解决struts2 拦截器修改request的parameters参数失败的问题

<? xml version = "1.0" encoding = "UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

< struts >

    <!-- 配置一系列常量，非必须 -->

    < constant name = "struts.i18n.encoding" value = "UTF-8" />

    <!-- constant name="struts.devMode" value="true"/ -->

    < constant name = "struts.enable.DynamicMethodInvocation" value = "false" />

    < constant name = "struts.objectFactory.spring.autoWire" value = "auto" ></ constant >

    < constant name = "struts.multipart.saveDir" value = "/tmp" />

    < package name = "default" namespace = "/"

        extends = "struts-default, json-default" >

        <!-- 配置拦截器 -->

        < interceptors >

            <!-- 定义xss拦截器 -->

            < interceptor name = "xssInterceptor" class = "xx.xx.xx(此处填写拦截器对应的类)" ></ interceptor >

            <!-- 定义一个包含xss拦截的拦截栈 -->

            < interceptor-stack name = "myDefault" >

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

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

            </ interceptor-stack >

        </ interceptors >

        <!-- 这个必须配置，否则拦截器不生效 -->

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

    </ package >

</ struts >    

< interceptor-stack name = "myDefault" >

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

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

</ interceptor-stack >

<!-- 修改prepareInterceptor的alwaysInvokePrepare属性值为false -->

      < interceptors >

        < interceptor-stack name = "atzhu" >//自定义的拦截器栈名。

            < interceptor-ref name = "paramsPrepareParamsStack" >

              < param name = "prepare.alwaysInvokePrepare" >false</ param >

            </ interceptor-ref >

        </ interceptor-stack >

      </ interceptors >

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