SpringBoot实现动态增删启停定时任务的方式
作者：奔向理想的星辰大海
在spring boot中,可以通过@EnableScheduling注解和@Scheduled注解实现定时任务,也可以通过SchedulingConfigurer接口来实现定时任务,但是这两种方式不能动态添加、删除、启动、停止任务,本文给大家介绍SpringBoot实现动态增删启停定时任务的方式,感兴趣的朋友一起看看吧
在spring boot项目中，可以通过@EnableScheduling注解和@Scheduled注解实现定时任务，也可以通过SchedulingConfigurer接口来实现定时任务。但是这两种方式不能动态添加、删除、启动、停止任务。
要实现动态增删启停定时任务功能，比较广泛的做法是集成Quartz框架。但是本人的开发原则是：在满足项目需求的情况下，尽量少的依赖其它框架，避免项目过于臃肿和复杂。
查看spring-context这个jar包中org.springframework.scheduling.ScheduledTaskRegistrar这个类的源代码，发现可以通过改造这个类就能实现动态增删启停定时任务功能。
定时任务列表页
定时任务执行日志
添加执行定时任务的线程池配置类
@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(4);
taskScheduler.setRemoveOnCancelPolicy(true);
taskScheduler.setThreadNamePrefix("TaskSchedulerThreadPool-");
return taskScheduler;
}
}添加ScheduledFuture的包装类。ScheduledFuture是ScheduledExecutorService定时任务线程池的执行结果。
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);
}
}
}添加Runnable接口实现类，被定时任务线程池调用，用来执行指定bean里面的方法。
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.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);
}
}添加定时任务注册类，用来增加、删除定时任务。
@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();
}
}添加定时任务示例类
@Component("demoTask")
public class DemoTask {
public void taskWithParams(String params) {
System.out.println("执行有参示例任务：" + params);
}
public void taskNoParams() {
System.out.println("执行无参示例任务");
}
}定时任务数据库表设计
定时任务数据库表设计
public class SysJobPO {
/**
* 任务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;
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;
}
}新增定时任务
新增定时任务
boolean success = sysJobRepository.addSysJob(sysJob);
if (!success)
return OperationResUtils.fail("新增失败");
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();修改定时任务，先移除原来的任务，再启动新任务
boolean success = sysJobRepository.editSysJob(sysJob);
if (!success)
return OperationResUtils.fail("编辑失败");
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();删除定时任务
boolean success = sysJobRepository.deleteSysJobById(req.getJobId());
if (!success)
return OperationResUtils.fail("删除失败");
else{
if (existedSysJob.getJobStatus().equals(SysJobStatus.NORMAL.ordinal())) {
SchedulingRunnable task = new SchedulingRunnable(existedSysJob.getBeanName(), existedSysJob.getMethodName(), existedSysJob.getMethodParams());
cronTaskRegistrar.removeCronTask(task);
}
}
return OperationResUtils.success();定时任务启动/停止状态切换
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);
}添加实现了CommandLineRunner接口的SysJobRunner类，当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 ISysJobRepository sysJobRepository;
@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
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("定时任务已加载完毕...");
}
}
}工具类SpringContextUtils，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> 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);
}
}到此这篇关于SpringBoot实现动态增删启停定时任务的文章就介绍到这了,更多相关SpringBoot定时任务内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！