如何动态地从 *.properties 文件填充 h:selectItems

发布于 2024-12-13 05:30:39 字数 369 浏览 0 评论 0原文

如果我有这样的代码：

<rich:select enableManualInput="true" defaultLabel="Select time spent">

       <f:selectItems value="" />

</rich:select>

和一个属性文件，例如：

key1=val1
key2=val2
key3=val3
key4=val4

问题是如何从属性文件中获取所有值并从中创建一个 ArrayList 以便我可以使用它们在下拉列表中？

原文

If I have this peace of code:

<rich:select enableManualInput="true" defaultLabel="Select time spent">

       <f:selectItems value="" />

</rich:select>

and a properties file like:

key1=val1
key2=val2
key3=val3
key4=val4

The question is how to take all the values from the properties file and make a ArrayList<SelectItems> from them for example so I can use them in the drop-down list?

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秋心╮凉 2024-12-20 05:30:39

如果您可以更改属性文件的布局，我建议像

key1=val1
key2=val2
key3=val3
key4=val4

属性教程一样存储它： http://download.oracle.com/javase/tutorial/essential/environment/properties.html

API：http://download.oracle.com/javase/6/docs /api/java/util/Properties.html。

public ArrayList<SelectItem> propertiesToSelectItemList(final Properties props)
    {
        final ArrayList<SelectItem> result = new ArrayList<SelectItem>();
        for(Map.Entry<Object, Object> me : props.entrySet())
        {
            result.add(new SelectItem((String)me.getKey(), (String)me.getValue()));
        }
        return result;
    }

不幸的是，属性由 Hashtable

If you can change the layout of your properties file i would suggest storing it like

key1=val1
key2=val2
key3=val3
key4=val4

Properties Tutorial: http://download.oracle.com/javase/tutorial/essential/environment/properties.html

Api: http://download.oracle.com/javase/6/docs/api/java/util/Properties.html.

public ArrayList<SelectItem> propertiesToSelectItemList(final Properties props)
    {
        final ArrayList<SelectItem> result = new ArrayList<SelectItem>();
        for(Map.Entry<Object, Object> me : props.entrySet())
        {
            result.add(new SelectItem((String)me.getKey(), (String)me.getValue()));
        }
        return result;
    }

Unfortunately Properties is backed by a Hashtable<Object,Object>. But unless you mess with it, the casts should be safe.

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