是否需要显式关闭CloseableHttpClient和CloseableHttpResponse？
是否需要显式关闭CloseableHttpClient和CloseableHttpResponse？
提问于 2019-09-23 21:23:18
我有以下方法，它发出一个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、响应体等。
我试着去理解，这两个：
CloseableHttpClient clientCloseableHttpResponse closeableHttpResponse
需要关闭吗？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;
}回答 1
Stack Overflow用户
回答已采纳
发布于 2019-09-23 22:14:06
我认为CloseableHttpResponse需要手动关闭每个单独的请求。
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尝试-with-resources语句
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();
}
}
}通常，我看到人们只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。如果你只会一次又一次地使用一个或几个实例，那么不，我认为你不应该关闭它们。但是，如果要一次又一次地创建CloseableHttpClient的新实例，则需要关闭它们。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58070374
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