService scheduledTaskService;

    @Override
    public boolean updateOne(ScheduledJob scheduledJob) {
        if(updateById(scheduledJob))
            scheduledTaskService.restart(getById(scheduledJob.getJobId()));
        return true;
    }
}

@RestController
@RequestMapping("/job")
public class ScheduledJobController {

    @Autowired
    private ScheduledJobService scheduledJobService;

    @PostMapping(value = "/update")
    public CallBackResult update(HttpServletRequest request, ScheduledJob scheduledJob){
         if(scheduledJobService.updateOne(scheduledJob))
             return new CallBackResult(true,"修改成功");
         return new CallBackResult(false,"修改失敗");
    }

}