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

Linux的系自2.4.版本之后采用了Netfilter机制，它是在中扩展各种网络服务的结构化底层框架。

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.

现了协同网络税务办公系，给出了使用JAVA语言的工作流的现，包括工作流的口类、主要类的现以及工作流引擎的现，并在该工作流基础上，现了该系的公文流转、审批流程设置等主要办公业务。