我有一个要整理的物体。
@XmlRootElement
public class BoxItem {
@XmlElement
Map<Integer, ArrayList<String>> intgerStringArrMap;
BoxItem() {
intgerStringArrMap = new HashMap<Integer, ArrayList<String>>();
for (int i = 0; i < 3; i++) {
ArrayList<String> stringArrayList = new ArrayList<String>();
for (int j = 0; j < 10; j++) {
stringArrayList.add(new BigInteger(130, new SecureRandom()).toString(32));
}
intgerStringArrMap.put(i, stringArrayList);
}
}
}
现在假设我们有一个boxItem = new BoxItem()
如果我调用jaxbMarshaller.marshal(boxItem,System.out);,则每个条目的值为空。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<boxItem>
<intgerStringArrMap>
<entry>
<key>0</key>
<value/>
</entry>
<entry>
<key>1</key>
<value/>
</entry>
<entry>
<key>2</key>
<value/>
</entry>
</intgerStringArrMap>
</boxItem>
如何将MapList中ArrayList内部的元素编码?
最佳答案
您应该使用@XmlElementWrapper注释。它们用于围绕Collections
产生包装XML元素
为您的ArrayList
定义一个包装器,如下所示,
class ListWrapper {
@XmlElementWrapper(name = "wrapperList")
private List<String> list;
public void setList(List<String> list) {
this.list = list;
}
}
在
BoxItem
类中如下定义 map ,@XmlElementWrapper(name = "integerMap")
Map<Integer, ListWrapper> intgerStringArrMap;
这是完整的类(class)。
@XmlRootElement
public class BoxItem {
@XmlElementWrapper(name = "integerMap")
Map<Integer, ListWrapper> intgerStringArrMap;
BoxItem() {
intgerStringArrMap = new HashMap<Integer, ListWrapper>();
for (int i = 0; i < 2; i++) {
ArrayList<String> stringArrayList = new ArrayList<String>();
ListWrapper wrapper = new ListWrapper();
wrapper.setList(stringArrayList);
for (int j = 0; j < 2; j++) {
stringArrayList.add("2");
}
intgerStringArrMap.put(i, wrapper);
}
}
public static void main(String[] args) throws JAXBException {
BoxItem box = new BoxItem();
JAXBContext jc = JAXBContext.newInstance(BoxItem.class);
jc.createMarshaller().marshal(box, System.out);
}
}
class ListWrapper {
@XmlElementWrapper(name = "wrapperList")
private List<String> list;
public void setList(List<String> list) {
this.list = list;
}
}
运行上面的命令应获得以下输出,
<boxItem>
<integerMap>
<entry>
<key>0</key>
<value>
<wrapperList>
<list>2</list>
<list>2</list>
</wrapperList>
</value>
</entry>
<entry>
<key>1</key>
<value>
<wrapperList>
<list>2</list>
<list>2</list>
</wrapperList>
</value>
</entry>
</integerMap>
</boxItem>