详解Java解析XML的四种方法

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); 
transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312"); 
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 
PrintWriter pw = new PrintWriter(new FileOutputStream(fileName)); 
StreamResult result = new StreamResult(pw); 
transformer.transform(source, result); 
System.out.println("生成XML文件成功!"); 
} catch (TransformerConfigurationException e) { 
System.out.println(e.getMessage()); 
} catch (IllegalArgumentException e) { 
System.out.println(e.getMessage()); 
} catch (FileNotFoundException e) { 
System.out.println(e.getMessage()); 
} catch (TransformerException e) { 
System.out.println(e.getMessage()); 
} 
} 
public void parserXml(String fileName) { 
try { 
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
DocumentBuilder db = dbf.newDocumentBuilder(); 
Document document = db.parse(fileName); 
NodeList employees = document.getChildNodes(); 
for (int i = 0; i < employees.getLength(); i++) { 
Node employee = employees.item(i); 
NodeList employeeInfo = employee.getChildNodes(); 
for (int j = 0; j < employeeInfo.getLength(); j++) { 
Node node = employeeInfo.item(j); 
NodeList employeeMeta = node.getChildNodes(); 
for (int k = 0; k < employeeMeta.getLength(); k++) { 
System.out.println(employeeMeta.item(k).getNodeName() 
+ ":" + employeeMeta.item(k).getTextContent()); 
} 
} 
} 
System.out.println("解析完毕"); 
} catch (FileNotFoundException e) { 
System.out.println(e.getMessage()); 
} catch (ParserConfigurationException e) { 
System.out.println(e.getMessage()); 
} catch (SAXException e) { 
System.out.println(e.getMessage()); 
} catch (IOException e) { 
System.out.println(e.getMessage()); 
} 
} 
} 

package com.alisoft.facepay.framework.bean;   
import java.io.File;   
import java.io.FileWriter;   
import java.io.IOException;   
import java.io.Writer;   
import java.util.Iterator;   
import org.dom4j.Document;   
import org.dom4j.DocumentException;   
import org.dom4j.DocumentHelper;   
import org.dom4j.Element;   
import org.dom4j.io.SAXReader;   
import org.dom4j.io.XMLWriter;   
/**  
*   
* @author hongliang.dinghl  
* Dom4j 生成XML文档与解析XML文档  
*/  
public class Dom4jDemo implements XmlDocument {   
public void createXml(String fileName) {   
Document document = DocumentHelper.createDocument();   
Element employees=document.addElement("employees");   
Element employee=employees.addElement("employee");   
Element name= employee.addElement("name");   
name.setText("ddvip");   
Element sex=employee.addElement("sex");   
sex.setText("m");   
Element age=employee.addElement("age");   
age.setText("29");   
try {   
Writer fileWriter=new FileWriter(fileName);   
XMLWriter xmlWriter=new XMLWriter(fileWriter);   
xmlWriter.write(document);   
xmlWriter.close();   
} catch (IOException e) {   
System.out.println(e.getMessage());   
}   

}   

public void parserXml(String fileName) {   
File inputXml=new File(fileName);   
SAXReader saxReader = new SAXReader();   
try {   
Document document = saxReader.read(inputXml);   
Element employees=document.getRootElement();   
for(Iterator i = employees.elementIterator(); i.hasNext();){   
Element employee = (Element) i.next();   
for(Iterator j = employee.elementIterator(); j.hasNext();){   
Element node=(Element) j.next();   
System.out.println(node.getName()+":"+node.getText());   
}   
}   
} catch (DocumentException e) {   
System.out.println(e.getMessage());   
}   
System.out.println("dom4j parserXml");   
}   
}   

package com.alisoft.facepay.framework.bean;   
import java.io.FileNotFoundException;   
import java.io.FileOutputStream;   
import java.io.IOException;