在spring boot項(xiàng)目中，可以通過@EnableScheduling注解和@Scheduled注解實(shí)現(xiàn)定時(shí)任務(wù)，也可以通過SchedulingConfigurer接口來實(shí)現(xiàn)定時(shí)任務(wù)。但是這兩種方式不能動(dòng)態(tài)添加吼和、刪除、啟動(dòng)、停止任務(wù)影兽。

要實(shí)現(xiàn)動(dòng)態(tài)增刪啟停定時(shí)任務(wù)功能，比較廣泛的做法是集成Quartz框架莱革。但是本人的開發(fā)原則是：在滿足項(xiàng)目需求的情況下峻堰，盡量少的依賴其它框架，避免項(xiàng)目過于臃腫和復(fù)雜驮吱。

查看spring-context這個(gè)jar包中org.springframework.scheduling.ScheduledTaskRegistrar這個(gè)類的源代碼茧妒，發(fā)現(xiàn)可以通過改造這個(gè)類就能實(shí)現(xiàn)動(dòng)態(tài)增刪啟停定時(shí)任務(wù)功能。

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定時(shí)任務(wù)列表頁

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定時(shí)任務(wù)執(zhí)行日志添加執(zhí)行定時(shí)任務(wù)的線程池配置類

@Configuration  
public class SchedulingConfig {  
    @Bean  
    public TaskScheduler taskScheduler() {  
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();  
        // 定時(shí)任務(wù)執(zhí)行線程池核心線程數(shù)  
        taskScheduler.setPoolSize(4);  
        taskScheduler.setRemoveOnCancelPolicy(true);  
        taskScheduler.setThreadNamePrefix("TaskSchedulerThreadPool-");  
        return taskScheduler;  
    }  
}  

添加ScheduledFuture的包裝類左冬。ScheduledFuture是ScheduledExecutorService定時(shí)任務(wù)線程池的執(zhí)行結(jié)果桐筏。

public final class ScheduledTask {  
    volatile ScheduledFuture<?> future;  
     /**  
     * 取消定時(shí)任務(wù)  
     */  
    public void cancel() {  
        ScheduledFuture<?> future = this.future;  
        if (future != null) {  
            future.cancel(true);  
        }  
    }  
}  

添加Runnable接口實(shí)現(xiàn)類，被定時(shí)任務(wù)線程池調(diào)用拇砰，用來執(zhí)行指定bean里面的方法梅忌。

public class SchedulingRunnable implements Runnable {  

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

    private String beanName;  

    private String methodName;  

    private String params;  

    public SchedulingRunnable(String beanName, String methodName) {  
        this(beanName, methodName, null);  
    }  

    public SchedulingRunnable(String beanName, String methodName, String params) {  
        this.beanName = beanName;  
        this.methodName = methodName;  
        this.params = params;  
    }  

    @Override  
    public void run() {  
        logger.info("定時(shí)任務(wù)開始執(zhí)行 - bean：{}，方法：{}除破，參數(shù)：{}", beanName, methodName, params);  
        long startTime = System.currentTimeMillis();  

        try {  
            Object target = SpringContextUtils.getBean(beanName);  

            Method method = null;  
            if (StringUtils.isNotEmpty(params)) {  
                method = target.getClass().getDeclaredMethod(methodName, String.class);  
            } else {  
                method = target.getClass().getDeclaredMethod(methodName);  
            }  

            ReflectionUtils.makeAccessible(method);  
            if (StringUtils.isNotEmpty(params)) {  
                method.invoke(target, params);  
            } else {  
                method.invoke(target);  
            }  
        } catch (Exception ex) {  
            logger.error(String.format("定時(shí)任務(wù)執(zhí)行異常 - bean：%s牧氮，方法：%s，參數(shù)：%s ", beanName, methodName, params), ex);  
        }  

        long times = System.currentTimeMillis() - startTime;  
        logger.info("定時(shí)任務(wù)執(zhí)行結(jié)束 - bean：{}瑰枫，方法：{}踱葛，參數(shù)：{}丹莲，耗時(shí)：{} 毫秒", beanName, methodName, params, times);  
    }  

    @Override  
    public boolean equals(Object o) {  
        if (this == o) return true;  
        if (o == null || getClass() != o.getClass()) return false;  
        SchedulingRunnable that = (SchedulingRunnable) o;  
        if (params == null) {  
            return beanName.equals(that.beanName) &&  
                    methodName.equals(that.methodName) &&  
                    that.params == null;  
        }  

        return beanName.equals(that.beanName) &&  
                methodName.equals(that.methodName) &&  
                params.equals(that.params);  
    }  

    @Override  
    public int hashCode() {  
        if (params == null) {  
            return Objects.hash(beanName, methodName);  
        }  

        return Objects.hash(beanName, methodName, params);  
    }  
}  

添加定時(shí)任務(wù)注冊(cè)類，用來增加尸诽、刪除定時(shí)任務(wù)甥材。

@Component  
public class CronTaskRegistrar implements DisposableBean {  

    private final Map<Runnable, ScheduledTask> scheduledTasks = new ConcurrentHashMap<>(16);  

    @Autowired  
    private TaskScheduler taskScheduler;  

    public TaskScheduler getScheduler() {  
        return this.taskScheduler;  
    }  

    public void addCronTask(Runnable task, String cronExpression) {  
        addCronTask(new CronTask(task, cronExpression));  
    }  

    public void addCronTask(CronTask cronTask) {  
        if (cronTask != null) {  
            Runnable task = cronTask.getRunnable();  
            if (this.scheduledTasks.containsKey(task)) {  
                removeCronTask(task);  
            }  

            this.scheduledTasks.put(task, scheduleCronTask(cronTask));  
        }  
    }  

    public void removeCronTask(Runnable task) {  
        ScheduledTask scheduledTask = this.scheduledTasks.remove(task);  
        if (scheduledTask != null)  
            scheduledTask.cancel();  
    }  

    public ScheduledTask scheduleCronTask(CronTask cronTask) {  
        ScheduledTask scheduledTask = new ScheduledTask();  
        scheduledTask.future = this.taskScheduler.schedule(cronTask.getRunnable(), cronTask.getTrigger());  

        return scheduledTask;  
    }  

    @Override  
    public void destroy() {  
        for (ScheduledTask task : this.scheduledTasks.values()) {  
            task.cancel();  
        }  

        this.scheduledTasks.clear();  
    }  
}  

添加定時(shí)任務(wù)示例類

@Component("demoTask")  
public class DemoTask {  
    public void taskWithParams(String params) {  
        System.out.println("執(zhí)行有參示例任務(wù)：" + params);  
    }  

    public void taskNoParams() {  
        System.out.println("執(zhí)行無參示例任務(wù)");  
    }  
}  

定時(shí)任務(wù)數(shù)據(jù)庫表設(shè)計(jì)

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定時(shí)任務(wù)數(shù)據(jù)庫表設(shè)計(jì)添加定時(shí)任務(wù)實(shí)體類

public class SysJobPO {  
    /**  
     * 任務(wù)ID  
     */  
    private Integer jobId;  
    /**  
     * bean名稱  
     */  
    private String beanName;  
    /**  
     * 方法名稱  
     */  
    private String methodName;  
    /**  
     * 方法參數(shù)  
     */  
    private String methodParams;  
    /**  
     * cron表達(dá)式  
     */  
    private String cronExpression;  
    /**  
     * 狀態(tài)（1正常 0暫停）  
     */  
    private Integer jobStatus;  
    /**  
     * 備注  
     */  
    private String remark;  
    /**  
     * 創(chuàng)建時(shí)間  
     */  
    private Date createTime;  
    /**  
     * 更新時(shí)間  
     */  
    private Date updateTime;  

    public Integer getJobId() {  
        return jobId;  
    }  

    public void setJobId(Integer jobId) {  
        this.jobId = jobId;  
    }  

    public String getBeanName() {  
        return beanName;  
    }  

    public void setBeanName(String beanName) {  
        this.beanName = beanName;  
    }  

    public String getMethodName() {  
        return methodName;  
    }  

    public void setMethodName(String methodName) {  
        this.methodName = methodName;  
    }  

    public String getMethodParams() {  
        return methodParams;  
    }  

    public void setMethodParams(String methodParams) {  
        this.methodParams = methodParams;  
    }  

    public String getCronExpression() {  
        return cronExpression;  
    }  

    public void setCronExpression(String cronExpression) {  
        this.cronExpression = cronExpression;  
    }  

    public Integer getJobStatus() {  
        return jobStatus;  
    }  

    public void setJobStatus(Integer jobStatus) {  
        this.jobStatus = jobStatus;  
    }  

    public String getRemark() {  
        return remark;  
    }  

    public void setRemark(String remark) {  
        this.remark = remark;  
    }  

    public Date getCreateTime() {  
        return createTime;  
    }  

    public void setCreateTime(Date createTime) {  
        this.createTime = createTime;  
    }  

    public Date getUpdateTime() {  
        return updateTime;  
    }  

    public void setUpdateTime(Date updateTime) {  
        this.updateTime = updateTime;  
    }  

}  

新增定時(shí)任務(wù)

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新增定時(shí)任務(wù)

boolean success = sysJobRepository.addSysJob(sysJob);  
if (!success)  
    return OperationResUtils.fail("新增失敗");  
else {  
    if (sysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {  
        SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams());  
        cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression());  
    }  
}  

return OperationResUtils.success();  

修改定時(shí)任務(wù)，先移除原來的任務(wù)性含，再啟動(dòng)新任務(wù)

boolean success = sysJobRepository.editSysJob(sysJob);  
if (!success)  
    return OperationResUtils.fail("編輯失敗");  
else {  
    //先移除再添加  
    if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {  
        SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());  
        cronTaskRegistrar.removeCronTask(task);  
    }  

    if (sysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {  
        SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams());  
        cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression());  
    }  
}  

return OperationResUtils.success();  

刪除定時(shí)任務(wù)

boolean success = sysJobRepository.deleteSysJobById(req.getJobId());  
if (!success)  
    return OperationResUtils.fail("刪除失敗");  
else{  
    if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {  
        SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());  
        cronTaskRegistrar.removeCronTask(task);  
    }  
}  

return OperationResUtils.success();  

定時(shí)任務(wù)啟動(dòng)/停止?fàn)顟B(tài)切換

if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {  
    SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());  
    cronTaskRegistrar.addCronTask(task, existedSysJob.getCronExpression());  
} else {  
    SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());  
    cronTaskRegistrar.removeCronTask(task);  
}  

添加實(shí)現(xiàn)了CommandLineRunner接口的SysJobRunner類洲赵，當(dāng)spring boot項(xiàng)目啟動(dòng)完成后，加載數(shù)據(jù)庫里狀態(tài)為正常的定時(shí)任務(wù)商蕴。

@Service  
public class SysJobRunner implements CommandLineRunner {  

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

    @Autowired  
    private ISysJobRepository sysJobRepository;  

    @Autowired  
    private CronTaskRegistrar cronTaskRegistrar;  

    @Override  
    public void run(String... args) {  
        // 初始加載數(shù)據(jù)庫里狀態(tài)為正常的定時(shí)任務(wù)  
        List<SysJobPO> jobList = sysJobRepository.getSysJobListByStatus(SysJobStatus.NORMAL.ordinal());  
        if (CollectionUtils.isNotEmpty(jobList)) {  
            for (SysJobPO job : jobList) {  
                SchedulingRunnable task = new SchedulingRunnable(job.getBeanName(), job.getMethodName(), job.getMethodParams());  
                cronTaskRegistrar.addCronTask(task, job.getCronExpression());  
            }  

            logger.info("定時(shí)任務(wù)已加載完畢...");  
        }  
    }  
}  

工具類SpringContextUtils叠萍，用來從spring容器里獲取bean

@Component  
public class SpringContextUtils implements ApplicationContextAware {  

    private static ApplicationContext applicationContext;  

    @Override  
    public void setApplicationContext(ApplicationContext applicationContext)  
            throws BeansException {  
        SpringContextUtils.applicationContext = applicationContext;  
    }  

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

    public static <T> T getBean(Class<T> requiredType) {  
        return applicationContext.getBean(requiredType);  
    }  

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

    public static boolean containsBean(String name) {  
        return applicationContext.containsBean(name);  
    }  

    public static boolean isSingleton(String name) {  
        return applicationContext.isSingleton(name);  
    }  

    public static Class<? extends Object> getType(String name) {  
        return applicationContext.getType(name);  
    }  
}

至此完畢！