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1、主程序添加 @EnableAsync 开启异步

package com.example;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.scheduling.annotation.EnableAsync;@EnableAsync@SpringBootApplicationpublic class SpringbootDemoApplication {
   	public static void main(String[] args) {
   		SpringApplication.run(SpringbootDemoApplication.class, args);	}}

2、在方法上添加 @Async

package com.example.service;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Service;@Servicepublic class TestService {
   		/*	 * 异步	 */	@Async	public void test(){
   		try {
   			Thread.sleep(3000);		} catch (InterruptedException e) {
   			// TODO Auto-generated catch block			e.printStackTrace();		}		System.out.println("hello");	}}

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