FreeMarker通用的分页

<#--  
自定义指令genPagin的参数说明，如下  
url           必填。用于指定链接所跳转的URL  
totalPages    必填。用于指定总页数  
currPage      选填。用于指定当前显示第几页，默认显示第一页  
showPageNum   选填。用于指定所显示页链接的数量，默认显示10个页链接。否则总不能把所有页的链接都显示出来吧  
class         选填。用于指定<a/>的class属性  
-->  
<#macro genPagin url totalPages currPage=1 showPageNum=10 class="">  
    <#local halfPage = (showPageNum/2)?int/>  
    <#if (halfPage>=currPage)>  
        <@showPage start=1 end=currPage currPage=currPage url=url class=class/>  
        <@showPage start=currPage+1 end=showPageNum currPage=currPage url=url class=class/>  
    <#else>  
        <@showPage start=currPage-halfPage+1 end=currPage currPage=currPage url=url class=class/>  
        <#if (currPage+halfPage>totalPages)>  
            <#local endPage=totalPages/>  
        <#else>  
            <#local endPage=currPage+halfPage/>  
        </#if>  
        <@showPage start=currPage+1 end=endPage currPage=currPage url=url class=class/>  
    </#if>  
</#macro>  
  
<#macro showPage start end currPage url class>  
    <#list start..end as page>  
        <#-- 当前页则不显示链接 -->  
        <#if currPage==page>  
            [${page}]  
        <#else>