本文定时任务功能(增、删、改、启动、暂停) 话不多说,直接上代码,你们直接CV就可以用!!!

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
@Configuration
public class SchedulingConfig {  
    @Bean
    public TaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        // 定时任务执行线程池核心线程数  
        taskScheduler.setPoolSize(6);  
        taskScheduler.setRemoveOnCancelPolicy(true);  
        taskScheduler.setThreadNamePrefix("TaskSchedulerThreadPool-");  
        return taskScheduler;  
    }  
}   
ScheduledFuture是ScheduledExecutorService定时任务线程池的执行结果。
import java.util.concurrent.ScheduledFuture;
public final class ScheduledTask {
  
    volatile ScheduledFuture> future;
    /**  
     * 取消定时任务  
     */  
    public void cancel() {  
        ScheduledFuture> future = this.future;  
        if (future != null) {  
            future.cancel(true);  
        }  
    }  
} 
被定时任务线程池调用,用来执行指定bean里面的方法。
import com.ying.demo.utils.springContextUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
import java.lang.reflect.Method;
import java.util.Objects;
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("定时任务开始执行 - bean:{},方法:{},参数:{}", beanName, methodName, params);
      long startTime = System.currentTimeMillis();
      try {
         Object target = springContextUtils.getBean(beanName);
         Method method = null;
         if (!StringUtils.isEmpty(params)) {
            method = target.getClass().getDeclaredMethod(methodName, String.class);
         } else {
            method = target.getClass().getDeclaredMethod(methodName);
         }
         ReflectionUtils.makeAccessible(method);
         if (!StringUtils.isEmpty(params)) {
            method.invoke(target, params);
         } else {
            method.invoke(target);
         }
      } catch (Exception ex) {
         logger.error(String.format("定时任务执行异常 - bean:%s,方法:%s,参数:%s ", beanName, methodName, params), ex);
      }
      long times = System.currentTimeMillis() - startTime;
      logger.info("定时任务执行结束 - bean:{},方法:{},参数:{},耗时:{} 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);
   }
}   
用来增加、删除定时任务
@Component
public class CronTaskRegistrar implements DisposableBean {
   private final Map 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();
   }
}    
@Slf4j
@Component("taskDemo")
public class Task1 {  
    public void taskByParams(String params) {
        log.info("taskByParams执行时间:{}", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        log.info("taskByParams执行有参示例任务:{}",params);
    }  
  
    public void taskNoParams() {
        log.info("taskByParams执行时间:{}", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        log.info("taskNoParams执行无参示例任务");
    }
    public void test(String params) {
        log.info("test执行时间:{}", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        log.info("test执行有参示例任务:{}",params);
    }
}  
CREATE TABLE `schedule_setting` ( `job_id` int NOT NULL AUTO_INCREMENT COMMENT '任务ID', `bean_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT 'bean名称', `method_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '方法名称', `method_params` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '方法参数', `cron_expression` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT 'cron表达式', `remark` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '备注', `job_status` int DEFAULT NULL COMMENT '状态(1正常 0暂停)', `create_time` datetime DEFAULT NULL COMMENT '创建时间', `update_time` datetime DEFAULT NULL COMMENT '修改时间', PRIMARY KEY (`job_id`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
@Data public class ScheduleSetting extends Model{ /** * 任务ID */ @Id private Integer jobId; /** * bean名称 */ private String beanName; /** * 方法名称 */ private String methodName; /** * 方法参数 */ private String methodParams; /** * cron表达式 */ private String cronExpression; /** * 状态(1正常 0暂停) */ private Integer jobStatus; /** * 备注 */ private String remark; /** * 创建时间 */ private Date createTime; /** * 更新时间 */ private Date updateTime; } 
spring boot项目启动完成后,加载数据库里状态为正常的定时任务
@Service  
public class SysJobRunner implements CommandLineRunner {  
  
    private static final Logger logger = LoggerFactory.getLogger(SysJobRunner.class);  
  
    @Autowired  
    private CronTaskRegistrar cronTaskRegistrar;  
  
    @Override  
    public void run(String... args) {  
        // 初始加载数据库里状态为正常的定时任务  
        ScheduleSetting existedSysJob = new ScheduleSetting();
        List jobList = existedSysJob.selectList(new QueryWrapper().eq("job_status", 1));
        if (CollectionUtils.isNotEmpty(jobList)) {  
            for (ScheduleSetting job : jobList) {  
                SchedulingRunnable task = new SchedulingRunnable(job.getBeanName(), job.getMethodName(), job.getMethodParams());  
                cronTaskRegistrar.addCronTask(task, job.getCronExpression());  
            }  
            logger.info("定时任务已加载完毕...");  
        }  
    }  
}    
用来从spring容器里获取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 getBean(Class requiredType) {  
        return applicationContext.getBean(requiredType);  
    }  
  
    public static  T getBean(String name, Class 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);  
    }  
}     
@RestController
public class TestController {
   @Autowired
   private CronTaskRegistrar cronTaskRegistrar;
   /**
    * 添加定时任务
    *
    * @param sysJob
    * @return
    */
   @PostMapping("add")
   public boolean add(@RequestBody ScheduleSetting sysJob) {
      sysJob.setCreateTime(new Date());
      sysJob.setUpdateTime(new Date());
      boolean insert = sysJob.insert();
      if (!insert) {
         return false;
      }else {
         if (sysJob.getJobStatus().equals(1)) {// 添加成功,并且状态是1,直接放入任务器
            SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams());
            cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression());
         }
      }
      return insert;
   }
   /**
    * 修改定时任务
    *
    * @param sysJob
    * @return
    */
   @PostMapping("update")
   public boolean update(@RequestBody ScheduleSetting sysJob) {
      sysJob.setCreateTime(new Date());
      sysJob.setUpdateTime(new Date());
      // 查询修改前任务
      ScheduleSetting existedSysJob = new ScheduleSetting();
      existedSysJob = existedSysJob.selectOne(new QueryWrapper().eq("job_id", sysJob.getJobId()));
      // 修改任务
      boolean update = sysJob.update(new UpdateWrapper().eq("job_id", sysJob.getJobId()));
      if (!update) {
         return false;
      } else {
         // 修改成功,则先删除任务器中的任务,并重新添加
         SchedulingRunnable task1 = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());
         cronTaskRegistrar.removeCronTask(task1);
         if (sysJob.getJobStatus().equals(1)) {// 如果修改后的任务状态是1就加入任务器
            SchedulingRunnable task = new SchedulingRunnable(sysJob.getBeanName(), sysJob.getMethodName(), sysJob.getMethodParams());
            cronTaskRegistrar.addCronTask(task, sysJob.getCronExpression());
         }
      }
      return update;
   }
   /**
    * 删除任务
    *
    * @param jobId
    * @return
    */
   @PostMapping("del/{jobId}")
   public boolean del(@PathVariable("jobId") Integer jobId) {
      // 先查询要删除的任务信息
      ScheduleSetting existedSysJob = new ScheduleSetting();
      existedSysJob = existedSysJob.selectOne(new QueryWrapper().eq("job_id", jobId));
      // 删除
      boolean del = existedSysJob.delete(new QueryWrapper().eq("job_id", jobId));
      if (!del)
         return false;
      else {// 删除成功时要清除定时任务器中的对应任务
         SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());
         cronTaskRegistrar.removeCronTask(task);
      }
      return del;
   }
   // 停止/启动任务
   @PostMapping("changesStatus/{jobId}/{stop}")
   public boolean changesStatus(@PathVariable("jobId") Integer jobId, @PathVariable("stop") Integer stop) {
      // 修改任务状态
      ScheduleSetting scheduleSetting = new ScheduleSetting();
      scheduleSetting.setJobStatus(stop);
      boolean job_id = scheduleSetting.update(new UpdateWrapper().eq("job_id", jobId));
      if (!job_id) {
         return false;
      }
      // 查询修改后的任务信息
      ScheduleSetting existedSysJob = new ScheduleSetting();
      existedSysJob = existedSysJob.selectOne(new QueryWrapper().eq("job_id", jobId));
      // 如果状态是1则添加任务
      if (existedSysJob.getJobStatus().equals(1)) {
         SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());
         cronTaskRegistrar.addCronTask(task, existedSysJob.getCronExpression());
      } else {
         // 否则清除任务
         SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());
         cronTaskRegistrar.removeCronTask(task);
      }
      return true;
   }       

cron表达式语法:
[秒] [分] [小时] [日] [月] [周] [年]
注:[年]不是必须的域,可以省略[年],则一共6个域

通配符说明:
示例:
每隔5秒执行一次:*/5 * * * * ?
每隔1分钟执行一次:0 */1 * * * ?
每天23点执行一次:0 0 23 * * ?
每天凌晨1点执行一次:0 0 1 * * ?
每月1号凌晨1点执行一次:0 0 1 1 * ?
每月最后一天23点执行一次:0 0 23 L * ?
每周星期六凌晨1点实行一次:0 0 1 ? * L
在26分、29分、33分执行一次:0 26,29,33 * * * ?
每天的0点、13点、18点、21点都执行一次:0 0 0,13,18,21 * * ?
cron在线表达式生成器:https://cron.12qqe2.com/
这是小编在开发学习使用和总结的小Demo, 这中间或许也存在着不足,希望可以得到大家的理解和建议。如有侵权联系小编!