一 Quartz

一个开源的作业调度框架，配置执行定时任务

二 配置

1 依赖

<dependency>
    <groupId>org.quartz-schedulergroupId>
    <artifactId>quartzartifactId>
    <version>2.2.3version>
  dependency>
  <dependency>
    <groupId>org.quartz-schedulergroupId>
    <artifactId>quartz-jobsartifactId>
    <version>2.2.3version>
 dependency>

2 web.xml

<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
    listener>
    <context-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>
            classpath:spring-quartz.xml
        param-value>
    context-param>

3.spring-quartz.xml

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd " default-autowire="byType">
 

   <bean id="importOneJob" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject" ref="importOneTable" />          //执行类的实例
        <property name="targetMethod" value="run" />                   //执行方法
        <property name="concurrent" value="false" />
        <property name="arguments">
            <list>list>
        property>
    bean> 



   <bean id="cronTrigger2" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean"> 
        <property name="jobDetail" ref="importOneJob" />                 //上面任务的Task配置bean
        <property name="cronExpression" value="0 */1 * * * ?" />         //触发时机表达式  cron表达式在文章的最末尾会说
    bean> 
 
     <bean id="schedulerFactoryBean" class="org.springframework.scheduling.quartz.SchedulerFactoryBean" autowire="no">
        <property name="triggers">
            <list>
                <ref bean="cronTrigger2" />                           //上面配置的触发器
            list>
        property>
    bean> 
beans>  

上面的触发器配置中可配置CronTriggerBean实现，若报错：

Caused by: java.lang.IncompatibleClassChangeError:class org.springframework.scheduling.quartz.SimpleTriggerBean has interface org.quartz.SimpleTrigger as super class。

是因为Quartz2修改了部分API
将CronTriggerBean改为CronTriggerFactoryBean，JobDetailBean改为JobDetailFactoryBean即可

4 执行类

package com.xxxx.xx.job;
import com.xxxx.xx.util.Conn;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;


@Component("importOneTable")
public class importOneTable implements Runnable {
    private final static Logger logger = LoggerFactory.getLogger(ImportOneTable.class);

    //上面Task配置中 执行的方法
    @Override
    public void run() {
        try {
            System.out.println("importOneTable任务开始执行");
            //此处执行具体的importOneTable方法
            System.out.println("importOneTable任务执行结束");
        } finally {
            Conn.close();
        }
    }
}

三 定时任务和Cron表达式

Cron表达式多用在调度任务，用来表示时间例如每个一周，每隔一个小时，具体用法在我的另一片博客中有详细介绍
点击：SpringBoot定时任务@EnableScheduling和cron表达式

定时任务的方法也很多，上面链接那篇博客中介绍了@EnableScheduling实现定时任务
文章基于SpringBoot，以注解的形式配置，那同样quartz是否可以在SpringBoot那种简化配置文件的风格中，以注解来配置呢？答案是可以的，大家可以参考这篇文章：
springboot整合Quartz实现动态配置定时任务