public String getContent(String url, int timeOut) {        HttpClientBuilder httpBuilder = HttpClientBuilder.create();        if (timeOut > 0) {            RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeOut).setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();            httpBuilder.setDefaultRequestConfig(requestConfig);        }         CloseableHttpClient closeableHttp = httpBuilder.build();        HttpGet request = new HttpGet(url);        CloseableHttpResponse response = null;        try {            response = closeableHttp.execute(request);             HttpEntity entity = response.getEntity();             return entity == null ? null : EntityUtils.toString(entity, CharacterSet.UTF8);        } catch (Exception e) {            e.printStackTrace();            return null;        } finally {            try {                if (request != null) {                    request.abort();                }                 if (response != null) {                    response.close();                }                 closeableHttp.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }

   EntityUtils.consume(entity);

response.close();

在HttpClient 4.0+的版本，正确的关闭连接如下：

在HttpClient 3.0+版本中，正确的关闭如下：