public static String post(String url, String params){
log.info("post url:" + url + " params:" + params);
String responseStr = "";
try(CloseableHttpClient httpClient = HttpClients.createDefault()) {
HttpPost httpPost = new HttpPost(url);
StringEntity stringEntity = new StringEntity(params, Charset.forName("UTF-8"));
httpPost.setHeader("Content-type", "application/json");
httpPost.setEntity(stringEntity);
Closeable
