// 身份验证方法
    public static CheckRes check () throws UnsupportedEncodingException {
　　　　　// 转为 UTF-8格式:案例　
        String req = "ec_name="+ URLEncoder.encode(ec_name, "UTF-8") +"&user_name="+user_name+"&user_passwd="+user_passwd ;
        System.out.println("传入参数:"+req);
        HttpRequest httpRequest = new HttpRequest() ;
        String checkStr = httpRequest.sendPost(checkUrl,req) ;   //返回验证信息的 回参
        System.out.println("验证身份结果："+checkStr);
        CheckRes checkRes = JSONUtils.json2pojo(checkStr,CheckRes.class);
        String mas_user_id = checkRes.getMas_user_id() ;
        System.out.println("mas_user_id："+mas_user_id);
        return checkRes ;
    }