//放在什么地方自己看着办
public static String documentToString(org.w3c.dom.Document xmldoc){
try{
java.io.StringWriter o = new StringWriter();
OutputFormat of = new OutputFormat();
XMLSerializer serializer = new XMLSerializer(o,of);
serializer.asDOMSerializer();
serializer.serialize( xmldoc.getDocumentElement() );
InputStream in = new StringBufferInputStream( inString );
javax.xml.parsers.DocumentBuilder db = _documentBuilderFactory.newDocumentBuilder();
org.w3c.dom.Document document = db.parse( in );