Spring 简单定时任务

spring框架

1，定时任务

@Component
public class HelloTask {
    @Scheduled(cron = "0/5 * * * * *")
    public void sayHello(){
        String helloStr="hello ";
        System.out.println(helloStr);
    }
}

2，配置spring配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans.xsd 
       http://www.springframework.org/schema/task 
       http://www.springframework.org/schema/task/spring-task.xsd 
       http://www.springframework.org/schema/context 
       https://www.springframework.org/schema/context/spring-context.xsd">
    <!--配置扫描注解的路径-->
    <context:component-scan base-package="com.company.task"/>
   <!-- 方式一：-->
    <task:annotation-driven scheduler="scheduler" mode="proxy"/>
    <task:scheduler id="scheduler" pool-size="10"/>
    <!--方式二：-->
    <task:executor id="executor" pool-size="5" />
    <task:scheduler id="scheduler" pool-size="10" />
    <task:annotation-driven executor="executor" scheduler="scheduler" />

</beans>

3，在main方法中加载配置文件

public class App {

    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        System.out.println("Hello World!");
    }
}

springboot框架

1，定时任务

@Component
public class HelloTask {
    @Scheduled(cron = "0/5 * * * * *")
    public void sayHello(){
        String helloStr="hello ";
        System.out.println(helloStr);
    }
}

2，启动程序上添加注解@EnableScheduling

@SpringBootApplication
@EnableScheduling
public class SpringbootScheduleApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootScheduleApplication.class, args);
    }
}

注意：定时任务的方法只能为无参数的方法。