dom读写xml

package com.xml;
 
import java.io.File;
import java.io.IOException;
 
import javax.xml.crypto.dsig.Transform;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
 
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
 
public class DOM {
	public static void dom_read() {
		DocumentBuilderFactory d=DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder bu=d.newDocumentBuilder();
			Document dom=bu.parse("pom1.xml");
			NodeList nl=dom.getElementsByTagName("dependency");
			System.out.println(nl.getLength());
			for(int i=0;i<nl.getLength();i++) {
				Node node=nl.item(i);
				NodeList nnm=node.getChildNodes();
 
				for(int k=0;k<nnm.getLength();k++) {
					Node node1=nnm.item(k);
					if(node1.getNodeType()==Node.ELEMENT_NODE) {
						String tt=node1.getNodeName();
						String tt1=node1.getTextContent();
						System.out.println(tt+":"+tt1+"\n");
					}
 
				}
			}
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
 
	public static void dom_write() throws TransformerConfigurationException {
		DocumentBuilderFactory d=DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder bu=d.newDocumentBuilder();
			Document Document = bu.newDocument();
//			Document.setXmlStandalone(true);
			Element eleroot=Document.createElement("books");
			Element elebook=Document.createElement("book");
			Element bookname=Document.createElement("name");
			bookname.setTextContent("xiaowangzi");
			elebook.setAttribute("id", "1");
			elebook.appendChild(bookname);
			eleroot.appendChild(elebook);
			Document.appendChild(eleroot);
			TransformerFactory tf=TransformerFactory.newInstance();
 
			try {
				Transformer t=tf.newTransformer();
				t.setOutputProperty(OutputKeys.INDENT, "yes");
				t.transform(new DOMSource(Document), new StreamResult(new File("books1.xml")));
			} catch (TransformerException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
 
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
 
	}
	public static void main(String[] args) throws TransformerConfigurationException {
		dom_read();
		dom_write();
	}
 
}