springboot异步任务、定时任务

打开浏览器 http://localhost:8080/hello   ，连续刷新可以看到不会 等待 3秒时间了，pom.xml controller service 代码如下。

-----------Springboot04TaskApplication.java:-----------

@EnableAsync //开启异步注解功能
@EnableScheduling //开启基于注解的定时任务
@SpringBootApplication
public class Springboot04TaskApplication {

   public static void main(String[] args) {
      SpringApplication.run(Springboot04TaskApplication.class, args);
   }

}

-----------AsyncService.java:-----------

@Service
public class AsyncService {

    //告诉spring这是一个异步方法
    @Async
    public void hello(){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("处理数据中...");
    }
}

-----------ScheduledService.java-----------

@Service
public class ScheduledService {

    /**
     * second , minute,hour,day of month,month,and day of week.
     * 0 * * * * MON-FRI
     *
     * */
    //@Scheduled(cron = "0 * * * * MON-FRI")
    //@Scheduled(cron = "0,1,2,3,4,5 * * * * MON-FRI")
    //Scheduled(cron = "0-5 * * * * MON-FRI")
    @Scheduled(cron = "0/4 * * * * MON-FRI") //每4秒执行一次
    public void helllo(){
        System.out.println("hello...");
    }
}
-----------AsyncController.java-------------------

@RestController
public class AsyncController {

    @Autowired
    AsyncService asyncService;

    @GetMapping("/hello")
    public String hello(){
        asyncService.hello();
        return "success";
    }
}
----------------------pom.xml----------------------

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.2.1.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.自定义</groupId>
   <artifactId>springboot-04-task</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>springboot-04-task</name>
   <description>Demo project for Spring Boot</description>

   <properties>
      <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>
         <exclusions>
            <exclusion>
               <groupId>org.junit.vintage</groupId>
               <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
   </dependencies>

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

</project>