用递归个方式写dom解析

package testxml;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomXmlTest
{
 public static void DomTest(Node node)
 {
  NodeList books = node.getChildNodes();
  for(int i=0;i<books.getLength();i++)
  {
   Node  book = books.item(i);
   if(book.getNodeType() == Node.ELEMENT_NODE)
   {
    if(book.hasAttributes())
    {
     Element document = (Element)book;
     NamedNodeMap docmap = document.getAttributes();
     for(int j=0;j<docmap.getLength();j++)
     {
      Node booktwo = docmap.item(j);
      String value = booktwo.getFirstChild().getNodeValue();
      System.out.println("attribute="+booktwo.getNodeName()+"  "+value);
     }
    }
    if(book.getChildNodes().getLength()==1)
    {
     String attr = book.getFirstChild().getNodeValue();
     System.out.println(book.getNodeName()+": "+attr);
    }
    else
    {
     System.out.println(book.getNodeName());
     DomTest(book);
    }
   }
  }
 }
 public static void main(String args[])
 {
  DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();
  try {
   DocumentBuilder domBuilder = domfac.newDocumentBuilder();
   File is = new File("E:/test.xml");
   Document doc = domBuilder.parse(is);
   DomTest(doc);
  }
  catch (ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  catch(FileNotFoundException e)
  {
   e.printStackTrace();
  }
  catch(SAXException e)
  {
   e.printStackTrace();
  }
  catch(IOException e)
  {
   e.printStackTrace();
  }
 }
}