struts2的拦截器配置详解

public class AuthorityInterceptor extends MethodFilterInterceptor{

@Override
public String doIntercept(ActionInvocation invocation) throws Exception {
// TODO Auto-generated method stub
invocation.getAction().toString();
ActionContext actionContext = invocation.getInvocationContext();
Map session = actionContext.getSession();
User user =  (User)session.get("user");
if(user==null)
{
return "login";
}else
{
System.out.println("这是拦截前======");
String result = invocation.invoke();
System.out.println(result);
System.out.println("这是拦截后======");
return result;
}
}

}

<package name="system" extends="struts-default" namespace="/system">
<!-- 配置拦截器 -->
<interceptors>
<!-- 配置自定义拦截器 -->
<interceptor name="authorityinterceptor" class="com.softfz.interceptor.AuthorityInterceptor">
<!-- 配置该拦截器不拦截的action方法名，即黑名单-->
<param name="excludeMethods">login</param>
<!-- 配置该拦截器拦截的action方法名，即白名单
<param name="includeMethods">XXX,XX</param>
-->
</interceptor>
<!-- 配置自定义拦截器栈，注意自定义拦截器一定要包含【defaultStack】
拦截器的执行顺序：如果有拦截器a,b,c，则执行顺序为a-b-c-action-c-b-a
-->
<interceptor-stack name="mystack">
<interceptor-ref name="authorityinterceptor"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
<!-- 配置默认拦截器
1.覆盖了在struts-default中的默认拦截器栈配置
2.即所有action都会先被默认拦截器所拦截
-->
<default-interceptor-ref name="mystack" ></default-interceptor-ref>
<action name="user" class="com.softfz.system.action.UserAction">
<result name="success">/welcome.jsp</result>
<result name="login">/login.jsp</result>
<result name="addBefore">/user_add.jsp</result>
<!-- 可以单独为某个action配置拦截器
<interceptor-ref name=""></interceptor-ref>
-->
</action>
</package>