本例以Windows, JDK1.7 为基础，来演示使用Java 采用DOM方式来创建XML文件。

XML文件

需要创建的XML效果如下： 
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Class>
	<Student id="1">
		<name>duliu</name>
		<age>26</age>
		<performance>99</performance>
	</Student>
</Class>

示例代码

CreateXML.java 来创建XML文件。 
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package com.devnp.xml.dom;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
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.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class CreateXML {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		

		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		
		DocumentBuilder docBuilder = null;
		
		try {
			docBuilder = docFactory.newDocumentBuilder();
			
			
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		//根节点
		Document doc = docBuilder.newDocument();
		Element rootElement = doc.createElement("Class");
		doc.appendChild(rootElement);
		
		//创建Student
		Element staff = doc.createElement("Student");
		rootElement.appendChild(staff);
		
		//设置id属性
		Attr attr = doc.createAttribute("id");
		attr.setValue("1");
		staff.setAttributeNode(attr);
		
		//设置Name
		Element name = doc.createElement("name");
		name.appendChild(doc.createTextNode("duliu"));
		staff.appendChild(name);
		
		//设置年纪
		Element age = doc.createElement("age");
		age.appendChild(doc.createTextNode("26"));
		staff.appendChild(age);
		
		//设置成绩
		Element performance = doc.createElement("performance");
		performance.appendChild(doc.createTextNode("99"));
		staff.appendChild(performance);
		
		//写入到文件
		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		Transformer transformer = null ;
		try {
			transformer = transformerFactory.newTransformer();
		} catch (TransformerConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		DOMSource source = new DOMSource(doc);
		StreamResult result = new StreamResult(new File("D:\\Person-Test\\temp\\class.xml"));
		
		try {
			transformer.transform(source, result);
		} catch (TransformerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		System.out.println("Create XML with DOM is Success.");
	}

}