XWork是一个标准的Command模式实现，并且完全从web层脱离出来。Xwork提供了很多核心功能：前端拦截机（interceptor），运行时表单属性验证，类型转换，强大的表达式语言（OGNL - the Object Graph Navigation Language），IoC（Inversion of Control倒置控制）
==================================================================== * The OpenSymphony Software License, Version 1.1 * * (this license is derived and fully compatible with the Apache Software * License - see http://www.apache.org/LICENSE.txt) * * C
