传入json字符串的post请求

/**
* 传入json字符串的post请求
* @Title: getRequsetData 
* @Description: TODO
* @param @param url
* @param @param json {"refund_fee":"1","total_fee":"1","out_trade_no":"20180319184601983860"}
* @param @return
* @param @throws Exception 设定文件 
* @return JSONObject 返回类型 
* @throws
*/
public static JSONObject getRequsetData(String url,String json) throws Exception{
System.out.println("-----------传入json：---------------------------"+json);
HttpPost httpPost = new HttpPost(url);
HttpClient httpClient = HttpClients.createDefault();
StringEntity postEntity = new StringEntity(json, "UTF-8");
httpPost.addHeader("Content-Type", "application/json");
httpPost.setEntity(postEntity);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String b = EntityUtils.toString(httpEntity, "UTF-8");
System.out.println("-----------返回值：---------------------------"+b);
JSONObject JS = JSONObject.fromObject(b);
return JS ;
}