Java 将列表传递给freemarker

Java文件

for(..){
 java.util.List opslist = new ArrayList();
 opr.setOperationName(operation.getName()); //gets operation name (iterate and get n no of names) sets it to opr
 System.out.println(opr.getOperationName());//gets all the set values n prints it(jus to chack that all values r getting set)
 opslist.add(opr.getOperationName());//putting those valies into a list
 datamodel.put("opslist", opslist.toArray(new String[]{}));//putting it into a hash map with key as opslist and value as opslist object
}           

<#list opslist as x> //read the values from the key "opslist" (gets only one value)
 ${x} //print values one by one(it prints only one value) </#list>

自由标记模板

for(..){
 java.util.List opslist = new ArrayList();
 opr.setOperationName(operation.getName()); //gets operation name (iterate and get n no of names) sets it to opr
 System.out.println(opr.getOperationName());//gets all the set values n prints it(jus to chack that all values r getting set)
 opslist.add(opr.getOperationName());//putting those valies into a list
 datamodel.put("opslist", opslist.toArray(new String[]{}));//putting it into a hash map with key as opslist and value as opslist object
}           

<#list opslist as x> //read the values from the key "opslist" (gets only one value)
 ${x} //print values one by one(it prints only one value) </#list>

自由市场模板的输出为

usage

为什么只打印最后一个值？

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有人能告诉我在freemarker模板中的正确方法吗？

看起来您正在为列表中的每个元素创建一个新的opslist。这样，只将最后一个元素传递给freemarker。

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只需将列表opslist=newarraylist（）；在for循环前面

这是因为在for循环的每次迭代中都要创建一个新列表。另外，在DataModelMap中，您正在为同一个键添加4个列表。应纠正如下：

    java.util.List opslist = new ArrayList();

    for(..){
        opr.setOperationName(operation.getName()); //gets operation name (iterate and get n no of names) sets it to opr

        System.out.println(opr.getOperationName());//gets all the set values n prints it(jus to chack that all values r getting set)

        opslist.add(opr.getOperationName());//putting those valies into a list
    }     

    datamodel.put("opslist", opslist.toArray(new String[]{}));//putting it into a hash map with key as opslist and value as opslist object

在表单中添加代码。