这是IM和文件分享软件工作的原理– 系统总是保存着包含着IP地址信息的用户列表。
This is how instant messengers or file sharing programs work - the system keeps a list of users with their IP addresses.
本文阐述了以下基本原理：如何创建、保存并读取简单的bean。
I've covered the basics: how to create a simple bean, save it, and read it back out.
其原理是生成映象文件保存到一个隐含分区，以达到保护数据的目的。
The principle is that the system creates a mapping file and preserves it on a hidden hard disk partition so as to protect the data.
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