Java 调用 webservice 接口，为什么这么慢

Java 调用 webservice 接口，为什么这么慢，有没有好的优化方案，本人目前改成 http 方式发 soap 消息调用，速度依旧很慢，维持在平均 100ms 下不来。 之前用 cxf 的 JaxWsDynamicClientFactory 速度更加慢，400ms 、500ms 都出现过。

这是现在使用 httpClient 的调用代码

public static String callWebSV(String urlWsdl,String soap,String soapAction){ String result=null; try { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpPost httpPost = new HttpPost(urlWsdl); httpPost.setHeader("Content-Type", "text/xml;charset="); httpPost.setHeader("SOAPAction", soapAction); InputStreamEntity entity = new InputStreamEntity(new ByteArrayInputStream(soap.getBytes())); httpPost.setEntity(entity); CloseableHttpResponse respOnse= httpClient.execute( httpPost); if (response.getStatusLine().getStatusCode() == org.apache.http.HttpStatus.SC_OK) { HttpEntity respOnseEntity= response.getEntity(); String back = EntityUtils.toString(responseEntity); //log.info("httpClient 返回 soap：" + back); result=parseResult(back); log.info("httpClient 返回结果：" + result); } else { log.error("HttpClinet 返回状态码：" + response.getStatusLine().getStatusCode()); } } catch (Exception e) { log.error("调用错误：",e); } return result; }