fix bug about changing admin email or phonenumber online #88
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spring 的默认bean作用范围是singleton。下面这两个类以spring的bean注入的方式加载bean。单实例,使得在线变更邮箱和电话号码时,不能在线更新实例变量的值。因此,没法做到在线更新邮箱和手机号后,能立即生效。