springboot系列 | 定时任务

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定时任务顾名思义就是设置一定时间让任务自动在规定时间上运行

依赖包引入

<?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.cwh</groupId>
	<artifactId>springbootScheduling</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springbootScheduling</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</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>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

开启定时任务注解

package com.cwh.springbootScheduling;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@EnableScheduling
@SpringBootApplication
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

定时任务

package com.cwh.springbootScheduling.task;

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 Tasks {

	private static final Logger log = LoggerFactory.getLogger(Tasks.class);

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

    /*
     *  @Scheduled(fixedRate = 1000) ：上一次开始执行时间点之后1秒再执行
		@Scheduled(fixedDelay = 1000) ：上一次执行完毕时间点之后1秒再执行
		@Scheduled(initialDelay=1000, fixedRate=5000) ：第一次延迟1秒后执行，之后按fixedRate的规则每5秒执行一次
     */
    @Scheduled(fixedRate = 1000)
    public void reportCurrentTime() {
        log.info("北京时间： {}", dateFormat.format(new Date()));
    }
}

运行测试

启动后可以发现控制台打印如下，说明任务开启成功

源码下载：https://github.com/Menc0/springbootScheduling