调用微信接口返回openid

private String getOpenId(String code){
        String url = "https://api.weixin.qq.com/sns/jscode2session";
        HashMap map = new HashMap();
        map.put("appid", appId);
        map.put("secret", appSecret);
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        // http请求
        String response = HttpUtil.post(url, map);
        // 返回响应转json,通过key获取value
        JSONObject jsonObject = JSONUtil.parseObj(response);
        String openid = jsonObject.getStr("openid");
        if(ValidateUtil.isEmpty(openid)){
            throw new RuntimeException("临时登陆凭证错误");
        }
        return openid;
    }

if (!bool) {
            //把当前用户绑定到ROOT帐户
            String openId = getOpenId(code);
            HashMap param = new HashMap();
            param.put("openId", openId);
            param.put("nickname", nickname);
            param.put("photo", photo);
            param.put("role", "[0]");
            param.put("status", 1);
            param.put("createTime", new Date());
            param.put("root", true);
            userDao.insert(param);
            int id = userDao.searchIdByOpenId(openId);
            return id;
        }

　　map作为参数非常灵活，value可以是多种类型