Workflow realization base on JAVA was given, including kenel interface, main classes and workflow engine.File flow, examine and approve flow function of the system were realized based on the workflow.

实现协同网络税务办公系统，使用JAVA语言的工作的实现，包括工作的核心接口、主要的实现以及工作引擎的实现，并在该工作上，实现该系统的公文转、审批程设置等主要办公业务。

Linux system kenel adopts the Netfilter mechanism ,which is a structural bottom frame for expanding various network service after 2.4 version.

Linux的系统内核自2.4.版本之后采用Netfilter机制，它是在内核中扩展各种网络服务的结构化底层框架。