使用HTTPclient保持长连接

HttpPost httpPost = new HttpPost("xxxxx");
httpPost.addHeader("Connection", "keep-alive");
CloseableHttpClient httpClient = null;
for(int i =0 ;i<5000;i++){
    long t1 = System.currentTimeMillis();
	CloseableHttpResponse response = httpClient.execute(httpPost);
	long t2 = System.currentTimeMillis();
}

for (int i = 0; i<5000;i++){
     long t1 = System.currentTimeMillis();
      CloseableHttpResponse response = httpClient.execute(httpPost);
      if(null != response.getEntity()){
           EntityUtils.consume(response.getEntity());
      }
      long t2 = System.currentTimeMillis();
 }

ConnectionKeepAliveStrategy keepAliveStrategy = new ConnectionKeepAliveStrategy() {
            @Override
            public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
                HeaderElementIterator it = new BasicHeaderElementIterator(response.headerIterator(HTTP.CONN_KEEP_ALIVE));
                while (it.hasNext()) {
                    HeaderElement he = it.nextElement();
                    String param = he.getName();
                    String value = he.getValue();
                    if (value != null && param.equalsIgnoreCase("timeout")) {
                        try {
                            return Long.parseLong(value) * 1000;
                        }
                        catch (NumberFormatException ignore) {
                        }
                    }
                }
                HttpHost target = (HttpHost) context.getAttribute(HttpClientContext.HTTP_TARGET_HOST);
                if ("bizapi.jd.com ".equalsIgnoreCase(target.getHostName())) {
                    return 60 * 1000;
                }
                else {
                    return 300 * 1000;
                }
   CloseableHttpClient httpClient = httpClientBuilder.setConnectionManager(pollingConnectionManager)
                .setKeepAliveStrategy(keepAliveStrategy).setDefaultRequestConfig(defaultRequestConfig).build();