如何在jsf中显示hashmap值？ [英] How to show hashmap values in jsf?

问题描述

我有beanMyBean，它具有属性HashMap - map，其值类型是MyClass。我想使用ui在jsf中显示地图的一些属性：repeat。
但这些代码：

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>

但是这段代码没有显示任何内容。尽管当我尝试以这种方式在jsp中显示hashmap值时，它是成功的。我错在哪里？如何解决这个问题？

But this code didn't show anything. Though when I try to show hashmap values in jsp this way, it was succesfull. Where I am wrong? And how fix that?

推荐答案

从文档为 repeat 值属性：

该标记迭代的项目集合的名称。该集合可以是 List ，数组， java.sql.ResultSet ，或者是一个单独的java 对象。如果collection为null，那么这个标签什么都不做。

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.

所以，var被设置为 HashMap ，并且EL尝试在其上查找关键字value。您需要将您的输入集公开为 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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