多线程Future 有结果返回并发

@Resource(name = "httpTaskExecutor")
private ThreadPoolTaskExecutor taskExecutor;

CountDownLatch countDownLatch = new CountDownLatch(5);
Future<String> request3 = taskExecutor.submit(() -> {
    String respon = "";
    try {
        String urs = url;
        respon = restUtil.execute(param,urs,HttpMethod.GET);
    }catch (Exception e){
        e.printStackTrace();
    }
    countDownLatch.countDown();
    return respon;
});

countDownLatch.await();