用户名密码登录判断

if(!StringUtils.isEmpty(username) && !StringUtils.isEmpty(password)) {

        User user = UserMapper.getUserByUsername(username);

        if(user != null && user.getPassword().equals(password)) {

            //登录成功

            return new Results(200,"");

        }

    }

    //登录失败

    return new Results(404,"");