解析xml的方法

package com.alisoft.facepay.framework.bean; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; 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; 
/** * * @author hongliang.dinghl * DOM生成与解析XML文档 */ 
public class DomDemo implements XmlDocument { 
private Document document; 
private String fileName; 
public void init() { 
try { 
DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); 
DocumentBuilder builder = factory.newDocumentBuilder(); 
this.document = builder.newDocument(); 
} catch (ParserConfigurationException e) { 
System.out.println(e.getMessage()); 
} } 
public void createXml(String fileName) {
 Element root = this.document.createElement("employees");
 this.document.appendChild(root); 
Element employee = this.document.createElement("employee"); 
Element name = this.document.createElement("name");
 name.appendChild(this.document.createTextNode("丁宏亮")); 
employee.appendChild(name);
 Element sex = this.document.createElement("sex"); 
sex.appendChild(this.document.createTextNode("m")); 
employee.appendChild(sex); 
Element age = this.document.createElement("age");
 age.appendChild(this.document.createTextNode("30")); 
employee.appendChild(age); root.appendChild(employee); 
TransformerFactory tf = TransformerFactory.newInstance(); 
try { Transformer transformer = tf.newTransformer(); 
DOMSource source = new DOMSource(document);