方法非常简单，我们只需要在@Async注解中指定线程池名即可
@Service
public class GitHubLookupService {
    private static final Logger logger =LoggerFactory.getLogger(GitHubLookupService.class);
    @Autowired
    private RestTemplate restTemplate;
    // 这里进行标注为异步任务，在执行此方法的时候，会单独开启线程来执行(并指定线程池的名字)
    @Async("taskExecutor")
     public CompletableFuture<String> findUser(String user) throws InterruptedException {
        logger.info("Looking up " + user);
        String url = String.format("https://api.github.com/users/%s", user);
        String results = restTemplate.getForObject(url, String.class);
        Thread.sleep(3000L);
        return CompletableFuture.completedFuture(results);
    }
}