org.w3c.dom.Document对象与org.dom4j.Document对象互相转换

[woderoom]

如题
我现在是如下的写法,请教效率高一点的（重点是org.dom4j.Document -> org.w3c.dom.Document的转换），感谢。
/**
* org.w3c.dom.Document -> org.dom4j.Document
* @param doc Document(org.w3c.dom.Document)
* @return Document
*/
public static Document parse(org.w3c.dom.Document doc) throws Exception {
if (doc == null) {
return (null);
}
org.dom4j.io.DOMReader xmlReader = new org.dom4j.io.DOMReader();
return (xmlReader.read(doc));
}

/**
* org.dom4j.Document -> org.w3c.dom.Document
* @param doc Document(org.dom4j.Document)
* @throws Exception
* @return Document
*/
public static org.w3c.dom.Document parse(Document doc) throws Exception {
if (doc == null) {
return (null);
}
java.io.StringReader reader = new java.io.StringReader(doc.asXML());
org.xml.sax.InputSource source = new org.xml.sax.InputSource(reader);
javax.xml.parsers.DocumentBuilderFactory documentBuilderFactory =
javax.xml.parsers.DocumentBuilderFactory.newInstance();
javax.xml.parsers.DocumentBuilder documentBuilder = documentBuilderFactory.
newDocumentBuilder();
return (documentBuilder.parse(source));
}