我怎么知道`org.apache.http.client`是否使用Java NIO，如果这对我来说有利于改为NIO？

Question

我有这段代码：

import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import com.google.inject.Inject;


public class GenericHttpClient implements IGenericHttpClient {

    private CloseableHttpClient client;

    @Inject
    @Singleton
    public GenericHttpClient() {
//        client = HttpClientBuilder.createForBl()
//                .setConnectionTimeToLive(1, TimeUnit.MINUTES)
//                .build();


        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectionRequestTimeout(20 * 1000)
                .build();
        client = HttpClientBuilder
                .create()
                .setDefaultRequestConfig(requestConfig)
                .build();


    }

    @Override
    public String sendHttpGetRequest(String url) {
//        Constants.CONFIG_QUERY_URL
        String answer = null;
        try {
            CloseableHttpResponse response = client.execute(new HttpGet(url));
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                answer = EntityUtils.toString(response.getEntity());
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
        return answer;
    }
}

我怎么知道org.apache.http.client是否在其API下使用Java NIO或NIO.2？我可以使用另一个库来实现NIO吗？

此外，我对网络的所有工作都是GET并返回一个带有响应的对象作为对象成员之一。

因此，在NIO之后我的帖子将被Future.get()阻止。我不确定我当时是在保存任何资源。

//Send the message

Future<Integer> successfullyWritten=  asynchronousSocketChannel.write(helloBuffer);

//Do some stuff here. The point here is that asynchronousSocketChannel.write() 
//returns almost immediately, not waiting to actually finish writing 
//the hello to the channel before returning control to the currently executing thread

doSomethingElse();

//now you can come back and check if it was all written (or not)

System.out.println("Bytes written "+successfullyWritten.get());