原生的Java定时器
使用Java.util包下的定时器也很简单,具体代码如下:
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//设置定时器开始时间 Date time = sdf.parse( "2020-10-01 16:40:00" ); //设置定时器 Timer timer = new Timer(); //第三个参数表示每隔多久循环一次 timer.schedule( new TimerTask() { @Override public void run() { System.out.println( "嗨" ); } }, time, 3000 ); |
Spring的定时器
- 1)导包,除了spring提供的包之外,还需要quartz包(可以到maven仓库中去下载)
- 2)自定义Task类:
当定时器启动时,Spring执行我们指定Task中的方法
- 3)MethodInvokingJobDetailFactoryBean类:
将自定义的Task类交给MethodInvokingJobDetailFactoryBean,并告诉它Task的执行方法,由它负责去执行
- 4)CronTriggerFactoryBean触发器:
定义定时器触发的时间,以及执行对象
- 5)SchedulerFactoryBean:
将触发器对象交给它统一保管
配置信息如下:
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd "> <!-- 定时器--> < bean id = "myTask" class = "com.cjh.MyTask" ></ bean > <!-- 创建一个Spring提供好的计时器对象,用来做倒计时管控--> < bean id = "taskExecutor" class = "org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean" > < property name = "targetObject" ref = "myTask" /> < property name = "targetMethod" value = "test" /> </ bean > <!-- 触发器--> < bean id = "cronTrigger" class = "org.springframework.scheduling.quartz.CronTriggerFactoryBean" > < property name = "jobDetail" ref = "taskExecutor" /> < property name = "cronExpression" value = "30/5 41 18 * * ?" /> </ bean > <!-- 管理触发器对象的容器--> < bean class = "org.springframework.scheduling.quartz.SchedulerFactoryBean" > < property name = "triggers" > < list > < ref bean = "cronTrigger" /> </ list > </ property > </ bean > </ beans > |
- 6)主函数
只需要加载配置文件,触发器就会启动
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public class TestMain { public static void main(String[] args) throws MessagingException, ParseException { ApplicationContext context = new ClassPathXmlApplicationContext( "ApplicationContext.xml" ); } } |
以上就是浅析spring定时器的使用的详细内容,更多关于spring 定时器的资料请关注服务器之家其它相关文章!
原文链接:https://segmentfault.com/a/1190000025185454?utm_source=tuicool&utm_medium=referral