Spring Boot使用@Async实现异步调用

原文：http://blog.csdn.net/a286352250/article/details/53157822

项目GitHub地址 ：

https://github.com/FrameReserve/TrainingBoot

Spring Boot（十）使用@Async实现异步调用 ，标记地址：

https://github.com/FrameReserve/TrainingBoot/releases/tag/0.0.10

Spring Boot启动类，增加@EnableAsync注解配置：

src/main/java/com/training/SpringBootServlet.java

package com.training;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.scheduling.annotation.EnableAsync;

@SpringBootApplication
@EnableAsync
public class SpringBootServlet extends SpringBootServletInitializer {

    // jar启动
    public static void main(String[] args) {
        SpringApplication.run(SpringBootServlet.class, args);
    }

    // tomcat war启动
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringBootServlet.class);
    }

}

测试：

增加异步方法Service，线程休眠：

package com.training.async.service.impl;

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

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

import com.training.async.service.DemoAsyncService;

@Service
public class DemoAsyncServiceImpl implements DemoAsyncService {

    public static Random random =new Random();

    @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<>("任务一完成");
    }

    @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<>("任务二完成");
    }

    @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<>("任务三完成");
    }

}

调用异步测试测试，查看控制台输出执行顺序：

package com.training.async.controller;

import io.swagger.annotations.ApiOperation;

import java.util.concurrent.Future;

import javax.annotation.Resource;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.training.async.service.DemoAsyncService;
import com.training.core.dto.ResultDataDto;

@RestController
@RequestMapping(value="/async")
public class DemoAsyncController {

    @Resource
    private DemoAsyncService demoAsyncService;

    /**
     * 测试异步方法调用顺序
     */
    @ApiOperation(value="测试异步方法调用顺序", notes="getEntityById")
    @RequestMapping(value = "/getTestDemoAsync", method = RequestMethod.GET)
    public @ResponseBody ResultDataDto getEntityById() throws Exception {

        long start = System.currentTimeMillis();

        Future<String> task1 = demoAsyncService.doTaskOne();
        Future<String> task2 = demoAsyncService.doTaskTwo();
        Future<String> task3 = demoAsyncService.doTaskThree();

        while(true) {
            if(task1.isDone() && task2.isDone() && task3.isDone()) {
                // 三个任务都调用完成，退出循环等待
                break;
            }
            Thread.sleep(1000);
        }

        long end = System.currentTimeMillis();

        System.out.println("任务全部完成，总耗时：" + (end - start) + "毫秒");
        return ResultDataDto.addSuccess();
    }
}