java 获取微信公众号粉丝的openId

public static String getUserOpenId(String accessToken){String result = null;String requestUrl ="https://api.weixin.qq.com/cgi-bin/user/get?access_token=ACCESS_TOKEN";requestUrl = requestUrl.replace("ACCESS_TOKEN", accessToken);JSONObject jsonObject = WeixinUtil.httpRequest(requestUrl, "GET", null);if(null != jsonObject){System.out.println(jsonObject);System.out.println(jsonObject.get("total"));System.out.println(jsonObject.get("data"));result = jsonObject.get("data")+"";}return result;}