如何将地图列表传递给GSP页面视图并对其进行迭代

问题描述

假设我们想要显示关于文件夹文件的信息。我们必须将每个文件的信息保存在一个Map中。然后，将这些地图添加到列表中。

控制器操作：

  
通过地图中的每个，您可以访问键和 value ，因此只需迭代该值即可。
 < g：每个in =$ {filesOfFolderData} VAR = 文件 > 
  ... 
< / g：每个> 
< / g：每个> 
  
 
Let's say we want to show information about the files of a folder. We have to save the information of each file in a Map. Then, add these Maps to a List. 
Controller action:
def show() {

    List results = new ArrayList();

    File dir = getDir(params.id);

    if (dir.exists()) {
        dir.eachFile {

        Map fileInformation= new java.util.LinkedHashMap()

        fileInformation.put("name", it.getName());
        fileInformation.put("size", it.length());
        fileInformation.put("path", it.getAbsolutePath() );

        results.add(fileInformation);

        }
    }

    [filesOfFolderData: result]
}
Maybe, this is my best attempt to get the data in the view (I followed the approach of here with no luck):
<g:each in="${filesOfFolderData}">

    <p> it: ${it}</p>
    <p> it.properties: ${it.properties} </p>

    <g:each var="propertyEntry" in="${it.properties}">

        <p> propertyEntry.key: ${propertyEntry.key} </p>
        <p> propertyEntry.value: ${propertyEntry.value} </p>
        <p> propertyEntry.value.name: ${propertyEntry.value} </p>

    </g:each>

</g:each>
This is what the Internet Browser shows (note: the first line of the result could be a little bit different as I simplify the code so I guest that result in base of the real result of my case):
it: [{name=wololo1, size=35, path=c:\}, {name=wololo2, size=35, path=c:\}]

it.properties: {class=class java.util.ArrayList, empty=false}

propertyEntry.key: class

propertyEntry.value: class java.util.ArrayList

propertyEntry.value.name: class java.util.ArrayList

propertyEntry.key: empty

propertyEntry.value: false

propertyEntry.value.name: false
How could we iterate over the List?
 解决方案 
With each in maps you have access to the key and value, so just iterate over the value.
<g:each in="${filesOfFolderData}" var="files">
  <g:each in="${files.value}" var="file">
    ...
  </g:each>
</g:each>
                        
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