SpringBoot 学习记录(十): scheduler

这篇我们来学习如何在spring_boot中启用定时任务。

一，先说明下定时表达式

"0 0 12 * * ?"      每天中午十二点触发
"0 15 10 ? * *"    每天早上10：15触发
"0 15 10 * * ?"    每天早上10：15触发
"0 15 10 * * ? *"   每天早上10：15触发
"0 15 10 * * ? 2005"    2005年的每天早上10：15触发
“0 * 14 * * ?"    每天从下午2点开始到2点59分每分钟一次触发
"0 0/5 14 * * ?"    每天从下午2点开始到2：55分结束每5分钟一次触发
"0 0/5 14,18 * * ?"     每天的下午2点至2：55和6点至6点55分两个时间段内每5分钟一次触发
"0 0-5 14 * * ?"    每天14:00至14:05每分钟一次触发
"0 10,44 14 ? 3 WED"    三月的每周三的14：10和14：44触发
"0 15 10 ? * MON-FRI"   每个周一、周二、周三、周四、周五的10：15触发

二，新建定时任务

package com.example.scheduler;

import java.text.SimpleDateFormat;
import java.util.Date;

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

@Component
public class SchedulerTask {
	
	Logger logger = LoggerFactory.getLogger(this.getClass());

	private int count = 0;
	
	private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

	
	
	/**
	 * 每秒钟执行一次
	 */
	@Scheduled(cron = "*/1 * * * * ?")
	private void process() {
		logger.info("======================= this is scheduler task runing  " + (count++));
	}
	
	/**
         * 每5秒执行一次
     	*/
   	 @Scheduled(fixedRate = 1000*5)
   	 public void reportCurrentTime() {
    		logger.info("======================= 当前时间：" + dateFormat.format(new Date()));
   	 }
}

启动服务，查看控制台：

2017-04-14 21:22:14.213  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= 当前时间：21:22:14
2017-04-14 21:22:14.307  INFO 1708 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8088 (http)
2017-04-14 21:22:14.310 DEBUG 1708 --- [           main] o.s.w.c.s.StandardServletEnvironment     : Adding [server.ports] PropertySource with highest search precedence
2017-04-14 21:22:14.318  INFO 1708 --- [           main] com.example.DemoApplication              : Started DemoApplication in 11.796 seconds (JVM running for 12.361)
2017-04-14 21:22:15.002  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  0
2017-04-14 21:22:16.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  1
2017-04-14 21:22:17.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  2
2017-04-14 21:22:18.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  3
2017-04-14 21:22:19.002  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  4
2017-04-14 21:22:19.203  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= 当前时间：21:22:19
2017-04-14 21:22:20.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  5
2017-04-14 21:22:21.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  6
2017-04-14 21:22:22.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  7
2017-04-14 21:22:23.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  8
2017-04-14 21:22:24.001  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= this is scheduler task runing  9
2017-04-14 21:22:24.204  INFO 1708 --- [pool-2-thread-1] com.example.scheduler.SchedulerTask      : ======================= 当前时间：21:22:24

一个简单的定时任务就完成了。

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由于最近的项目需要配合写前端页面，趁热打铁，接下来想总结一下前端相关知识，下个系列预定为java_web 学习记录

关于spring_boot还有很多需要学习的知识点，这里只是暂时告一段落，

大家可以移步博客继续学习：http://412887952-qq-com.iteye.com/category/356333

最后提供SpringBoot 学习系列源码供大家参考：https://pan.baidu.com/s/1nuRHQw5