SpringCloud（第 047 篇）註解式Async配置異步任務

時間 2019-11-06

標籤 springcloud 註解 async 配置異步任務简体版

原文原文鏈接

SpringCloud（第 047 篇）註解式Async配置異步任務

1、大體介紹

一、有時候咱們在處理一些任務的時候，須要開啓線程去異步去處理，原有邏輯繼續往下執行；
二、當遇到這種場景的時候，線程是能夠將咱們完成，而後在SpringCloud中也有這樣的註解來支撐異步任務處理；

2、實現步驟

2.1 添加 maven 引用包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

	<artifactId>springms-async</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
	
    <parent>
        <groupId>com.springms.cloud</groupId>
        <artifactId>springms-spring-cloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
	
	<dependencies>
        <!-- web模塊 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

</project>

2.2 添加應用配置文件（springms-async\src\main\resources\application.yml）

server:
  port: 8345
spring:
  application:
    name: springms-async  #所有小寫

2.3 添加異步任務類（springms-async\src\main\java\com\springms\cloud\task\AsyncTasks.java）

package com.springms.cloud.task;

import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;

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

/**
 * Async實現異步調用。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@Component
public class AsyncTasks {

    public static Random random = new Random();

    @Async
    public Future<String> doTaskOne() throws Exception {
        System.out.println("Async, taskOne, Start...");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskOne, End, 耗時: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskOne Finished");
    }

    @Async
    public Future<String> doTaskTwo() throws Exception {
        System.out.println("Async, taskTwo, Start");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskTwo, End, 耗時: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskTwo Finished");
    }

    @Async
    public Future<String> doTaskThree() throws Exception {
        System.out.println("Async, taskThree, Start");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(5000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskThree, End, 耗時: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskThree Finished");
    }
}

2.4 添加異步任務Web控制器（springms-async\src\main\java\com\springms\cloud\controller\AsyncTaskController.java）

package com.springms.cloud.controller;

import com.springms.cloud.task.AsyncTasks;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.Future;

/**
 * 測試異步任務Web控制器。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@RestController
public class AsyncTaskController {

    @Autowired
    AsyncTasks asyncTasks;

    /**
     * 測試異步任務。
     *
     * @return
     * @throws Exception
     */
    @GetMapping("/task")
    public String task() throws Exception {
        long start = System.currentTimeMillis();

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

        while(true) {
            if(task1.isDone() && task2.isDone() && task3.isDone()) {
                // 三個任務都調用完成，退出循環等待
                break;
            }
            Thread.sleep(1000);
        }

        long end = System.currentTimeMillis();

        String result = "任務所有完成，總耗時：" + (end - start) + "毫秒";
        return result;
    }
}

2.5 添加微服務啓動類（springms-schedule\src\main\java\com\springms\cloud\MsScheduleApplication.java）

package com.springms.cloud;

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

/**
 * 註解式Async配置異步任務；
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@SpringBootApplication
@EnableAsync
public class MsAsyncApplication {

	public static void main(String[] args) {
		SpringApplication.run(MsAsyncApplication.class, args);
		System.out.println("【【【【【【 Async異步任務微服務 】】】】】】已啓動.");
	}
}

3、測試

/****************************************************************************************
 1、簡單用戶連接Mysql數據庫微服務（Async實現異步調用）：

 一、添加註解 EnableAsync、Async 以及任務類上註解 Component ；
 二、啓動 springms-async 模塊服務，啓動1個端口；
 三、而後在瀏覽器輸入地址 http://localhost:8345/task 而後等待大約10多秒後，成功打印全部信息，一切正常；

 總結：說明 Async 異步任務配置生效了；
 ****************************************************************************************/