Springboot整合异步任务

Springboot异步执行使用场景

• 发送短信
• 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

Springboot异步执行程序

•  使用注解@EnableAsync开启异步，会自动扫描
• 定义@Component @Async作为组件被容器扫描执行

@SpringBootApplication
//扫描 mybatis mapper 包路径
@MapperScan(basePackages = "com.imooc.mapper")
//扫描 所有需要的包, 包含一些自用的工具类包 所在的路径
@ComponentScan(basePackages= {"com.imooc", "org.n3r.idworker"})
//开启定时任务
@EnableScheduling
//开启异步调用方法
@EnableAsync
public class ImoocApplication {

	public static void main(String[] args) {
		SpringApplication.run(ImoocApplication.class, args);
	}
}

@Component
public class AsyncTask {
	
	@Async
    public Future<Boolean> doTask11() 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> doTask22() 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> doTask33() 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); 
    }
}

@RestController
@RequestMapping("tasks")
public class DoTask {
	
	@Autowired
    private AsyncTask asyncTask;
	
    @RequestMapping("test1")
    public String test1() throws Exception {
    	
    	long start = System.currentTimeMillis();
    	
    	Future<Boolean> a = asyncTask.doTask11();
    	Future<Boolean> b = asyncTask.doTask22();
    	Future<Boolean> c = asyncTask.doTask33();
    	
    	while (!a.isDone() || !b.isDone() || !c.isDone()) {
    		if (a.isDone() && b.isDone() && c.isDone()) {
    			break;
    		}
    	}
    	
    	long end = System.currentTimeMillis();
    	
    	String times = "任务全部完成，总耗时：" + (end - start) + "毫秒";
    	System.out.println(times);
    	
    	return times;
    }
}

用时1008ms，说明几个任务异步执行