SpringBoot中定时任务默认是串行执行 如何设置并行

SpringBoot项目中，定时任务默认是串行执行的，不论启动多少任务，都是一个执行完成，再执行下一个。

如何设置并行呢？ @EnableAsync  和@Async 这两个注解来实现 ，具体如下：

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">
    <parent>
        <artifactId>mydemo</artifactId>
        <groupId>com.itstudy</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>mvcdemo</artifactId>

    <name>mvcdemo</name>
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <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>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.30</version>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.9.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

启动文件App.java

@EnableScheduling
@EnableAsync
@SpringBootApplication
public class App
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );

        SpringApplication app = new SpringApplication(App.class);
        //关闭banner
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }
}

@Service
@Async
public class TaskSecond {

    private Logger logger = LoggerFactory.getLogger(TaskSecond.class);
    //@Scheduled( cron = "0/2 * * * * * ")
    @Scheduled(fixedDelay = 20000,initialDelay = 2000)
    public void test(){
        try {
            logger.info(" second start");

            TimeUnit.SECONDS.sleep(10);
           logger.info(" second end");

        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

@Service
@Async
public class TaskFirst {
    private Logger logger = LoggerFactory.getLogger(TaskSecond.class);
    //@Scheduled( cron = "0/2 * * * * * ")
    @Scheduled(fixedDelay = 20000,initialDelay = 2000)
    public void test(){
        try {
            logger.info(" first start");

            TimeUnit.SECONDS.sleep(10);
            logger.info(" first end");

        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}