绑定春天启用Velocity模板内的变量集合 [英] Binding a variable collection inside a Spring enabled Velocity template

问题描述

假如我有一个速度1.5模板下面的表单支持对象：

Suppose I have the following form backing object for a Velocity 1.5 template:

public class Bucket {

    String data1;
    String data2;
    String data3;
    String data4;

    // getters setters blah blah...
}

我想这四个属性的字符串绑定到字符串以下的java.util.Map，里面四个引入下来单一选择控件：

I'd like to bind these four String attributes to the following java.util.Map of Strings, inside four drop down single select controls:

"a" : "1"
"b" : "2"
"c" : "3"
"d" : "4"

如果我的网页的控制器模型里面，我命名为支持对象boData，和值映射labelKeys，速度可以绑定的支持对象的属性对我来说：

If inside my page's controller Model, I name the backing object "boData", and the value map "labelKeys", velocity can bind the backing object's properties for me:

#springFormSingleSelect( "boData.data1" $labelKeys "")
#springFormSingleSelect( "boData.data2" $labelKeys "")
#springFormSingleSelect( "boData.data3" $labelKeys "")
#springFormSingleSelect( "boData.data4" $labelKeys "")

但是，有没有办法来避免调用#springFormSingleSelect四次？我的意思是，这里有一个模式，但我看不到的方式来恩preSS它Velocity的条款。

However, is there a way to avoid invoking #springFormSingleSelect four times? I mean, there's a pattern here, but I can't see the way to express it in Velocity's terms.

如果举例来说，我反而确定这四个String类桶内属性作为Java数组或者java.util.List的，我怎么能告诉速度，我需要它来绑定一个下拉单中选择控制每个元素列表中？

If for example, I defined instead these four String attributes inside class Bucket as a Java array, or a java.util.List, how could I tell velocity that I need it to bind a drop down single select control for each element in the List?

public class Bucket {
    List<String> dataItems = new ArrayList<String>();
    // getter, setter...
}

我感谢你，你可以提供任何见解！

I thank you for any insight you could provide!

推荐答案

如何

#foreach($i in [1..4])
    #set($field = "boData.data" + $i)
    #springFormSingleSelect($field $labelKeys "")
#end

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