> 参考的优秀文章

Task Execution and Scheduling

 

> 版本说明

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<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.2.14.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.webflow</groupId>
        <artifactId>spring-webflow</artifactId>
        <version>2.3.4.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.1.0</version>
    </dependency>
</dependencies>
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> 搭建最简单的Spring定时任务工程

Spring定时任务,给人的第一感觉就是简洁(>_<)

所需要的JAR,参考以上“版本说明”的POM文件,当然,不嫌麻烦,也可以一个个去下载。

把Spring通过web.xml注册进来

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<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:spring/spring.xml</param-value>
</context-param>

<listener>
    <description>Spring Context</description>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
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当然,需要告诉Spring去哪儿扫描组件。对了,也要告诉Spring我们是使用注解方式注册任务的

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
           http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
           http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">

    <context:component-scan base-package="com.nicchagil.*"/>
    <task:annotation-driven/>
    
</beans>
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附logback的配置

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<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder 
            by default -->
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
            </pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>D:/logs/application.log</file>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
            </pattern>
        </encoder>
    </appender>

    <root level="debug">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>
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好了,注册一个简单的任务,它每逢0秒执行,打印一个语句

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package com.nicchagil.springtask;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MyFirstSpringJob {
    
private final Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Scheduled(cron = "0 * * * * ?")
    public void run() {
        logger.info("MyFirstSpringJob trigger...");
    }

}
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如无意外,启动项目后,可见日志大致如下

22:42:00.024 [pool-1-thread-1] INFO  c.n.springtask.MyFirstSpringJob - MyFirstSpringJob trigger...
22:43:00.002 [pool-1-thread-1] INFO  c.n.springtask.MyFirstSpringJob - MyFirstSpringJob trigger...

 

> 如果你同时执行多个任务,且某些任务耗时较长,要配线程池哦(>_<)

如题。比如,你设置了12:00触发A任务、12:05触发B任务,如果A任务需耗时10分钟,并且没设置线程池,那么B任务有可能会被推迟到12:10以后再执行哦。

所以,这些情况,我们需设置线程池

<task:annotation-driven scheduler="myScheduler"/>
<task:scheduler id="myScheduler" pool-size="20"/>

:具体池的大小,视项目情况而定

 

将任务改为如下测试

第一个任务

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package com.nicchagil.springtask;

import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MyFirstSpringJob {
    
private final Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Scheduled(cron = "0 * * * * ?")
    public void run() {
        logger.info("MyFirstSpringJob trigger...");
        
        /* 模拟此Job需耗时5秒 */
        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}
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第二个任务

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package com.nicchagil.springtask;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MySecondSpringJob {
    
private final Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Scheduled(cron = "3 * * * * ?")
    public void run() {
        logger.info("MySecondSpringJob trigger...");
    }

}
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由日志可以看出,第一个任务由一个线程执行;而第二个任务启动时,由于第一个任务还未完成,则由另外一个线程执行

22:49:00.023 [myScheduler-1] INFO  c.n.springtask.MyFirstSpringJob - MyFirstSpringJob trigger...
22:49:03.002 [myScheduler-2] INFO  c.n.springtask.MySecondSpringJob - MySecondSpringJob trigger...

 

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