1、添加命名空间和xsd约束

xmlns:task="http://www.springframework.org/schema/task" 

http://www.springframework.org/schema/task  
http://www.springframework.org/schema/task/spring-task-3.2.xsd

2、在 application.xml文件中开启注解

<task:annotation-driven />

3、配置扫描任务扫描包

<context:component-scan base-package="com.task" />

4、demo

@Component
public class AutoScanTask {
    @Scheduled(cron = "0/5 * * * * ? ") // 间隔5秒执行
    public void autoScan() {
        System.out.println("定时器执行");
    }
}