public static String postJosn(String url, String jsonString) throws Exception {

         SSLContext sslContext = SSLContexts.custom().useTLS().build();

         SSLConnectionSocketFactory f = new SSLConnectionSocketFactory(sslContext, new String[] { "TLSv1.2" }, null,

                 null);

         CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(f).build();

         // 设置请求超时时间 15秒

         //client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 15000);

         HttpPost myPost = new HttpPost(url);

         myPost.setHeader(HTTP.CONTENT_TYPE, "application/json;charset=utf-8");

         myPost.setHeader("charset", "utf-8");

         StringEntity s = new StringEntity(jsonString, "utf-8");

         s.setContentEncoding("UTF-8");

         s.setContentType("application/json;charset=utf-8");

         myPost.addHeader("Content-Type", "application/json;charset=utf-8");

         myPost.setEntity(s);

         HttpResponse res = client.execute(myPost);

         HttpEntity entity = res.getEntity();

         //myPost.releaseConnection();

         log.info(EntityUtils.toString(entity, "utf-8"));;

         return EntityUtils.toString(entity, "utf-8");

     }