struts2+拦截器

1，定义一个拦截器类继承 AbstractInterceptor  或者 MethodFilterInterceptor
2.在struts.xml里面定义如下

  <interceptors>

    <interceptor name="encodingInterceptor"class="sy.interceptor.EncodingInterceptor">

    <interceptor-stack name="encodingStack">

    <interceptor-ref name="defaultStack"></interceptor>

  <interceptor-ref name="encodingInterceptor"></interceptor>

    </interceptor-stack>

</interceptor>

</interceptors>

<default-interceptor-ref name="encodingStack"></default-interceptor-ref>