replacechild.java

Java编写的DOM的XML的解析器。用 DOM 解析模型的优点是编程容易

import org.w3c.dom.*;

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public class ReplaceChild {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try
		{
		  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		
		  DocumentBuilder builder = factory.newDocumentBuilder();
		
		  Document doc = builder.parse("Teams.xml");
		
		  doc.normalize();
		  
		  Element root =doc.getDocumentElement();
		  
Element newmember = doc.createElement("Member");
		  
		  Attr age = doc.createAttribute("Age");
		  
		  Attr sex = doc.createAttribute("Sex");
		  
		  Text mem_text = doc.createTextNode("Ronaldo");
		  
		  newmember.setAttribute(age.getNodeName(), "36");
		  
		  newmember.setAttribute(sex.getNodeName(), "Male");
		  
		  newmember.appendChild(mem_text);
		  
	      Element oldmember =(Element)doc.getElementsByTagName("Member").item(0);
	      
	      root.getFirstChild().replaceChild(newmember,oldmember);
	      
		  if(doc!=null)
		  {
			  printNode(root);
		  }
		  
		  TransformerFactory tFactory = TransformerFactory.newInstance();
		  
		  Transformer transformer = tFactory.newTransformer();
		  
		  DOMSource source = new DOMSource(doc);
		  
		  StreamResult result = new StreamResult(new java.io.File("Teams.xml"));
		  
		  transformer.transform(source, result);
		  
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}

	private static void printNode(Element element)
	{
		int k;
		
		NamedNodeMap attr;
		
		NodeList children = element.getChildNodes();
		
		attr= element.getAttributes();
		
		int r= children.getLength();
		
		if(attr !=null)
		{
			System.out.print("<"+element.getNodeName());
			for(int j=0;j<attr.getLength();j++)
			{
				System.out.print(" "+attr.item(j).getNodeName()+"="+attr.item(j).getNodeValue()+" ");
			}
			System.out.println(">");
		}
		else if(attr == null)
		{
			System.out.print("<"+element.getNodeName()+">");
		}
		if(element.hasChildNodes())
		{
			for(k=0;k<r;k++)
			{
				if(children.item(k).getNodeType()== org.w3c.dom.Node.ELEMENT_NODE)
				{
					printNode((Element)children.item(k));
				}
				else if(children.item(k).getNodeType()== org.w3c.dom.Node.TEXT_NODE)
				{
					System.out.println(children.item(k).getNodeValue());
				}
			}
			System.out.println("</"+element.getNodeName()+">");
		}
	}
}