java转换xml、list、map和json

   很多朋友遇到xml，map和json互转的问题，在开发中xml和json越来越重要了。我就把我的工具类贴上来。

package com.shine.framework.core.util;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.json.JSON;
import net.sf.json.JSONSerializer;
import net.sf.json.xml.XMLSerializer;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

/**
 * common xml conver utility
 * 
 * @author [email protected]
 * @version Framework 2010.10.26
 * @url http://blog.csdn.net/arjick/article/details/6251777
 */
public class XmlConverUtil {
	/**
	 * map to xml xml value1value2......
	 * 
	 * @param map
	 * @return
	 */
	public static String maptoXml(Map map) {
		Document document = DocumentHelper.createDocument();
		Element nodeElement = document.addElement("node");
		for (Object obj : map.keySet()) {
			Element keyElement = nodeElement.addElement("key");
			keyElement.addAttribute("label", String.valueOf(obj));
			keyElement.setText(String.valueOf(map.get(obj)));
		}
		return doc2String(document);
	}

	/**
	 * list to xml xml value1value2......value1value2......
	 * 
	 * @param list
	 * @return
	 */
	public static String listtoXml(List list) throws Exception {
		Document document = DocumentHelper.createDocument();
		Element nodesElement = document.addElement("nodes");
		int i = 0;
		for (Object o : list) {
			Element nodeElement = nodesElement.addElement("node");
			if (o instanceof Map) {
				for (Object obj : ((Map) o).keySet()) {
					Element keyElement = nodeElement.addElement("key");
					keyElement.addAttribute("label", String.valueOf(obj));
					keyElement.setText(String.valueOf(((Map) o).get(obj)));
				}
			} else {
				Element keyElement = nodeElement.addElement("key");
				keyElement.addAttribute("label", String.valueOf(i));
				keyElement.setText(String.valueOf(o));
			}
			i++;
		}
		return doc2String(document);
	}

	/**
	 * json to xml {"node":{"key":{"@label":"key1","#text":"value1"}}} conver
	 * value1
	 * 
	 * @param json
	 * @return
	 */
	public static String jsontoXml(String json) {
		try {
			XMLSerializer serializer = new XMLSerializer();
			JSON jsonObject = JSONSerializer.toJSON(json);
			return serializer.write(jsonObject);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * xml to map xml value1value2......
	 * 
	 * @param xml
	 * @return
	 */
	public static Map xmltoMap(String xml) {
		try {
			Map map = new HashMap();
			Document document = DocumentHelper.parseText(xml);
			Element nodeElement = document.getRootElement();
			List node = nodeElement.elements();
			for (Iterator it = node.iterator(); it.hasNext();) {
				Element elm = (Element) it.next();
				map.put(elm.attributeValue("label"), elm.getText());
				elm = null;
			}
			node = null;
			nodeElement = null;
			document = null;
			return map;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * xml to list xml value1value2......value1value2......
	 * 
	 * @param xml
	 * @return
	 */
	public static List xmltoList(String xml) {
		try {
			List