springboot動態設置定時任務

環境變量中設置執行時間， 

單個執行定時任務：

import com.ksyun.alertmanager.service.AlertManagerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.config.Task;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.text.ParseException;
import java.util.Date;
import java.util.Map;

@Component
@Configuration
@EnableScheduling
public class AlertCriticalTask implements SchedulingConfigurer {


    public static String cron;

    @Autowired
    private AlertManagerService alertManagerService;

    /**
     * Callback allowing a {@link TaskScheduler
     * TaskScheduler} and specific {@link Task Task}
     * instances to be registered against the given the {@link ScheduledTaskRegistrar}.
     *
     * @param taskRegistrar the registrar to be configured.
     */
    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {

        //項目部署時，會在這裏執行一次，從數據庫拿到cron表達式
        Map<String, String> getenv = System.getenv();
        cron = getenv.get("alertmanager.critical");
        //cron = "*/30 * * * * ?";
        if (cron == null){
            cron = "0 0 0,23 * * ?";
        }

        Runnable task = new Runnable() {
            @Override
            public void run() {
                //任務邏輯代碼部分.
                System.out.println("*********************告警信息處理服務--30秒執行一次*********************");
                try {
                    //執行的實現類
                    alertManagerService.getDataResponses();
                } catch (ParseException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };

        Trigger trigger = new Trigger() {
            @Override
            public Date nextExecutionTime(TriggerContext triggerContext) {
                //任務觸發，可修改任務的執行週期.
                //每一次任務觸發，都會執行這裏的方法一次，重新獲取下一次的執行時間
                cron = getenv.get("alertmanager.critical");
                //cron = "*/30 * * * * ?";
                CronTrigger trigger = new CronTrigger(cron);
                Date nextExec = trigger.nextExecutionTime(triggerContext);
                return nextExec;
            }
        };
        taskRegistrar.addTriggerTask(task, trigger);

    }
}

 循環遍歷，批量執行定時任務：

import com.ksyun.alertmanager.service.AlertManagerService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.config.Task;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

@Slf4j
@Component
@Configuration
@EnableScheduling
public class TaskList implements SchedulingConfigurer {

    @Autowired
    private AlertManagerService alertManagerService;

    /**
     * Callback allowing a {@link TaskScheduler
     * TaskScheduler} and specific {@link Task Task}
     * instances to be registered against the given the {@link ScheduledTaskRegistrar}.
     *
     * @param taskRegistrar the registrar to be configured.
     */
    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {

        List<String> stringList = new ArrayList<>();
        //項目部署時，會在這裏執行一次，從數據庫拿到cron表達式
        Map<String, String> getenv = System.getenv();
        /*cron = getenv.get("alertmanager.critical");
        if (cron == null){
            cron = "0 0 0,23 * * ?";
        }*/
        //cron = "*/30 * * * * ?";
        /*stringList.add(getenv.get("alertmanager.critical"));
        stringList.add(getenv.get("alertmanager.none"));
        stringList.add(getenv.get("alertmanager.warning"));*/

        stringList.add("*/10 * * * * ?");
        stringList.add("*/30 * * * * ?");
        stringList.add("*/50 * * * * ?");

        stringList.forEach(cron ->{

            Runnable task = new Runnable() {
                @Override
                public void run() {
                    //任務邏輯代碼部分.
                    log.info("*********************告警信息處理服務" + cron + "級別的告警信息執行開始*********************");
                    try {
                        alertManagerService.getDataResponses(cron);
                    } catch (ParseException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            };

            Trigger trigger = new Trigger() {
                @Override
                public Date nextExecutionTime(TriggerContext triggerContext) {
                    //任務觸發，可修改任務的執行週期.
                    //每一次任務觸發，都會執行這裏的方法一次，重新獲取下一次的執行時間
                    //cron = getenv.get("alertmanager.critical");
                    //cron = "*/30 * * * * ?";
                    CronTrigger trigger = new CronTrigger(cron);
                    Date nextExec = trigger.nextExecutionTime(triggerContext);
                    return nextExec;
                }
            };
            taskRegistrar.addTriggerTask(task, trigger);
        });

    }
}