strus2 自定义 intercept 时 对象为null 解救方案
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>

<include file="conf/struts/struts_demo.xml"></include>
<package name="zskx-demo-mytest" abstract="ture" extends="struts-default,json-default">


<interceptors>
<interceptor name="permissioninterceptor" />

<!-- 全局转向 -->

<global-results>
<result name="input">/WEB-INF/pages/hello.jsp</result>
<result name="login">/WEB-INF/pages/login.vm</result>
</global-results>
<!-- 全局转向 -->


</package>

<constant name="struts.velocity.toolboxlocation" value="WEB-INF/toolbox.xml" />
</struts>