使用线程池的异步编排合并多个接口的查询数据返回给前端页面

使用线程池的异步编排合并多个接口的查询数据返回给前端页面

```java
 //创建一个线程池
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 20, 1L, TimeUnit.SECONDS, new linkedBlockingDeque<>(50), Executors.defaultThreadFactory(), new ThreadPoolExecutor.AbortPolicy());
        CompletableFuture futureImg = CompletableFuture.supplyAsync(() -> {
            System.out.println("查询商品的图片信息");
            return "hello.jpg";
        },threadPoolExecutor);
        CompletableFuture futureAttr = CompletableFuture.supplyAsync(() -> {
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("查询商品的属性");
            return "黑色+256G";
        },threadPoolExecutor);
        CompletableFuture futureDesc = CompletableFuture.supplyAsync(() -> {
            System.out.println("查询商品介绍");
            return "华为";
        },threadPoolExecutor);
        CompletableFuture allOf = CompletableFuture.allOf(futureImg, futureAttr, futureDesc);
        allOf.join();//等待所有结果完成
        System.out.println("main....end..."+futureImg.get()+"=>"+futureAttr.get()+"=>"+futureDesc.get());