spring定时任务的实现（用cron表达式）

spring定时任务

1.在spring下的task.xml中添加配置

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd">

    <task:annotation-driven scheduler="scheduleTask"/>

    <task:scheduler id="scheduleTask" pool-size="200"/>

    <!-- 自动扫描的包名 -->
    <context:component-scan base-package="com.**.task" />


    <!--<!– 通过指定 javaBean 方式 –>-->
    <!--<bean id="myTaskXml" class="com.ybl.test.task.MyTaskXml"/>-->


</beans>

2.新建Java类

package com.ybl.task;

import com.ybl.clickcube.admin.advertiser.mapper.AdvertiserDOMapper;
import com.ybl.clickcube.admin.agency.mapper.AgencyDOMapper;
import com.ybl.clickcube.notification.bean.NotificationDO;
import com.ybl.clickcube.notification.mapper.NotificationDOMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * Created by wangxin on 2018/4/4.
 */
@Component
public class TimerTask {
    @Autowired
    AdvertiserDOMapper advertiserDOMapper;
    @Autowired
    NotificationDOMapper notificationDOMapper;
    @Autowired
    AgencyDOMapper agencyDOMapper;

    @Scheduled(cron = "0/5 * * * * ?")//每隔5秒隔行一次
    public void notifiTimer() {
        System.out.println("开始查询");
        List<Integer> advertiserIdList=advertiserDOMapper.selectuserIdListByAccount();
        List<Integer> agencyIdList=agencyDOMapper.selectuserIdListByAccount();
        advertiserIdList.addAll(agencyIdList);
        System.out.println(advertiserIdList);
        if(advertiserIdList.size()!=0) {
            notificationDOMapper.insertIdIn(advertiserIdList);
        }
        else{
        }
    }
}

3.corn解释

Cron表达式是一个字符串，字符串以5或6个空格隔开，分为6或7个域，每一个域代表一个含义，Cron有如下两种语法格式：

Seconds Minutes Hours DayofMonth Month DayofWeek Year或
Seconds Minutes Hours DayofMonth Month DayofWeek

每一个域可出现的字符如下：
Seconds:可出现", - * /"四个字符，有效范围为0-59的整数
Minutes:可出现", - * /"四个字符，有效范围为0-59的整数
Hours:可出现", - * /"四个字符，有效范围为0-23的整数
DayofMonth:可出现", - * / ? L W C"八个字符，有效范围为0-31的整数
Month:可出现", - * /"四个字符，有效范围为1-12的整数或JAN-DEc
DayofWeek:可出现", - * / ? L C #"四个字符，有效范围为1-7的整数或SUN-SAT两个范围。1表示星期天，2表示星期一，依次类推
Year:可出现", - * /"四个字符，有效范围为1970-2099年

spring定时任务的实现（用cron表达式）

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