我在Java 8中使用了以下代码，它确实工作。我能够将批处理作业从28分钟缩短到3:39分钟。

I used the following code in Java 8 and it did the work. I was able to reduce the batch job to run from 28 minutes to 3:39 minutes.

IntStream.range(0, 100000).parallel().forEach(i->{
     restTemplate.exchange(url, HttpMethod.GET, request, String.class);
}
});