Question

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
}

自由标记模板

<#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>

java文件的输出是

get
set
value
usage

Freemarket模板的输出

usage

为什么只打印最后一个值？
有人能告诉我在freemarker模板中做正确的方法吗？

Answer 1

看起来您正在为列表中的每个元素创建一个新的操作列表。以这种方式，只有最后一个元素被传递给freemarker。只需把List opslist = new ArrayList（）;在for循环前面

Answer 2

那是因为你在for循环的每次迭代中都创建了一个新列表。此外，您在datamodel映射中为同一个键添加了4个列表。它应该纠正如下：

    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

将列表传递给freemarker

2 个答案: