xml 转map dom4j

http://ziyu-1.iteye.com/blog/469003

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>2</template_id>

     <to_address>test@corp.gm.com</to_address>

     <to_alias>tom</to_alias>

     <message>XML-未来世界 Message</message>

     <recipient_name>xml-tom</recipient_name>

     <send_address>xml-test@163.com</send_address>

     <sender_comp_name>xml-gm</sender_comp_name>

     <subject>xml-hello guys</subject>

     <selected_items>

         <item_group>

             <item_url>http://china.gm.com</item_url>

             <item_name>gm中文站</item_name>

             <item_desc>gm中文站desc</item_desc>

             <item_desc2>gm中文站desc2</item_desc2>

             <item_desc3>gm中文站desc3</item_desc3>

             <item_desc4>gm中文站desc4</item_desc4>

         </item_group>

         <items_source>products</items_source>

         <item_group>

             <item_url>http://www.gm.com</item_url>

             <item_name>gm</item_name>

             <item_desc>gmdesc</item_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-desc1</desc1>

                 <desc2>attach-desc2</desc2>

                 <desc3>attach-desc3</desc3>

                 <desc4>attach-desc4</desc4>

             </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-desc1</desc1>

                 <desc2>attach-desc2</desc2>

             </attachment_desc>

             <attachment_desc>

                 <desc1>attach-desc1</desc1>

                 <desc2>attach-desc2</desc2>

             </attachment_desc>

         </attachment-group>

     </attachments>

     <desc_group>

         <desc_item>desc_item_1</desc_item>

         <desc_item>desc_item_2</desc_item>

         <desc_item>desc_item_3</desc_item>

         <desc_item>desc_item_4</desc_item>

         <desc_item>desc_item_5</desc_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, to_address=test@corp.gm.com, 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, send_address=xml-test@163.com}

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<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();

             //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("test@corp.gm.com");

         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("xml-test@163.com");

         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());

     }

 }

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