CloseableHttpClient：连接永远挂起答案

【问题标题】：CloseableHttpClient: connection hangs foreverCloseableHttpClient：连接永远挂起
【发布时间】：2018-02-14 10:40:04
【问题描述】：

我遇到了由 CloseableHttpClient 管理的连接问题。 Spring 服务管理任何连接：

@Service
public class MyService {
...
    private CloseableHttpClient closeableHttpClient;

    public String setPayment() {
...
        try {
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader(ACCEPT, APP_JSON);
            httpPost.setHeader(CONTENT_TYPE, APP_JSON);
            StringEntity entity = new StringEntity(request, CHARSET);
            httpPost.setEntity(entity);
            CloseableHttpResponse response = closeableHttpClient.execute(httpPost);
            logger.info("Execution");
        } catch (IOException e) {
            logger.error("Error");
        }
    }
}

当执行不成功时，我的 setPayment 方法最多被调用 3 次。有时在第一次执行后，我的方法挂起而没有响应。欢迎提出任何建议。

【问题讨论】：

标签： httpclient

【解决方案1】：

我建议您执行以下操作：

1) 在构造函数中设置超时：

public MyService() {
        int timeout = 180;      
        RequestConfig config = RequestConfig.custom()
                .setConnectTimeout(timeout * 1000)
                .setConnectionRequestTimeout(timeout * 1000)
                .setSocketTimeout(timeout * 1000).build();
        closeableHttpClient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
    }

2) 使用 try-with-resources 来管理 CloseableHttpResponse

    public String setPayment() {
    ...

                HttpPost httpPost = new HttpPost(url);
                httpPost.setHeader(ACCEPT, APP_JSON);
                httpPost.setHeader(CONTENT_TYPE, APP_JSON);
                StringEntity entity = new StringEntity(request, CHARSET);
                httpPost.setEntity(entity);
try (CloseableHttpResponse response = closeableHttpClient.execute(httpPost)){                
                logger.info("Execution");
            } catch (IOException e) {
                logger.error("Error");
            }
        }

【讨论】：