springboot 使用secheduled任务调度

本来没啥好记的，但因为自己在使用过程中搜到cron表达式写错的影响，自己代码有bug的影响，错误以为scheduled没有生效，徒劳浪费时间。因此，在这里将类似配置都记载下来。

pom.xml:

<?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>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zhen</groupId>
    <artifactId>scheduled-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>scheduled-test</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <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>
    </dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
</project>

启动类：

package com.zhen.scheduledtest;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
 
/**
 * @author zhen
 */
@SpringBootApplication
@EnableScheduling
public class ScheduledTestApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(ScheduledTestApplication.class, args);
    }
 
}

测试task：

package com.zhen.scheduledtest.task;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

/**
 * @author zhen
 */
@Component
public class TestTask {

    /**
     * 每分钟30s 执行一次打印
     */
    @Scheduled(cron = "30 * * * * ? ")
    public void doPrint(){
        System.out.println("----------------");
    }
}