Java 如何在Freemarker中迭代地图中的嵌套集合？

我想迭代Freemarker 2.3.15中地图中的嵌套集合

我将以下内容传递给视图：

Map<ApplicationPropertyDefinition, Collection<ApplicationProperty>> = getValues();

---

如何正确迭代嵌套集合，以便访问每个ApplicationProperty对象中的字符串值“name”？

您可以尝试添加一个方法，该方法将

ApplicationPropertyDefinition

作为参数，并返回为该参数找到的集合

public Collection<ApplicationProperty> getPropertiesForDefinition(ApplicationPropertyDefinition definition) {
    return propertiesByDefinition.get(definition)
}

公共集合getPropertiesForDefinition（ApplicationPropertyDefinition定义）{
返回propertiesByDefinition.get（定义）
}

这将导致：

<#list propertiesByDefinition?keys as definition>
    <strong>${definition.externalReference!''}</strong>

    <#list getPropertiesByDefinition(definition) as value>
        ${value.name}
    </#list>
</#list>

${definition.externalReference！'}
${value.name}

您必须为给定的

定义检索
集合
对象

试试这个：

<#if propertiesByDefinition?size gt 0>
    <#list propertiesByDefinition?keys as definition >
        <strong>${definition.externalReference!''}</strong>

        <#list propertiesByDefinition.get(definition) as value>
            ${value.name}
        </#list>

    </#list>
</#if>

<#list propertiesByDefinition?keys as definition>
    <strong>${definition.externalReference!''}</strong>

    <#list getPropertiesByDefinition(definition) as value>
        ${value.name}
    </#list>
</#list>

<#if propertiesByDefinition?size gt 0>
    <#list propertiesByDefinition?keys as definition >
        <strong>${definition.externalReference!''}</strong>

        <#list propertiesByDefinition.get(definition) as value>
            ${value.name}
        </#list>

    </#list>
</#if>

<#if propertiesByDefinition?has_content >
    <#list propertiesByDefinition as definition, collection >
        <strong>${definition.externalReference!''}</strong>

        <#list collection as value >
            ${value.name}
        </#list>

    </#list>
</#if>

<#list map as key, value>
    ${key} : ${value}
</#list>