项目中有一个功能，是使用定时任务采集数据，在使用优雅关机功能时会出现数据源早于线程池中的线程关闭，从而导致 Caused by: com.alibaba.druid.pool.DataSourceClosedException: dataSource already closed at Tue Mar 01 12:19:07 CST 2022 错误，尝试以下方式可以解决上述问题，其逻辑是在监听到程序关闭事件时首先阻塞关闭连接池 shutdown() 。

@Slf4j
@Component
public class ApplicationEventListener implements ApplicationListener<ApplicationEvent> {

    @Resource
    private ThreadPoolTaskExecutor collectThreadPoolExecutor;

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ContextClosedEvent) {
            log.info("collectThreadPoolExecutor.shutdown().......");
            collectThreadPoolExecutor.shutdown();
        }
    }
}