在开发中经常遇到一些定时任务，比如到点自动爬取数据、到点自动执行清除数据库信息之类，使用spring的Schedule功能就可以实现需求。
快速入门：从https://cron.qqe2.com/里面根据自己的需求获取cron表达式
编写对应的代码：
在启动类上面加一个注解：
执行效果：
相关参数： 多重任务（开启线程池）：如果需要多个定时任务需要重写SchedulingConfigurer接口：
package com.github.binarywang.demo.wx.mp.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
@Configuration
public class ScheduledConfig implements SchedulingConfigurer {
private static final int TASK_POOL_SIZE = 5;
private static final String TASK_THREAD_PREFIX = "cron-task-";
@Override
public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
ThreadPoolTaskScheduler taskPool = new ThreadPoolTaskScheduler();
taskPool.setPoolSize(TASK_POOL_SIZE);
taskPool.setThreadNamePrefix(TASK_THREAD_PREFIX);
taskPool.initialize();
scheduledTaskRegistrar.setTaskScheduler(taskPool);
}
}
测试代码：
package com.github.binarywang.demo.wx.mp.utils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class myCron {
@Scheduled(cron = "0/5 * * * * ? ")
public void saying() {
log.debug("========= 这里是定时任务 ================");
}
@Scheduled(cron = "0/7 * * * * ? ")
public void saying2() {
log.error("========= 7秒的这里是定时任务 ================");
}
@Scheduled(cron = "10 * * * * ? ")
public void saying3() {
log.warn("========= 10秒的这里是定时任务 ================");
}
}
效果：
2021-10-24 10:05:42.004 ERROR 8684 --- [ cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:05:45.001 DEBUG 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:05:49.006 ERROR 8684 --- [ cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:05:50.004 DEBUG 8684 --- [ cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:05:55.002 DEBUG 8684 --- [ cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:05:56.007 ERROR 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:06:00.010 DEBUG 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:00.010 ERROR 8684 --- [ cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:06:05.006 DEBUG 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:07.004 ERROR 8684 --- [ cron-task-5] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:06:10.002 DEBUG 8684 --- [ cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:10.002 WARN 8684 --- [ cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 10秒的这里是定时任务 ================ 2021-10-24 10:06:14.005 ERROR 8684 --- [ cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:06:15.012 DEBUG 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:20.012 DEBUG 8684 --- [ cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:21.014 ERROR 8684 --- [ cron-task-5] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 7秒的这里是定时任务 ================ 2021-10-24 10:06:25.004 DEBUG 8684 --- [ cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron : ========= 这里是定时任务 ================ 2021-10-24 10:06:27.864 INFO 8684 --- [ Thread-2] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor' Process finished with exit code 130
