----------------用list传参数--------------
String urls="";
HttpPost httpPost = new HttpPost(urls);
httpPost.setHeader("Content-type","application/x-msdownload;charset=utf-8");
List<NameValuePair> list = new ArrayList<>();
list.add(new BasicNameValuePair("username","123"));
list.add(new BasicNameValuePair("password","456"));
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, Consts.UTF_8);
httpPost.setEntity(urlEncodedFormEntity);
-------------------------------------------------传json,与外部系统对接时这种方式比较多。-----------------------------------------