170719springboot编程之异步调用@Async

Posted 2020-10-04 目标奔雷手

1、在pom.xml中增加依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

2、在主类上开启注解

package com.rick;

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

@SpringBootApplication
@EnableAsync
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

3、新建任务测试类

package com.rick.task;

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

import java.util.Random;
import java.util.concurrent.Future;

/**
 * Desc :  任务类
 * User : RICK
 * Time : 2017/8/29 9:56
  */

@Component
public class Task1 {

    public Random random = new Random();

    /**
     * Desc :  @Async所修饰的函数不要定义为static类型，否则异步调用不会生效
     *  这里通过返回Future<T>来返回异步调用的结果，实现异步回调
     * User : RICK
     * Time : 2017/8/29 10:30
      */

    //任务一
    @Async
    public Future<String> doTaskOne() throws Exception{
        System.out.println("开始做任务一");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务一，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("test1 is done!");
    }

    //任务二;
    @Async
    public Future<String> doTaskTwo() throws Exception {
        System.out.println("开始做任务二");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务二，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("test2 is done!");
    }

    //任务3;
    @Async
    public Future<String> doTaskThree() throws Exception {
        System.out.println("开始做任务三");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务三，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("test3 is done!");
    }


}

4、创建测试控制器

package com.rick.controller;

import com.rick.task.Task1;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.Future;

@RestController
public class TaskController {

    @Autowired
    private Task1 task1;

    @RequestMapping("/task1")
    public String task1() throws  Exception{
        Future<String> test1 = task1.doTaskOne();
        Future<String> test2 = task1.doTaskTwo();
        Future<String> test3 = task1.doTaskThree();

        while (true){
            if(test1.isDone()){
                System.out.println("====================test1 is done=========================");
            }

            if(test2.isDone()){
                System.out.println("====================test2 is done=========================");
            }

            if(test3.isDone()){
                System.out.println("====================test3 is done=========================");
            }

            if(test1.isDone() && test2.isDone() && test3.isDone()){
                break;
            }
            Thread.sleep(1000);
        }

        return "task1";
    }



}

5、启动项目测试http://localhost:8080/task1

项目代码：https://github.com/zrbfree/spring-boot-async.git