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));

 }

}