Question

我有一些代码如下：

public class HttpUtil {
    public static String sendGetRequest(String url) {
        String result = null;

        try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
            HttpGet httpget = new HttpGet(url);
            CloseableHttpResponse response = httpclient.execute(httpget);

            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }        
}

我想知道连接是长连接，因为当我使用sendGetRequest时在HTTP 1.1中使用keepalive。我想在Java中使用长连接。

Answer 1

默认Connection keep alive strategy可以无限期保持生存状态

如果响应中不存在Keep-Alive标头，则HttpClient会假定连接可以无限期保持活动状态。

要自定义CloseableHttpClient的保持活动策略，请使用setKeepAliveStrategy：

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

在closeablehttpclient中使用keepalive

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