解决struts2下载文件时中文文件名乱码

<action name="simpledownload" class="action.SimpleDownLoadAction">    <param name="filePath">/upload</param>    <result type="stream">        <!--Mime类型-->        <param name="contentType">${contentType}</param>        <!--最终下载的文件名，fileName从action中获取-->        <param name="contentDisposition">attachment;filename=${fileName}</param>        <!--输入流-->        <param name="inputName">downloadFile</param>        <!--解决中文文件名乱码-->        <param name="encode">true</param>    </result></action>