springboot任务之异步任务

1-新建工程,只选web模块

2-新增service包,AsyncService类

package com.example.springboottask.service;

import org.springframework.stereotype.Service;

@Service
public class AsyncService {
    
    public void hello(){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("处理数据中....");
    }
}

3-新建controller包,AsyncController类

package com.example.springboottask.controller;

import com.example.springboottask.service.AsyncService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AsyncController {
    
    @Autowired
    AsyncService asyncService;
    
    @GetMapping("/hello")
    public String hello(){
        asyncService.hello();
        return "success";
    }
}

4-访问http://localhost:8080/hello,响应3秒之后出现页面

5-要使这个任务是异步的,需要

5-1给service添加@Async注解

package com.example.springboottask.service;

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

@Service
public class AsyncService {

    //告诉spring这是一个异步方法
    @Async
    public void hello(){
        try {

5-2给启动类添加@EnableAsync注解

package com.example.springboottask;

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

@EnableAsync   //开启异步注解功能
@SpringBootApplication
public class SpringbootTaskApplication {

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

}

6-运行

此时立即响应,无需等待三秒