如何在 jsf 中显示 hashmap 值?

How to show hashmap values in jsf?(如何在 jsf 中显示 hashmap 值?)

问题描述

我有 bean MyBean"，它有属性 HashMap - map"，它的值类型是 MyClass.我想使用 ui:repeat 在 jsf 中显示地图的一些属性.但是这些代码:

I have bean "MyBean", which has property HashMap - "map" which values type is MyClass. I want to show some properties of map in jsf using ui:repeat. But these code:

<ui:repeat  var="var"  value="#{mybean.map}" >
<tr> 
<td> <h:outputText value="#{var.value.property1}"></h:outputText> </td>
<td><h:outputText value="#{var.value.property2}"></h:outputText></td>
</tr>
</ui:repeat>

来自repeat 值属性的 pdldocs/facelets/ui/repeat.html">文档:

From the documentation for the repeat value attribute:

此标记迭代的项目集合的名称.集合可以是 List、数组、java.sql.ResultSet 或单独的 java Object.如果集合为空，则此标签不执行任何操作.

The name of a collection of items that this tag iterates over. The collection may be a List, array, java.sql.ResultSet, or an individual java Object. If the collection is null, this tag does nothing.

因此，var 被设置为您的 HashMap 并且 EL 尝试在其上查找键 "value".您需要将您的条目集公开为 List.

So, var is set as your HashMap and EL tries to look up the key "value" on it. You will need to expose your entry set as a List.

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