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>2</template_id>
	<to_address>[e-mail]</to_address>
	<to_alias>tom</to_alias>
	<message>XML-未来世界 Message</message>
	<recipient_name>xml-tom</recipient_name>
	<send_address>[e-mail]</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=[e-mail], 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=[e-mail]}

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("[e-mail]");
		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("[e-mail]");
		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());
	}

}

评论

3 楼 ziyu_1 2012-06-29  

helwens 写道

这个工具的局限性在于不能解析出节点属性

因为当时没这个需求，也就没考虑。如果要解析属性的话，就复杂了

2 楼 helwens 2012-04-05  

这个工具的局限性在于不能解析出节点属性

1 楼 crazycl 2010-12-17  

楼主，能把Map再转换回XML吗？