Java CloseableHttpClient和CloseableHttpResponse是否都需要显式关闭

我有以下方法，它发出

HTTP

POST

请求

它返回一个

CloseableHttpResponse

，因此任何调用它的代码都可以获得状态代码、响应正文等

我试图理解，这两种情况：

• CloseableHttpClient客户端

• CloseableHttpResponse可关闭httpresponse

需要关门吗？还是关闭一个，关闭另一个

..
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.impl.client.CloseableHttpClient;

public static CloseableHttpResponse post(final String restEndpoint, final String data, final Header[] headers) throws Exception {
    final URIBuilder uriBuilder = new URIBuilder(restEndpoint);
    final HttpPost httpPost = new HttpPost(uriBuilder.build());
    httpPost.setHeader("Accept", "application/json");
    httpPost.setHeader("Cache-Control", "no-cache, no-store");

    if (data != null) {
        httpPost.setEntity(new StringEntity(data));
    }

    if (headers != null) {
        for (Header header : headers) {
            httpPost.setHeader(header);
        }
    }

    final CloseableHttpClient client = HttpClients.custom()
            .setSSLSocketFactory(createSSLFactory())
            .setSSLHostnameVerifier(new NoopHostnameVerifier())
            .build();

    final CloseableHttpResponse closeableHttpResponse = client.execute(httpPost);
    final int statusCode = closeableHttpResponse.getStatusLine().getStatusCode();
    logger.debug(Optional.empty(), statusCode, httpPost.toString());

    return closeableHttpResponse;
}

我认为每个请求都需要手动关闭

CloseableHttpResponse

有几种方法可以做到这一点

使用try/catch/finally块：

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import java.io.IOException;

public class CloseableHttpClientWithTryCatchFinally {

    public static void main(String... args) throws Exception {

        URIBuilder uriBuilder = new URIBuilder("https://www.google.com/");

        HttpGet httpGet = new HttpGet(uriBuilder.build());

        CloseableHttpClient client = HttpClients.custom().build();

        CloseableHttpResponse response = null;

        try {
            response = client.execute(httpGet);

            response.getEntity().writeTo(System.out);

        } catch (IOException e) {

            System.out.println("Exception: " + e);
            e.printStackTrace();

        } finally {

            if (response != null) {
                response.close();
            }
        }
    }
}

我认为更好的答案是使用：

一般来说，我看到人们只是为他们的应用程序创建一个

CloseableHttpClient

，然后在整个应用程序中重用该实例。如果您只打算反复使用一个或几个实例，那么不，我认为您不应该关闭它们。但是，如果要反复创建

CloseableHttpClient

的新实例，则需要关闭它们

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import java.io.IOException;

public class CloseableHttpClientTryWithResources {

    public static void main(String... args) throws Exception {

        URIBuilder uriBuilder = new URIBuilder("https://www.google.com/");

        HttpGet httpGet = new HttpGet(uriBuilder.build());

        CloseableHttpClient client = HttpClients.custom().build();

        try (CloseableHttpResponse response = client.execute(httpGet)) {

            response.getEntity().writeTo(System.out);

        } catch (IOException e) {

            System.out.println("Exception: " + e);
            e.printStackTrace();
        }
    }
}