SpringBoot 异步

1. 在程序入口加入开启异步标签

@EnableAsync

2. 在需要执行异步的类中加入标签（工具类）

package com.example.utils;

import java.util.concurrent.Future;

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;

@Component
public class AsyncUtil {
	
	@Async
	public Future<Boolean> doAsync1() throws Exception{
		long start = System.currentTimeMillis();
		Thread.sleep(1000);
		long end = System.currentTimeMillis();
		System.out.println("任务1耗时："+ (end - start) + "毫秒");
		return new AsyncResult<>(true);
	}
	
	@Async
	public Future<Boolean> doAsync2() throws Exception{
		long start = System.currentTimeMillis();
		Thread.sleep(700);
		long end = System.currentTimeMillis();
		System.out.println("任务2耗时："+ (end - start) + "毫秒");
		return new AsyncResult<>(true);
	}
	
	@Async
	public Future<Boolean> doAsync3() throws Exception{
		long start = System.currentTimeMillis();
		Thread.sleep(600);
		long end = System.currentTimeMillis();
		System.out.println("任务3耗时："+ (end - start) + "毫秒");
		return new AsyncResult<>(true);
	}

}

3.测试

package com.example.controller;

import java.util.concurrent.Future;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.domain.model.UserInfo;
import com.example.domain.service.IUserInfoService;
import com.example.utils.AsyncUtil;

@RestController
@RequestMapping("/welcome")
public class WelcomeController {

	@Autowired
	private IUserInfoService iUserInfoService;
	
	@Autowired
	private AsyncUtil asyncUtil;
	
	@RequestMapping("/user")
	public String user() throws Exception {
		
		long start = System.currentTimeMillis();
		
		Future<Boolean> a = asyncUtil.doAsync1();
		Future<Boolean> b = asyncUtil.doAsync2();
		Future<Boolean> c = asyncUtil.doAsync3();
		
		while(!a.isDone() || !b.isDone() || !c.isDone()) {
			if(a.isDone() && b.isDone() && c.isDone()) {
				break;
			}
		}
		
		long end = System.currentTimeMillis();
		System.out.println("任务全部完成。总耗时："+ (end - start) + "毫秒！");
		
		UserInfo user = iUserInfoService.getUserById(917);
		return user.getUserNickName();
	}
}

4.输出结果

任务3耗时：600毫秒
任务2耗时：700毫秒
任务1耗时：1000毫秒
任务全部完成。总耗时：1018毫秒！

如果去掉标签输出结果为

任务1耗时：1000毫秒
任务2耗时：700毫秒
任务3耗时：600毫秒
任务全部完成。总耗时：2301毫秒！

5.使用场景

大部分会应用于

发送短信息，发送邮件， App消息推送，节省运维凌晨发布任务时间，提供效率

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