Jsf 如何在p:commandButton中存储值？

我想将p:commandButton上显示的值存储在支持bean中的变量中。这是我的命令按钮

<p:commandButton value="#{rec.UTILITY_BILL_UPLOAD}" actionListener="#{pavReqAssign.DownloadFile}" onclick="PrimeFaces.monitorDownload(start, stop);" icon="ui-icon-arrowthick-1-s" >
<p:fileDownload value="#{pavReqAssign.file}" />
</p:commandButton>

---

尝试此操作，假设属性

fileNameDL

在托管bean

pavReqAssign

中声明：

<p:commandButton value="#{rec.UTILITY_BILL_UPLOAD}" actionListener="#{pavReqAssign.DownloadFile}" onclick="PrimeFaces.monitorDownload(start, stop);" icon="ui-icon-arrowthick-1-s" >
    <f:setPropertyActionListener target="#{pavReqAssign.fileNameDL}" value="#{rec.UTILITY_BILL_UPLOAD}" />
    <p:fileDownload value="#{pavReqAssign.file}" />
</p:commandButton>

@kocko是的，正是这样，还有bean中“DownloadFile”函数的执行。谢谢你，奥马尔。没问题。

<p:commandButton value="#{rec.UTILITY_BILL_UPLOAD}" actionListener="#{pavReqAssign.DownloadFile}" onclick="PrimeFaces.monitorDownload(start, stop);" icon="ui-icon-arrowthick-1-s" >
    <f:setPropertyActionListener target="#{pavReqAssign.fileNameDL}" value="#{rec.UTILITY_BILL_UPLOAD}" />
    <p:fileDownload value="#{pavReqAssign.file}" />
</p:commandButton>