CODEWITHSUNDEEP
javafreemarker
mushui
mushui

Reputation: 41

How can I use Freemarker to show the List<Map<String,Object>> data?

I put two Map objects in an ArrayList, and I want to show the different data based on the index of the arraylist, the java code is as follows:

List<Map<String, Object>> value = new ArrayList<Map<String, Object>>();
value.add(originalUnitProps);
value.add(nowUnitProps);

And the following is my template file:

<#list value as ori>
    <#if ori_index == 0>

        original info：<br/>

        <#list ori?keys as key>
            ${key}:${ori[key]}  <br/>
        </#list>
    <#else>
        <br/>
        now info：<br/>
        <#list ori?keys as key>
            ${key}:${ori[key]}  <br/>
        </#list>
    </#if>
</#list>

But it causes an exception:

java.lang.IllegalArgumentException: freemarker.template.DefaultObjectWrapper could not convert java.util.ArrayList to a TemplateHashModel.

Upvotes: 0

Views: 6356

Answers (2)

Charles Forsythe
Charles Forsythe

Reputation: 1861

I was able to get this to run successfully, setting up the model with this code:

Map<String, Object> originalUnitProps = new HashMap<>();
originalUnitProps.put("Lang1", Locale.FRENCH);
originalUnitProps.put("Lang2", Locale.CANADA_FRENCH);

Map<String, Object> nowUnitProps = new HashMap<>();
nowUnitProps.put("Lang3", Locale.ENGLISH);
nowUnitProps.put("Lang4", Locale.GERMAN);

List<Map<String, Object>> value = new ArrayList<Map<String, Object>>();
value.add(originalUnitProps);
value.add(nowUnitProps);

model.put("value", value);

Upvotes: 0

ddekany
ddekany

Reputation: 31122

The problem has nothing to do with your template. Apparently, you have passed value to FreeMarker as the data-model, but the data-model must be a Map<String, ...> or a TemplateHashModel. So create a Map<String, Object> dataModel, put that ArrayList into that with a meaningful name, something like dataModel.put("infos", value), pass the dataModel to FreeMarker instead of value, and then in the template use <#list infos as ...>.

Also, if you have an error message, next time attach the whole stack trace.

Upvotes: 3

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