struts2-登陆以及藏静态资源到/WEB-INF

登陆：
dao: criteria.add(Restrictions.eq("name"， name));
service:
User u = dao.get(user.getName)
if(u==null)
抛出不存在用户名异常
if(!user.getPwd.eq(u.getPwd))
抛出不存在密码异常
return u;
interceptors:
1.自定拦截器LoginInterceptor extends MethodFilterInterceptor
2.return "toLogin"；
action:
User u = service.get(user);
return "toindex"//重定向避免表单重复提交..
struts.xml:

1. <interceptors>
   <interceptor name="loginInterceptor" class> </interceptor>
   < interceptor-stack name="myStack">
   <interceptor-ref name="loginInterceptor" >
   <param name="excludeMethods">login, regist</param>
   </interceptor-ref>
   <interceptor-ref name="defaultStack"></interceptor-ref>
   </interceptor-stack>
   </interceptors>
   <def-interceptor-ref name=""></def-interceptor-ref>
2. <gloabl-result>
   <result name="toLogin"></result>
   </gloabl-result>
   3.<gloabl-exception-mappings>
   <exception-mapping result="error" class="java.lang.RunntimeException">
   </exception-mapping>
   </gloabl-exception-mappings>
   <action name="UserAction_*" method={1} class="...">
   <result name="toindex" type="redirectAction">page_index</result>
   <result name="error">/login.jsp</result>
   </action>
   4.隐藏静态资源至WEB-INF中： <action name="page_*">
   <result >/WEB-INF/page_{1}</result>
   </action>
   页面需从valueStack中接收exception.message：
   <s:property value="exception.message">