在 JSF2.0 中动态创建和填充 DataTable [英] Creating and populating a DataTable dynamically in JSF2.0

问题描述

我有一个小问题.当我想在 JSF 中填充 DataTable 时，我必须先创建一个模型，然后在我的视图中使用它.就像 Primefaces 示例 这里.

I've a little problem right there. When I want to populate DataTable in JSF I have to create a model first, then use it in my view. Like on Primefaces sample here.

现在，我必须创建 DataTable 来显示来自网络服务的数据.我不知道会有多少列，我也不知道它们的名字......你能推荐一些明智的解决方案吗?

And now, I have to create DataTable that will display data, that came from webservice. I don't know how many columns there will be, and I don't know their names... Could you recommend some wise solution ?

附注.我也不知道如何从 webservice 返回数据 - 它仍然有待确定.

PS. I don't know also how to returned data from webservice - it is still to determine.

编辑

public Bean() {
    columns = new ArrayList<String>();  
    rows = new ArrayList<Map<String, Object>>();         
    populateColumns(columns,4);   

    for(int i = 0 ; i < 6 ; i++)  
    {               
        Map<String,Object> m = new HashMap<String,Object>();
        m.clear();          
        for(int j = 0 ; j < 4 ; j++)  
        {
            m.put("Column" + j, "sth" + j + i);
        }                                               
        rows.add(m);
    }       
}

private void populateColumns(List<String> list, int size) {  
    for(int i = 0 ; i < size ; i++)  
        list.add("Column" + i);
}  

推荐答案

在一个List>中收集数据，代表rows财产.Map 代表列，以列名称为键(如有必要，只需自动生成，例如 column1、column2、column3 等通过 "column" + i).将这些列名称收集在单独的 List 中，代表 columns 属性.最后用表示如下:

Collect the data in a List<Map<String, Object>> which represents the rows property. The Map represents the columns, keyed by a column name (if necessary, just autogenerated such as column1, column2, column3, etc by "column" + i). Collect those column names in a separate List<String> which represents the columns property. Finally show it as follows by <p:columns>:

<p:dataTable value="#{bean.rows}" var="row">
    <p:columns value="#{bean.columns}" var="column">
        #{row[column]}
    </p:columns>
</p:dataTable>

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