使用xstream映射鍵值xml對到java映射

Question

我想將xml文件轉換爲java映射。 XML

<Person> 
    <ID>123</ID> 
    <Demographics> 
    <LastName>ABC</LastName> 
    <FirstName>XYZ</FirstName> 
    </Demographics> 
    <Married>YES</Married> 
</Person> 

的XStream的代碼如下：

final XStream xstream = new XStream(); 
    xstream.alias("Person", Map.class); 
    xstream.alias("Demographics", Map.class); 
    xstream.registerConverter(new MapEntryConverter()); 

    final Map<String, Object> map2 = (Map<String, Object>) xstream.fromXML(xml);//where xml is above defined string. 

定製MapEntryConverter是：

public class MapEntryConverter implements Converter 
{ 
    public boolean canConvert(final Class clazz) 
    { 
     return AbstractMap.class.isAssignableFrom(clazz); 
    } 

    public void marshal(final Object value, final HierarchicalStreamWriter writer, final MarshallingContext context) 
    { 
     final AbstractMap<String, String> map = (AbstractMap<String, String>) value; 
     for (final Entry<String, String> entry : map.entrySet()) 
     { 
      writer.startNode(entry.getKey().toString()); 
      writer.setValue(entry.getValue().toString()); 
      writer.endNode(); 
     } 
    } 

    public Object unmarshal(final HierarchicalStreamReader reader, final UnmarshallingContext context) 
    { 
     final Map<String, String> map = new HashMap<String, String>(); 
     while (reader.hasMoreChildren()) 
     { 
      reader.moveDown(); 
      map.put(reader.getNodeName(), reader.getValue()); 
      reader.moveUp(); 
     } 
     return map; 
    } 
} 

所以地圖現在僅由ID和已婚的作爲鍵 - 值對。它不會將人口統計信息父級轉換爲其相應的名稱值對。

我想所有的標籤名稱作爲鍵和他們的值作爲地圖值。

Answer 1

。利用在MarshallingContext的convertAnother方法來處理數據的分層特性，例如：

public class MapEntryConverter implements Converter { 

    public boolean canConvert(final Class clazz) { 
     return Map.class.isAssignableFrom(clazz); 
    } 

    public void marshal(final Object value, final HierarchicalStreamWriter writer, final MarshallingContext context) { 
     Map<String, Object> map = (Map<String, Object>) value; 
     for (Map.Entry<String, Object> entry : map.entrySet()) { 
      if (entry.getValue() instanceof Map) { 
       writer.startNode(entry.getKey()); 
       context.convertAnother(entry.getValue()); 
       writer.endNode(); 
      } else { 
       writer.startNode(entry.getKey()); 
       writer.setValue(entry.getValue().toString()); 
       writer.endNode(); 
      } 
     } 
    } 

    public Object unmarshal(final HierarchicalStreamReader reader, final UnmarshallingContext context) { 
     Map<String, Object> map = new HashMap<String, Object>(); 
     while (reader.hasMoreChildren()) { 
      reader.moveDown(); 
      if (reader.hasMoreChildren()) { 
       Map<String, Object> childMap = (Map<String, Object>) context.convertAnother(new HashMap<String, Object>(), Map.class); 
       map.put(reader.getNodeName(), childMap); 
      } else { 
       map.put(reader.getNodeName(), reader.getValue()); 
      } 

      reader.moveUp(); 
     } 
     return map; 
    } 
}