如何在速度模板中迭代嵌套地图?

Question

如何在速度模板中迭代嵌套地图？ 我有

HashMap<String, HashMap<String, HashMap<String, List<MealPlanGroup>>>> termPlans=new HashMap<String, HashMap<String, HashMap<String, List<MealPlanGroup>>>>(); 

这张地图我用 Java 填充数据并渲染到 HTML 页面，但无法在 HTML 页面上迭代

Answer 1

鉴于您将这个可怕的变量绑定到模板中的termPlans变量，您可以执行以下操作：

#foreach( $level1 in $termPlans )
<!-- Iterating over the values of the first Map level -->
#foreach( $level2 in $level1 )
<!-- Iterating over the values of the second Map level -->
#foreach( $list in $level2 )
<!-- Iterating over the values of the third Map level -->
#foreach( $mealPlanGroup in $list )
<!-- Iterating over the values of the List -->
$mealPlanGroup.id <br/>
#end
#end
#end
#end

这将仅使用映射值，并且会忽略它们的键。如果您还需要密钥，可以尝试遍历entrySet()：

#foreach( $level1Entry in $termPlans.entrySet() )
<!-- Iterating over the values of the first Map level -->
Level 1 key is $level1Entry.getKey()
#foreach( $level2Entry in $level1Entry.getValue().entrySet() )
Level 2 key is $level2Entry.getKey()
<!-- Iterating over the values of the second Map level -->
#foreach( $level3Entry in $level2Entry.getValue().entrySet() )
Level 3 key is $level3Entry.getKey()
<!-- Iterating over the values of the third Map level -->
#foreach( $mealPlanGroup in $level3Entry.getValue() )
<!-- Iterating over the values of the List -->
$mealPlanGroup.id <br/>
#end
#end
#end
#end