动态控制定时任务增删启停

1.启动类增加注解

Application启动类上添加注解@EnableScheduling

2.创建 DynamicScheduledTaskRegistrar 核心类

java 复制代码

@Slf4j
public class DynamicScheduledTaskRegistrar extends ScheduledTaskRegistrar {
    private final Map<String, ScheduledTask> scheduledTaskMap = new LinkedHashMap<>(16);

    public DynamicScheduledTaskRegistrar(){
        super();
        // 两种实现方案
        //ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(10);
        //TaskScheduler taskScheduler = new ConcurrentTaskScheduler(scheduledExecutorService);
        // 第二种实现方案
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setPoolSize(8);
        taskScheduler.setRemoveOnCancelPolicy(true);
        taskScheduler.setThreadNamePrefix("dynamic-scheduled-task-");
        taskScheduler.initialize();
        this.setScheduler(taskScheduler);
    }
    /**
     * 新增任务
     * @param taskName
     * @param cron
     * @param runnable
     */
    public Boolean addCronTask(String taskName,String cron,Runnable runnable){
        if(scheduledTaskMap.containsKey(taskName)){
            log.error("定时任务["+ taskName+"]已存在，添加失败");
            return Boolean.FALSE;
        }
        CronTask cronTask = new CronTask(runnable,cron);
        ScheduledTask scheduledTask = this.scheduleCronTask(cronTask);
        scheduledTaskMap.put(taskName,scheduledTask);
        log.info("定时任务["+taskName+"]新增成功");
        return Boolean.TRUE;
    }

    /**
     * 删除任务
     * @param taskName
     */
    public void cancelCronTask(String taskName){
        ScheduledTask scheduledTask = scheduledTaskMap.get(taskName);
        if(null != scheduledTask){
            scheduledTask.cancel();
            scheduledTaskMap.remove(taskName);
        }
        log.info("定时任务["+taskName+"]删除成功");
    }

    @Override
    public void destroy() {
        super.destroy();
        scheduledTaskMap.values().forEach(ScheduledTask::cancel);
    }
}

测试请求

java 复制代码

@Controller
@RequestMapping("/task/")
public class TaskController {
    @Resource
    public DynamicScheduledTaskRegistrar dynamicScheduledTaskRegistrar;

    @RequestMapping("test")
    @ResponseBody
    public String testTask(){
        String cron ="0/5 * * * * ?";
        String taskName = "test";
        Runnable runnable = this::test;
        dynamicScheduledTaskRegistrar.addCronTask(taskName,cron,runnable);
        return "true";
    }

    public void test(){
        System.out.println("aaa");
    }
}