spring boot使用TaskScheduler实现动态增删启停定时任务

TaskScheduler

概述

TaskScheduler是spring 3.0版本后，自带了一个定时任务工具，不用配置文件，可以动态改变执行状态。也可以使用cron表达式设置定时任务。

spring boot使用TaskScheduler实现动态增删启停定时任务

SchedulingConfig：添加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;

@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;
    }
}

ScheduledTask：添加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 ScheduledFuture<?> future;

    /**
     * 取消定时任务
     */
    public void cancel() {
        ScheduledFuture<?> future = this.future;
        if (future != null) {
            future.cancel(true);
        }
    }
}

SchedulingRunnable：添加Runnable接口实现类

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

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ReflectionUtils;

import java.lang.reflect.Method;
import java.util.Objects;


public class SchedulingRunnable implements Runnable {

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

    private final String beanName;

    private final String methodName;

    private final 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);
    }
}

CronTaskRegistrar：添加定时任务注册类，用来增加、删除定时任务

import com.example.testspringboot.cron.ScheduleResult;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.config.CronTask;
import org.springframework.stereotype.Component;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 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);
    private final Map<Integer, ScheduleResult> schedulerJob = new HashMap<>();
    @Autowired
    private TaskScheduler taskScheduler;

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

    public void addCronTask(ScheduleResult scheduleResult) {
        SchedulingRunnable task = new SchedulingRunnable(scheduleResult.getBeanName(), scheduleResult.getMethodName(), scheduleResult.getMethodParams());
        String cronExpression = scheduleResult.getCronExpression();

        CronTask cronTask = new CronTask(task, cronExpression);
        // 如果当前包含这个任务，则移除
        if (this.scheduledTasks.containsKey(task)) {
            removeCronTask(scheduleResult.getBeanName(), scheduleResult.getMethodName(), scheduleResult.getMethodParams());
        }
        schedulerJob.put(scheduleResult.getJobId(), scheduleResult);
        this.scheduledTasks.put(task, scheduleCronTask(cronTask));
    }

    public void removeCronTask(String beanName, String methodName, String methodParams) {
        SchedulingRunnable task = new SchedulingRunnable(beanName, methodName, methodParams);
        ScheduledTask scheduledTask = this.scheduledTasks.remove(task);
        if (scheduledTask != null) {
            scheduledTask.cancel();
        }
    }

    public void removeCronTask(ScheduleResult scheduleResult) {
        schedulerJob.put(scheduleResult.getJobId(), scheduleResult);
        removeCronTask(scheduleResult.getBeanName(), scheduleResult.getMethodName(), scheduleResult.getMethodParams());
    }

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


    public Map<Runnable, ScheduledTask> getScheduledTasks() {
        return scheduledTasks;
    }

    public Map<Integer, ScheduleResult> getSchedulerJob() {
        return schedulerJob;
    }

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

        this.scheduledTasks.clear();
    }

    public ScheduleResult getSchedulerByJobId(Integer jobId) {
        for (ScheduleResult job : findAllTask()) {
            if (jobId.equals(job.getJobId())) {
                return job;
            }
        }
        return null;
    }

    public List<ScheduleResult> findAllTask() {
        List<ScheduleResult> ScheduleResults = new ArrayList<>();
        Set<Map.Entry<Integer, ScheduleResult>> entries = schedulerJob.entrySet();
        for (Map.Entry<Integer, ScheduleResult> en : entries) {
            ScheduleResults.add(en.getValue());
        }
        return ScheduleResults;
    }


}

CronUtils：校验Cron表达式的有效性

import org.springframework.scheduling.support.CronExpression;

public class CronUtils {
    /**
     * 返回一个布尔值代表一个给定的Cron表达式的有效性
     *
     * @param cronExpression Cron表达式
     * @return boolean 表达式是否有效
     */
    public static boolean isValid(String cronExpression) {
        return CronExpression.isValidExpression(cronExpression);
    }


}

ScheduleResult：添加定时任务实体类

import lombok.Data;


@Data
public class ScheduleResult {
    /**
     * 任务ID
     */
    private Integer jobId;
    /**
     * bean名称
     */
    private String beanName;
    /**
     * 方法名称
     */
    private String methodName;
    /**
     * 方法参数: 执行service里面的哪一种方法
     */
    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 String createTime;
    /**
     * 更新时间
     */
    private String updateTime;

}

ScheduleJobStatus：任务状态枚举类型

public enum ScheduleJobStatus {
    /**
     * 暂停
     */
    PAUSE,

    /**
     * 正常
     */
    NORMAL;


}

SpringContextUtils类：从spring容器里获取bean

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

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

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    // 通过name获取 Bean.
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);

    }

    // 通过class获取Bean.
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);

    }

    // 通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }

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

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

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

ScheduleJobService：增删启停service方法

@Service
@Slf4j
public class ScheduleJobService {


    @Autowired
    private CronTaskRegistrar cronTaskRegistrar;

    public void addScheduleJob(ScheduleResult scheduleResult) {
        long currentTimeMillis = System.currentTimeMillis();
        scheduleResult.setCreateTime(formatTimeYMD_HMS_SSS(currentTimeMillis));
        scheduleResult.setUpdateTime(formatTimeYMD_HMS_SSS(currentTimeMillis));
        scheduleResult.setJobId(findAllTask().size() + 1);
        if (scheduleResult.getJobStatus().equals(ScheduleJobStatus.NORMAL.ordinal())) {
            log.info("Stop or pause: is now on");
            cronTaskRegistrar.addCronTask(scheduleResult);
            return;
        }
        cronTaskRegistrar.getSchedulerJob().put(scheduleResult.getJobId(), scheduleResult);
    }

    public void editScheduleJob(ScheduleResult currentSchedule) {
        //先移除
        cronTaskRegistrar.removeCronTask(currentSchedule.getBeanName(), currentSchedule.getMethodName(), currentSchedule.getMethodParams());
        ScheduleResult pastScheduleJob = cronTaskRegistrar.getSchedulerByJobId(currentSchedule.getJobId());
        if (pastScheduleJob == null) {
            System.out.println("没有这个任务");
            return;
        }
        //然后判断是否开启, 如果开启的话，现在立即执行
        startOrStopSchedulerJob(currentSchedule, true);
    }

    public void deleteScheduleJob(ScheduleResult scheduleResult) {
        // 清除这个任务
        cronTaskRegistrar.removeCronTask(scheduleResult.getBeanName(), scheduleResult.getMethodName(), scheduleResult.getMethodParams());
        // 清除这个任务的数据
        cronTaskRegistrar.getSchedulerJob().remove(scheduleResult.getJobId());
    }

    public void startOrStopScheduler(ScheduleResult scheduleResult) {
        cronTaskRegistrar.getSchedulerJob().get(scheduleResult.getJobId()).setJobStatus(scheduleResult.getJobStatus());
        startOrStopSchedulerJob(scheduleResult, false);
    }

    private void startOrStopSchedulerJob(ScheduleResult scheduleResult, boolean update) {
        // 更新时间
        scheduleResult.setUpdateTime(formatTimeYMD_HMS_SSS(System.currentTimeMillis()));
        if (scheduleResult.getJobStatus().equals(ScheduleJobStatus.NORMAL.ordinal())) {
            System.out.println("停止或暂停：现在是开启");
            cronTaskRegistrar.addCronTask(scheduleResult);
            return;
        }
        System.out.println("停止或暂停：现在是暂停");
        if (update){
            cronTaskRegistrar.removeCronTask(scheduleResult);
            return;
        }
        cronTaskRegistrar.removeCronTask(scheduleResult.getBeanName(), scheduleResult.getMethodName(), scheduleResult.getMethodParams());
    }

    public List<ScheduleResult> findAllTask() {
        return cronTaskRegistrar.findAllTask();
    }


    // 转换为年-月-日 时:分:秒
    private String formatTimeYMD_HMS_SSS(long time) {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").format(time);
    }

}

cronController：访问接口

import com.example.testspringboot.cron.ScheduleResult;
import com.example.testspringboot.cron.ScheduleJobService;
import com.example.testspringboot.cron.utils.CronUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class cronController {
    @Autowired
    private ScheduleJobService scheduleJobService;
    /**
     * 测试上传的用例文件, 获取详细执行结果
     */
    @PostMapping("/add")
    void executeTestOneFile(@RequestBody ScheduleResult scheduleResult) {
        boolean valid = CronUtils.isValid(scheduleResult.getCronExpression());
        if (valid){
            System.out.println("校验成功， 添加任务");
            scheduleResult.setMethodParams(scheduleResult.getBranch()+scheduleResult.getCaseDir());
            scheduleJobService.addScheduleJob(scheduleResult);
        }else {
            System.out.println("校验失败");
        }
    }

    @PostMapping("/stop")
    void end(@RequestBody ScheduleResult scheduleResult) {
        Gson gson = new Gson();

        System.out.println("================");
        System.out.println(scheduleResult);
        System.out.println("=================");
        scheduleResult.setJobStatus(0);
        scheduleJobService.startOrStopScheduler(scheduleResult);
    }
    @PostMapping("/start")
    void start(@RequestBody ScheduleResult scheduleResult) {
        System.out.println("================");
        System.out.println(scheduleResult);
        System.out.println("=================");
        scheduleResult.setJobStatus(1);
        scheduleJobService.startOrStopScheduler(scheduleResult);
    }

    @PostMapping("/edit")
    void edit(@RequestBody ScheduleResult scheduleResult) {
        System.out.println("=======edit=========");
        System.out.println(scheduleResult);
        System.out.println("=================");
        scheduleJobService.editScheduleJob(scheduleResult);
    }

    @PostMapping("/delete")
    void delete(@RequestBody ScheduleResult scheduleResult) {
        System.out.println("=======delete=========");
        System.out.println(scheduleResult);
        System.out.println("=================");
        scheduleJobService.deleteScheduleJob(scheduleResult);
    }

    @GetMapping("/tasks")
    List<ScheduleResult> get() throws Exception {
        List<ScheduleResult> allTask = scheduleJobService.findAllTask();
        System.out.println("现在的定时任务数量 = " + allTask.size());
        System.out.println("现在的定时任务 = " + allTask);
        return allTask;
    }


}

c1：测试bean

import org.springframework.stereotype.Component;

@Component
public class c1 {
    public void test1(String y){
        System.out.println("这个是test1的bean : " + y);
    }
    public void test2(){
        System.out.println("这个是test1的bean中test2方法");
    }
}

init：项目启动后的定时任务

import com.example.testspringboot.cron.ScheduleJobService;
import com.example.testspringboot.cron.ScheduleResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class init  implements CommandLineRunner {
    @Autowired
    private ScheduleJobService scheduleJobService;

    @Override
    public void run(String... args) throws Exception {
        System.out.println("开始珍惜");
        ScheduleResult scheduleResult = new ScheduleResult();
        scheduleResult.setBeanName("c1");
        scheduleResult.setMethodName("test1");
        scheduleResult.setCronExpression("0/25 * * * * *");
        scheduleResult.setJobStatus(1);
        scheduleResult.setMethodParams("test1");
        scheduleJobService.addScheduleJob(scheduleResult);
        scheduleJobService.findAllTask();
    }
}