xml 转 json

package com.zouhao.XmlJsonUtils;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.InputStream;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;

public class Xml2JsonUtil {
/**
* 转换一个xml格式的字符串到json格式
*
* @param xml
*            xml格式的字符串
* @return 成功返回json 格式的字符串;失败反回null
*/
@SuppressWarnings("unchecked")
public static  String xml2JSON(String xml) {
JSONObject obj = new JSONObject();
try {
InputStream is = new ByteArrayInputStream(xml.getBytes("utf-8"));
SAXBuilder sb = new SAXBuilder();
Document doc = sb.build(is);
Element root = doc.getRootElement();
obj.put(root.getName(), iterateElement(root));
return obj.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

/**
* 转换一个xml格式的字符串到json格式
*
* @param file
*            java.io.File实例是一个有效的xml文件
* @return 成功反回json 格式的字符串;失败反回null
*/
@SuppressWarnings("unchecked")
public static String xml2JSON(File file) {
JSONObject obj = new JSONObject();
try {
SAXBuilder sb = new SAXBuilder();
Document doc = sb.build(file);
Element root = doc.getRootElement();
obj.put(root.getName(), iterateElement(root));
return obj.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

/**
* 一个迭代方法
*
* @param element
*            : org.jdom.Element
* @return java.util.Map 实例
*/
@SuppressWarnings("unchecked")
private static Map  iterateElement(Element element) {
List jiedian = element.getChildren();
Element et = null;
Map obj = new HashMap();
List list = null;
for (int i = 0; i < jiedian.size(); i++) {
list = new LinkedList();
et = (Element) jiedian.get(i);
if (et.getTextTrim().equals("")) {
if (et.getChildren().size() == 0)
continue;
if (obj.containsKey(et.getName())) {
list = (List) obj.get(et.getName());
}
list.add(iterateElement(et));
obj.put(et.getName(), list);
} else {
if (obj.containsKey(et.getName())) {
list = (List) obj.get(et.getName());
}
list.add(et.getTextTrim());
obj.put(et.getName(), list);
}
}
return obj;
}

// 测试
public static void main(String[] args) {
String xml = "<MapSet>"
+ "<MapGroup id='Sheboygan'>" + "<Map>"
+ "<Type>MapGuideddddddd</Type>"
+ "<SingleTile>true</SingleTile>" + "<Extension>"
+ "<ResourceId>ddd</ResourceId>" + "</Extension>" + "</Map>"
+ "<Map>" + "<Type>ccc</Type>" + "<SingleTile>ggg</SingleTile>"
+ "<Extension>" + "<ResourceId>aaa</ResourceId>"
+ "</Extension>" + "</Map>" + "<Extension />" + "</MapGroup>"
+ "<ddd>" + "33333333" + "</ddd>" + "<ddd>" + "444" + "</ddd>"
+ "</MapSet>";
System.out.println(xml);
System.out.println(  Xml2JsonUtil.xml2JSON(xml));
}
}