并行与并发场景下，异步执行是不可少的。这里来看一下在springboot中如何使用注解的方式执行异步任务？
首先创建一个springboot项目，在主函数类上加入@EnableAsync注解开启异步功能，如下所示:
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| @SpringBootApplication
@EnableAsync
public class SpringbootAcTaskApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootAcTaskApplication.class, args);
}
}
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然后创建一个类，用@Async注解标明一个异步方法即可，如下所示：
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| @Component
class AsyncRun {
@Async
void async() {
System.out.println("async running");
}
@Async
Future<String> asyncFuture() {
System.out.println("async-future running");
return new AsyncResult<>("async-future run");
}
}
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下面是一个用来调用异步方法的测试类：
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| @Component
public class AsyncDemo implements CommandLineRunner {
@Resource
private AsyncRun asyncRun;
@Override
public void run(String... args) throws Exception {
System.out.println("begin");
asyncRun.async();
Future<String> future = asyncRun.asyncFuture();
System.out.println("end");
System.out.println(future.get(1, TimeUnit.SECONDS));
}
}
|