将xml转换成Map,能够应对不用结构的xml,而不是只针对固定格式的xml.
转换规则:
1.主要是Map与List的互相嵌套
2.同名称的节点会被装进List
示例:
import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.dom4j.Document; import org.dom4j.Element; public class XmlUtils { @SuppressWarnings("unchecked") public static Map<String, Object> Dom2Map(Document doc){ Map<String, Object> map = new HashMap<String, Object>(); if(doc == null) return map; Element root = doc.getRootElement(); for (Iterator iterator = root.elementIterator(); iterator.hasNext();) { Element e = (Element) iterator.next(); List list = e.elements(); if(list.size() > 0){ map.put(e.getName(), Dom2Map(e)); }else map.put(e.getName(), e.getText()); } return map; } @SuppressWarnings("unchecked") public static Map Dom2Map(Element e){ Map map = new HashMap(); List list = e.elements(); if(list.size() > 0){ for (int i = 0;i < list.size(); i++) { Element iter = (Element) list.get(i); List mapList = new ArrayList(); if(iter.elements().size() > 0){ Map m = Dom2Map(iter); if(map.get(iter.getName()) != null){ Object obj = map.get(iter.getName()); if(!obj.getClass().getName().equals("java.util.ArrayList")){ mapList = new ArrayList(); mapList.add(obj); mapList.add(m); } if(obj.getClass().getName().equals("java.util.ArrayList")){ mapList = (List) obj; mapList.add(m); } map.put(iter.getName(), mapList); }else map.put(iter.getName(), m); } else{ if(map.get(iter.getName()) != null){ Object obj = map.get(iter.getName()); if(!obj.getClass().getName().equals("java.util.ArrayList")){ mapList = new ArrayList(); mapList.add(obj); mapList.add(iter.getText()); } if(obj.getClass().getName().equals("java.util.ArrayList")){ mapList = (List) obj; mapList.add(iter.getText()); } map.put(iter.getName(), mapList); }else map.put(iter.getName(), iter.getText()); } } }else map.put(e.getName(), e.getText()); return map; } }
测试类:
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
public class XmlToMapDemo {
public static void main(String[] args) throws IOException,
DocumentException {
FileInputStream fis = new FileInputStream("d://a.xml");
byte[] b = new byte[fis.available()];
fis.read(b);
String str = new String(b);
Document doc = DocumentHelper.parseText(str);
System.out.println(doc.asXML());
long beginTime = System.currentTimeMillis();
Map<String, Object> map = XmlUtils.Dom2Map(doc);
System.out.println(map.toString());
System.out.println("Use time:"+(System.currentTimeMillis()-beginTime));
}
}