把xml转换成map

传过来一个xml文件,需要转换成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 

如下面的xml文件: 

 xml version="1.0" encoding="UTF-8"?>
 <GmMail>
     <template_id>2template_id>
     <to_address>[email protected]to_address>
     <to_alias>tomto_alias>
     <message>XML-未来世界 Messagemessage>
     <recipient_name>xml-tomrecipient_name>
     <send_address>[email protected]send_address>
     <sender_comp_name>xml-gmsender_comp_name>
     <subject>xml-hello guyssubject>
     <selected_items>
         <item_group>
             <item_url>http://china.gm.comitem_url>
             <item_name>gm中文站item_name>
             <item_desc>gm中文站descitem_desc>
             <item_desc2>gm中文站desc2item_desc2>
             <item_desc3>gm中文站desc3item_desc3>
             <item_desc4>gm中文站desc4item_desc4>
         item_group>
         <items_source>productsitems_source>
         <item_group>
             <item_url>http://www.gm.comitem_url>
             <item_name>gmitem_name>
             <item_desc>gmdescitem_desc>
         item_group>
     selected_items>
     <attachments>
         <attachment-group>
             <attachment_url>
                 http://china.gm.com/pics/com.cn.gm/story/frsc.jpg
             attachment_url>
             <attachment_name>黄晓豫attachment_name>
             <attachment_desc>
                 <desc1>attach-desc1desc1>
                 <desc2>attach-desc2desc2>
                 <desc3>attach-desc3desc3>
                 <desc4>attach-desc4desc4>
             attachment_desc>
         attachment-group>
         <attachment-group>
             <attachment_url>
                 http://china.gm.com/pics/com.cn.gm/story/wr.jpg
             attachment_url>
             <attachment_name>张中汉attachment_name>
             <attachment_desc>
                 <desc1>attach-desc1desc1>
                 <desc2>attach-desc2desc2>
             attachment_desc>
             <attachment_desc>
                 <desc1>attach-desc1desc1>
                 <desc2>attach-desc2desc2>
             attachment_desc>
         attachment-group>
     attachments>
     <desc_group>
         <desc_item>desc_item_1desc_item>
         <desc_item>desc_item_2desc_item>
         <desc_item>desc_item_3desc_item>
         <desc_item>desc_item_4desc_item>
         <desc_item>desc_item_5desc_item>
     desc_group>
 GmMail>

转换后的的Map(转换成字符串的效果): 

 {message=XML-未来世界 Message, selected_items={items_source=products, item_group=[{item_name=gm中文站, item_desc=gm中文站desc, item_desc2=gm中文站desc2, item_desc4=gm中文站desc4, item_url=http://china.gm.com, item_desc3=gm中文站desc3}, {item_name=gm, item_desc=gmdesc, item_url=http://www.gm.com}]}, to_alias=tom, desc_group={desc_item=[desc_item_1, desc_item_2, desc_item_3, desc_item_4, desc_item_5]}, sender_comp_name=xml-gm, subject=xml-hello guys, [email protected], template_id=2, attachments={attachment-group=[{attachment_url=http://china.gm.com/pics/com.cn.gm/story/frsc.jpg, attachment_name=黄晓豫, attachment_desc={desc3=attach-desc3, desc4=attach-desc4, desc1=attach-desc1, desc2=attach-desc2}}, {attachment_url=http://china.gm.com/pics/com.cn.gm/story/wr.jpg, attachment_name=张中汉, attachment_desc=[{desc1=attach-desc1, desc2=attach-desc2}, {desc1=attach-desc1, desc2=attach-desc2}]}]}, recipient_name=xml-tom, [email protected]}

xml处理用的dom4j 

下面是实现转换的主要类XmlUtils:  

 package xml.dom4j;

 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 {

     public static Map Dom2Map(Document doc){
         Map map = new HashMap();
         if(doc == null)
             return map;
         Element root = doc.getRootElement();
         for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
             Element e = (Element) iterator.next();
             //System.out.println(e.getName());
             List list = e.elements();
             if(list.size() > 0){
                 map.put(e.getName(), Dom2Map(e));
             }else
                 map.put(e.getName(), e.getText());
         }
         return map;
     }


     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;
     }

 }

下面是一个创建xml的类(不重要,可以忽略,只是用来生成一个xml以便测试,可以自己写) 

 package xml.dom4j;

 import org.dom4j.Document;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;

 public class CreateXml {

     /**
      * @param args
      */
     public static void main(String[] args) {
         // TODO Auto-generated method stub

     }

     public Document createXml(){
         Document doc = DocumentHelper.createDocument();
         Element e = doc.addElement("GmMail");
         e.addElement("template_id").setText("2");
         e.addElement("to_address").setText("[email protected]");
         e.addElement("to_alias").setText("tom");
         e.addElement("message").setText("XML-未来世界 Message");
         e.addElement("recipient_name").setText("xml-tom");
         e.addElement("send_address").setText("[email protected]");
         e.addElement("sender_comp_name").setText("xml-gm");
         e.addElement("subject").setText("xml-hello guys");
         Element Selecteditems = e.addElement("selected_items");

                 Element itemsGroup = Selecteditems.addElement("item_group");
             //Element item = itemsGroup.addElement("item");
                     itemsGroup.addElement("item_url").setText("http://china.gm.com");
                     itemsGroup.addElement("item_name").setText("gm中文站");
                     itemsGroup.addElement("item_desc").setText("gm中文站desc");
                     itemsGroup.addElement("item_desc2").setText("gm中文站desc2");
                     itemsGroup.addElement("item_desc3").setText("gm中文站desc3");
                     itemsGroup.addElement("item_desc4").setText("gm中文站desc4");
                 Selecteditems.addElement("items_source").setText("products");
                 itemsGroup = Selecteditems.addElement("item_group");
                     itemsGroup.addElement("item_url").setText("http://www.gm.com");
                     itemsGroup.addElement("item_name").setText("gm");
                     itemsGroup.addElement("item_desc").setText("gmdesc");
         Element attachment = e.addElement("attachments");
             Element attachmentGroup =   attachment.addElement("attachment-group");
                 attachmentGroup.addElement("attachment_url").setText("http://china.gm.com/pics/com.cn.gm/story/frsc.jpg");
                 attachmentGroup.addElement("attachment_name").setText("黄晓豫");
                     Element attachmentDesc = attachmentGroup.addElement("attachment_desc");
                     attachmentDesc.addElement("desc1").setText("attach-desc1");
                     attachmentDesc.addElement("desc2").setText("attach-desc2");
                     attachmentDesc.addElement("desc3").setText("attach-desc3");
                     attachmentDesc.addElement("desc4").setText("attach-desc4");
             attachmentGroup =   attachment.addElement("attachment-group");
                 attachmentGroup.addElement("attachment_url").setText("http://china.gm.com/pics/com.cn.gm/story/wr.jpg");
                 attachmentGroup.addElement("attachment_name").setText("张中汉");
                     attachmentDesc = attachmentGroup.addElement("attachment_desc");
                         attachmentDesc.addElement("desc1").setText("attach-desc1");
                         attachmentDesc.addElement("desc2").setText("attach-desc2");
                     attachmentDesc = attachmentGroup.addElement("attachment_desc");
                         attachmentDesc.addElement("desc1").setText("attach-desc1");
                         attachmentDesc.addElement("desc2").setText("attach-desc2");
         Element descGroup = e.addElement("desc_group");
             descGroup.addElement("desc_item").setText("desc_item_1");
             descGroup.addElement("desc_item").setText("desc_item_2");
             descGroup.addElement("desc_item").setText("desc_item_3");
             descGroup.addElement("desc_item").setText("desc_item_4");
             descGroup.addElement("desc_item").setText("desc_item_5");
         return doc;
     }
 }

下面是main调用类: 

 package xml.dom4j;

 import java.util.Map;

 import org.dom4j.Document;

 public class Demo {

     public static void main(String[] args){
         CreateXml create = new CreateXml();
         Document doc = create.createXml();
         String strXml = doc.asXML();
         System.out.println(strXml);

         Map map = XmlUtils.Dom2Map(doc);

         System.out.println(map.toString());
     }

 }