170719、springboot编程之异步调用@Async

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