[spring-boot]用spring-boot做定时任务

谁践踏了优雅 2022-05-18 02:24 169阅读 0赞

和上篇文章的配置一样.

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com</groupId>
        <artifactId>ojama</artifactId>
        <version>0.1.0</version>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
        </parent>
    
        <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>
            <dependency>
                <groupId>com.jayway.jsonpath</groupId>
                <artifactId>json-path</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
        <repositories>
            <repository>
                <id>spring-releases</id>
                <url>https://repo.spring.io/libs-release</url>
            </repository>
        </repositories>
        <pluginRepositories>
            <pluginRepository>
                <id>spring-releases</id>
                <url>https://repo.spring.io/libs-release</url>
            </pluginRepository>
        </pluginRepositories>
    </project>

多加一个类

package com.ojama.scheduledtask;
    
    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 ScheduledTasks {
    	private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);
    	private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
    	@Scheduled(fixedRate = 5000)
    	public void reportCurrentTime() {
    		log.info("The time is now {}", dateFormat.format(new Date()));
    	}
    }

此类的用处是 每过5秒打印当前时间.schedule表示时间表的意思.

application类

package com.ojama;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.EnableScheduling;
    
    /**
     * Hello world!
     *
     */
    @SpringBootApplication
    @EnableScheduling
    public class App {
    	public static void main(String[] args) {
    		SpringApplication.run(App.class, args);
    	}
    }

@EnableScheduling表示启用定时任务.

![70][]

可以看到 每5秒开始输出时间.

ps 时间是相对的

[70]: /images/20220518/cc742716b0ef41519a53d4264d9847ec.png