问java输出xml问题

File file=new File("C:/xml_out.xml");

FileOutputStream fout=new FileOutputStream(file);

String mysql="select xml_c from myxml where id=?";

OraclePreparedStatement opst=(OraclePreparedStatement) myConnection.prepareStatement(mysql);

opst.setString(1,"20070622001");

OracleResultSet ors=(OracleResultSet)opst.executeQuery();

if(ors.next())

{

// get the XMLType

XMLType poxml = XMLType.createXML(ors.getOPAQUE(1));

// get the XMLDocument

Document podoc = (Document)poxml.getDOM();

// 这里有问题

((XmlDocument)podoc).write(fout);

//?????????????????????????????

}

ors.close();

System.out.println("xml文件已经读出到指定文件内！");

}

catch(Exception e)

{

System.out.println("error :"+e.toString() );

e.printStackTrace();

}

请高手修改好此程序，能够正确输出好吗？或者有更好的方法也行