springboot 异步任务

总结：异步任务怎样快速实现呢 当然可以自己搞个线程池然后submit，spring4  里面提供一个注解 @Async 默认是 一个可缓存的线程池，最好是还是自己定义一个线程池大小，注意用注解 必须是能代理的，不然不会生效。

使用如下：开启异步  注意了：必须对象必须是能被代理的 不然重试 和 异步 都不会生效

 

1.开启注解

@SpringBootApplication
@EnableSwagger2
@EnableRetry   //开启重试机制
@EnableAsync //开启异步
public class DemoApplication {

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


}

　　

2.定义线程池

@Bean("taskExecutor")
    public Executor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setThreadNamePrefix(threadNamePrefix);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }


    @Bean("taskExecutor1")
    public Executor asyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(7);
        executor.setMaxPoolSize(42);
        executor.setQueueCapacity(11);
        executor.setThreadNamePrefix("MyExecutor-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

　　3.使用

  

@Async("taskExecutor")
    public void sendSms() throws InterruptedException {
        log.info("开始做任务2：发送短信");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        log.info("完成任务1，耗时：" + (end - start) + "毫秒");
    }

    @Async("taskExecutor1")
    public void send() throws InterruptedException {
        log.info("hello：发送短信");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        log.info("hello：" + (end - start) + "毫秒");
    }

　　4.测试

  private @Autowired
    AsyncTask asyncTask;

    @Test
    public void test() throws InterruptedException {
        asyncTask.sendSms();
      //  asyncTask.send();
        Thread.sleep(100000);
    }