首先,我的代码:
报告布局.xhtml:
<ui:define name="content">
<h:panelGroup id="reporte-viewer" layout="block" >
<p:media value="#{reportBean.file}" player="pdf" width="500px" height="400px">
NO SUPP!!!
</p:media>
</h:panelGroup>
</ui:define>
索引.xhtml:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
..............
template="/WEB-INF/template/layouts/report-layout.xhtml">
<ui:param name="reportBean" value="#{myBean}" />
</ui:composition>
我用 ViewScoped 和 SessionScoped 测试了 MyBean,当我使用 getValue 时,下一个代码返回 null:
PrimeResourceHandler.java:
String dynamicContentEL = (String) session.get(dynamicContentId); //read: "#{reportBean.file}" replacing with "#{myBean.file}" works.
ELContext eLContext = context.getELContext(); //OK
ValueExpression ve = context.getApplication().getExpressionFactory().createValueExpression(eLContext, dynamicContentEL, StreamedContent.class); //Apparently OK
streamedContent = (StreamedContent) ve.getValue(eLContext); //return null
为什么当我像 param getValue return null 这样传递 MyBean 时,JSF 解析“#{reportBean.file}”没有问题,但之前的代码不起作用。