Spring 实现 SchedulingConfigurer 接口完成动态定时任务（配合数据库动态执行）

import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Select;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.EnableScheduling;import org.springframework.scheduling.annotation.SchedulingConfigurer;import org.springframework.scheduling.config.ScheduledTaskRegistrar;import org.springframework.scheduling.support.CronTrigger;import org.springframework.util.StringUtils;import java.time.LocalDateTime;@Configuration@EnableSchedulingpublic class CompleteScheduleConfig implements SchedulingConfigurer {    @Mapper    public interface CronMapper {        @Select("select cron from cron limit 1")        String getCron();    }    @Autowired    @SuppressWarnings("all")    CronMapper cronMapper;    /**     * 执行定时任务.     */    @Override    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {        taskRegistrar.addTriggerTask(                //1.添加任务内容(Runnable)                () -> System.out.println("执行定时任务2: " + LocalDateTime.now().toLocalTime()),                //2.设置执行周期(Trigger)                triggerContext -> {                    //2.1 从数据库获取执行周期                    String cron = cronMapper.getCron();                    //2.2 合法性校验.                    if (StringUtils.isEmpty(cron)) {                        // Omitted Code ..                    }                    //2.3 返回执行周期(Date)                    return new CronTrigger(cron).nextExecutionTime(triggerContext);                }        );    }}

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