xml.java

用java实现对xml的遍历（包括对节点和属性的遍历）

import javax.xml.parsers.*;
import org.xml.sax.*;
import java.io.*;
import org.w3c.dom.*;

public class xml 
{
	static Document document;
	public static void main(String [] args)
	{
		/*
		if(args.length!=1)
		{
			System.out.println("加载XML文档");
			return;
		}
		*/
	DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
	try
	{
		DocumentBuilder db=dbf.newDocumentBuilder();
		document=db.parse("X:\\java\\xml\\src\\studentInfo.xml");
		Node root=document.getDocumentElement();
		NodeList childs=root.getChildNodes();
		//printNode(root);
		getElement(childs);
	}
	catch(SAXException se)
	{
		Exception e=se;
		if(se.getException()!=null)
			e=se.getException();
		e.printStackTrace();
	}
	catch(ParserConfigurationException pe)
	{
		pe.printStackTrace();
		
	}
	catch(IOException ie)
	{
		ie.printStackTrace();
	}
	}
	
	
	public static void getElement(NodeList childs)
	{
		int i=0;
		if(childs.getLength()==0)
		{
			System.out.println("该节点没有子结点");
		}
		for(i=0;i<childs.getLength();i++)
		{
			Node node=childs.item(i);
			short nodetype=node.getNodeType();
			if(nodetype==Node.ELEMENT_NODE)
			{
				String name=node.getNodeName();
				String attrValue="",attrName="";
				System.out.println("This is element! name is:"+name);
				if(node.hasAttributes())
				{
					Node attrNode=node.getAttributes().item(0);
					attrName=attrNode.getNodeName();
					attrValue=attrNode.getNodeValue();
					System.out.println("This element arrt is:"+attrValue+";attrnameis:"+attrName);
				}
				if(node.hasChildNodes())
				{
					getElement(node.getChildNodes());
				}
				}
			if(nodetype==Node.TEXT_NODE)
			{
				String txtName=node.getNodeName();
				Node thisparent=node.getParentNode();
				Node txtNode=thisparent.getChildNodes().item(0);
				String txtValue=txtNode.getNodeValue();
				if(txtValue.trim().length()>0)
				{
					System.out.println("txtName="+txtName+";txtValue="+txtValue.trim());
				}
			}
		}
	}
	
	private static void printNode(Node anode) 
	{
		switch (anode.getNodeType()) 
		{
		case Node.ELEMENT_NODE:
			System.out.println(anode.getNodeName() + ", " + anode.getNodeValue());
			if (anode.hasAttributes()) 
			{
				NamedNodeMap attrs = anode.getAttributes();
				for (int i = 0; i < attrs.getLength(); i++) 
				{
					Node node = attrs.item(i);
					System.out.println("\t" + node.getNodeName()
							+ ", " + node.getNodeValue());
				}
			}
			break;
		case Node.TEXT_NODE:
			String txtValue = anode.getNodeValue().trim();
			if (txtValue.length() > 0)
				System.out.println(anode.getNodeName() 
								+ ", " + txtValue);
			break;
		default:
			System.out.println(
					anode.getNodeName() + ", " 
					+ anode.getNodeValue());
			break;
		}
	}

}