玩转SpringBoot之定时任务详解
pom文件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.7.7</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com</groupId> <artifactId>time</artifactId> <version>0.0.1-SNAPSHOT</version> <name>time</name> <description>Demo project for Spring Boot</description> <properties> <java.version>17</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--lombok依赖--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.16</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
package com.time.task; import lombok.extern.slf4j.Slf4j; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import java.time.LocalDateTime; /** * @Description: * @Author: Yourheart * @Create: 2023/1/7 23:08 */ @Configuration //1.主要用于标记配置类,兼备Component的效果。 @EnableScheduling // 2.开启定时任务 @Slf4j public class SaticScheduleTask { //3.添加定时任务 // @Scheduled(cron = "0/5 * * * * ?") //或直接指定时间间隔,例如:5秒 //@Scheduled(fixedRate=5000) /** * 当天23点17分0秒 */ // @Scheduled(cron = "0 17 23 * * *") /** * 每隔15秒执行一次 */ @Scheduled(cron = "0/15 * * * * *") private void configureTasks() { log.info("执行静态定时任务时间..."); } }
package com.time; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class TimeApplication { public static void main(String[] args) { SpringApplication.run(TimeApplication.class, args); } }
Cron表达式参数分别表示: 秒(0~59) 例如0/5表示每5秒 分(0~59) 时(0~23) 日(0~31)的某天,需计算 月(0~11) 周几( 可填1-7 或 SUN/MON/TUE/WED/THU/FRI/SAT) @Scheduled:除了支持灵活的参数表达式cron之外,还支持简单的延时操作,例如 fixedDelay ,fixedRate 填写相应的毫秒数即可。