步驟，如圖所示

1.新增定時任務1業務類

package top.ytheng.demo.task;

import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

//定時任務業務類
@Component
public class TestTask {

    //兩秒執行一次
    @Scheduled(fixedRate=2000)
    public void sum() {
        System.out.println(
 
"當前時間:" + new Date());
    }
}

2.新增啟動類

package top.ytheng.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication 
 
//等於下面3個
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
//攔截器用到
@ServletComponentScan
//MyBatis用到
@MapperScan("top.ytheng.demo.mapper")
//定時使用(開啟定時任務)
@EnableScheduling
public class DemoApplication {

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

3.右鍵專案Run As啟動，檢視列印日誌即可