springboot实现异步调用

介绍

所谓的异步执行其实就是使用多线程的方式实现异步调用。

启用异步

需要在应用入口类上添加：@EnableAsync

@EnableAsync
@SpringBootApplication
@IntegrationComponentScan("com.ztjy")
public class MyApplication {
    public static void main(String[] args) {
            SpringApplication.run(MyApplication.class, args);
   }

定义一个线程池

@Configuration
public class AsyncTaskPoolConfig {

    @Bean(name = "taskExecutor")
    public Executor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(10);
        executor.setMaxPoolSize(200);
        executor.setQueueCapacity(50);
        executor.setKeepAliveSeconds(60);
        executor.setThreadNamePrefix("taskExecutor-ws-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}

编写异步请求

在异步执行的方法上添加注解：@Async

Component
@Log4j2
public class AsyncTask {

    //这里注入的是dubbo的服务，和异步请求没有多大关系
    @Reference(check = false)
    private AuthorFacade authorFacade;

      /**
     * 获取作者信息
     *
     * @param authorId 作者ID
     * @return 作者信息
     */
    @Async
    public Future<AuthorDTO> getAuthor(String authorId){
        try {
            System.out.println("执行线程的名字："+Thread.currentThread().getName());
            return new AsyncResult<AuthorDTO>(authorFacade.getAuthor(authorId));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}

在service里调用异步执行的方法

/**
     * 异步调用获取文章信息
     *
     * @param articleId 文章ID
     * @return 文章信息
     */
    @Override
    public Map getArticleDetailAsync(String articleId){
        //同步调用获取文章信息
        ArticleDTO articleDTO = articleFacade.getArticle(articleId);
        //异步调用获取作者信息
        Future<AuthorDTO> authorFuture = asyncTask.getAuthor(articleDTO.getAuthorId());

        Map<String,Object> map=new HashMap<>(10);
        map.put("article",articleDTO);
        try{
            map.put("author",authorFuture.get());
        }catch (Exception e){
            log.error(e.getMessage());
        }
        return map;
    }

来源：https://www.cnblogs.com/wangsen/p/11656683.html