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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