springboot 使用@Async注解实现异步多线程

1、在启动类中添加注解

@SpringBootApplication
@EnableAsync
//@ImportResource(locations = {"classpath:spring/my.xml"})
public class DemoApplication {

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

}

 2、写异步调用的类和方法

@Service
@Slf4j
public class UserService {
    @Async
    public Future<Integer> sum(Integer a, Integer b){
        log.info("sum thread:"+Thread.currentThread().getName());
        return new AsyncResult(a+b);
    }
    @Async
    public Future<Integer> count(Integer a,Integer b){
       log.info("count thread:"+Thread.currentThread().getName());
        return new AsyncResult(a+b);
    }
}

 3、异步调用

 @RequestMapping("/show")
    public String show() {
//调用
        Future<Integer> sum = userService.sum(10, 10);
        Future<Integer> count = userService.count(20, 20);
        List<Future> result = new ArrayList<>();
 //保存返回
        result.add(sum);
        result.add(count);
//获取返回值
        Integer totleSum = null;
        try {
            totleSum = (Integer) result.get(0).get();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }

        Integer totleCount = null;
        try {
            totleCount = (Integer) result.get(1).get();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }

        return "env:sum="+totleSum+",count="+totleCount;
    }