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！！！
执行定时任务的线程池配置类
import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.TaskScheduler;import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;@Configurationpublic class SchedulingConfig {@Beanpublic 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的包装类
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 ScheduledFutureimport 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) &¶ms.equals(that.params); } @Override public int hashCode() {if (params == null) { return Objects.hash(beanName, methodName);}return Objects.hash(beanName, methodName, params); }}定时任务注册类
用来增加、删除定时任务
@Componentpublic 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(); }}定时任务示例类
@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);}} 数据库表设计
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;实体类
@Datapublic 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;}定时任务预热
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
@Servicepublic class SysJobRunner implements CommandLineRunner {private static final Logger logger = LoggerFactory.getLogger(SysJobRunner.class);@Autowiredprivate CronTaskRegistrar cronTaskRegistrar;@Overridepublic 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...");}}} 工具类
用来从spring容器里获取bean
@Componentpublic class SpringContextUtils implements ApplicationContextAware {private static ApplicationContext applicationContext;@Overridepublic 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 getType(String name) {return applicationContext.getType(name);}}定时任务的：增/删/改/启动/暂停
@RestControllerpublic 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
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：
- * 表示所有值。 例如:在分的字段上设置 *,表示每一分钟都会触发。
- ” />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！