ie8 ie浏览器下载excel文件乱码，变成压缩包，解决方案

我的页面

<div id="page-content">
    <div>下载<a  id="download" href="javascript:void(-1)">咨询电话接听明细模板</a>，填写后导入</div>
    <input type="file" name="file_upload" id="file_upload"/>
</div>

js代码

  $("#download").click(function(){

                window.open( window.location.protocol+"//"+window.location.host+"/resourcemngctrl/pages/taxservhotline_eva/detail.xlsx", "_blank");

            });

web.xml

<mime-mapping>
		<extension>xlsx</extension>
		<mime-type>application/msexcel</mime-type>
	</mime-mapping>