Springboot定时任务遇到的问题解决

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前言：在使用Springboot整合定时任务，发现当某个定时任务执行出现执行时间过长的情况时会阻塞其他定时任务的执行。

问题定位

后续通过翻查Springboot的文档以及打印日志（输出当前线程信息）得知问题是由于Springboot默认使用只要1个线程处理定时任务。

问题复盘

需要注意示例的Springboot版本为2.1.3.RELEASE。

关键pom文件配置

    <!--继承父项目-->    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>        ...省略非关键配置        <!-- 引入依赖-->    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies>

定时任务

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Component;/** * 定时任务 * @author RJH * create at 2019-03-29 */@Componentpublic class SimpleTask {    private static Logger logger= LoggerFactory.getLogger(SimpleTask.class);    /**     * 执行会超时的任务，定时任务间隔为5000ms(等价于5s)     */    @Scheduled(fixedRate = 5000)    public void overtimeTask(){        try {            logger.info("current run by overtimeTask");            //休眠时间为执行间隔的2倍            Thread.sleep(10000);        } catch (InterruptedException e) {            e.printStackTrace();        }    }    /**     * 正常的定时任务     */    @Scheduled(fixedRate = 5000)    public void simpleTask(){        logger.info("current run by simpleTask");    }}

启动类

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.scheduling.annotation.EnableScheduling;@SpringBootApplication@EnableSchedulingpublic class TaskDemoApplication {    public static void main(String[] args) {        SpringApplication.run(TaskDemoApplication.class, args);    }}

运行结果

...省略非关键信息2019-03-29 21:22:38.410  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask  <a style="color:transparent">本文来源gao($daima.com搞@代@#码(网5</a>                : current run by simpleTask2019-03-29 21:22:38.413  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by overtimeTask2019-03-29 21:22:48.413  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by simpleTask2019-03-29 21:22:48.414  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by overtimeTask2019-03-29 21:22:58.418  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by simpleTask2019-03-29 21:22:58.418  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by overtimeTask2019-03-29 21:23:08.424  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by simpleTask2019-03-29 21:23:08.424  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by overtimeTask2019-03-29 21:23:18.425  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by simpleTask2019-03-29 21:23:18.426  INFO 59731 --- [   scheduling-1] com.rjh.task.SimpleTask                  : current run by overtimeTask...

结果分析

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