在Service类声明一个注解@Async作为异步方法的标识

package com.qf.sping09test.service;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class AsyncService {

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


}

controller

package com.qf.sping09test.controller;

import com.qf.sping09test.service.AsyncService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AsyncController {

    @Autowired
    AsyncService asyncService;

    @RequestMapping("/hello")
    public String hello(){
          asyncService.hello();//停止三秒，转圈
          return "ok";
    }


}

主启动类需要加一个注解

package com.qf.sping09test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;

@SpringBootApplication
@EnableAsync
public class Sping09TestApplication {

    public static void main(String[] args) {
        SpringApplication.run(Sping09TestApplication.class, args);
    }

}