Dom4j递归遍历XML，返回对象(json)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE toolbox>
<toolbox>
<tool>
<key>date</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.DateTool</class>
</tool>
<tool>
<key>number</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.NumberTool</class>
</tool>
<tool>
<key>math</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.MathTool</class>
</tool>
<tool>
<key>render</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.RenderTool</class>
</tool>

</toolbox>

package test.demo2;

import java.io.InputStream;
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;
import org.dom4j.io.SAXReader;

import com.alibaba.fastjson.JSON;

public class Dom4j {
public static Object parse(Element root) {
List<?> elements = root.elements();
if (elements.size() == 0) {
// 没有子元素
return root.getTextTrim();
} else {
// 有子元素
String prev = null;
boolean guess = true; // 默认按照数组处理

Iterator<?> iterator = elements.iterator();
while (iterator.hasNext()) {
Element elem = (Element) iterator.next();
String name = elem.getName();
if (prev == null) {
prev = name;
} else {
guess = name.equals(prev);
break;
}
}
iterator = elements.iterator();
if (guess) {
List<Object> data = new ArrayList<Object>();
while (iterator.hasNext()) {
Element elem = (Element) iterator.next();
((List<Object>) data).add(parse(elem));
}
return data;
} else {
Map<String, Object> data = new HashMap<String, Object>();
while (iterator.hasNext()) {
Element elem = (Element) iterator.next();
((Map<String, Object>) data).put(elem.getName(), parse(elem));
}
return data;
}
}
}

public static void main(String[] args) throws Throwable {
SAXReader reader = new SAXReader();
InputStream in = Dom4j.class.getResourceAsStream("toolbox.xml");
Document document = reader.read(in);
Element root = document.getRootElement();

Object obj = parse(root); // 返回类型未知，已知DOM结构的时候可以强制转换

System.out.println(JSON.toJSON(obj)); // 打印JSON
}
}