Spring boot 集成三种定时任务方式

三种定时任务方式分别为

 org.springframework.scheduling.annotation.Scheduled

 java.util.concurrent.ScheduledExecutorService

 java.util.Timer

示例如下：

1.   新建Maven项目  schedule

2.   pom.xml

<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.java</groupId>

    <artifactId>schedule</artifactId>

    <version>1.0.0</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.5.RELEASE</version>

    </parent>

    <dependencies>

        <!-- Spring Boot -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- 热部署 -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>springloaded</artifactId>

            <version>1.2.8.RELEASE</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>provided</scope>

        </dependency>

    </dependencies>

    <build>

        <finalName>${project.artifactId}</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <source>1.8</source>

                    <target>1.8</target>

                    <encoding>UTF-8</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

3.   ScheduleStarter.java

package com.java;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.scheduling.annotation.EnableScheduling;

@EnableScheduling

@SpringBootApplication

public class ScheduleStarter {

    public static void main(String[] args) {

        SpringApplication.run(ScheduleStarter.class, args);

    }

}

4.   ScheduledDemo.java

package com.java.schedule;

import org.springframework.scheduling.annotation.Scheduled;

import org.springframework.stereotype.Component;

@Component

public class ScheduledDemo {

    @Scheduled(cron = "0/5 * * * * *")

    public void demoTask() {

        System.out.println("[ ScheduledDemo ]\t\t" + System.currentTimeMillis());

    }

}

5.   ScheduledExecutorDemo.java

package com.java.schedule;

import java.util.concurrent.ScheduledExecutorService;

import java.util.concurrent.ScheduledThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import org.springframework.stereotype.Component;

@Component

public class ScheduledExecutorDemo {

    private ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(5);

    @PostConstruct

    public void demoTask() {

        executor.scheduleAtFixedRate(new Runnable() {

            @Override

            public void run() {

                System.out.println("[ ScheduledExecutorDemo ]\t" + System.currentTimeMillis());

            }

        }, 0, 5, TimeUnit.SECONDS);

    }

    @PreDestroy

    public void destory() {

        executor.shutdown();

    }

}

6.   TimerDemo.java

package com.java.schedule;

import java.util.Timer;

import java.util.TimerTask;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import org.springframework.stereotype.Component;

@Component

public class TimerDemo {

    private Timer timer = new Timer(true);

    @PostConstruct

    public void demoTask() {

        timer.scheduleAtFixedRate(new TimerTask() {

            @Override

            public void run() {

                System.out.println("[ TimerDemo ]\t\t\t" + System.currentTimeMillis());

            }

        }, 0, 5000);

    }

    @PreDestroy

    public void destory() {

        timer.cancel();

    }

}

7.   运行ScheduleStarter.java，启动测试

控制台每隔5秒打印如下信息

[ ScheduledDemo ]        1548156125005

[ TimerDemo ]            1548156127556

[ ScheduledExecutorDemo ]    1548156127566

三种定时任务都正常运行！

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