JDOM写入XML文件

package com.gyj.jdom;

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;


/**
 * 写入DOM到XML文件
 * @author GYJ
 * @date 2014-3-23
 */
public class XMLWriterDOM {

	/**
	 * 将会写入这么一份文件
	 * <p>1、根元素为"Employees" , 命名空间为"http://www.miamiheat.com"
	 * 2、创建两份员工，都有id属性
	 * 3、内容都有姓名、年龄、角色
	 * 4、写出数据到文件、打印到控制台
	 * @param args
	 * @throws TransformerException 
	 */
	public static void main(String[] args) throws TransformerException {
		DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder dBuilder;
		try {
			dBuilder = dbFactory.newDocumentBuilder();
			Document doc = dBuilder.newDocument();
			//添加根元素
			Element rootElement = doc.createElementNS("http://www.miamiheat.com", "Employees");
			doc.appendChild(rootElement);
			//添加子元素到根目录下
			rootElement.appendChild(getEmployee(doc, "1", "gyj", "18"));
			rootElement.appendChild(getEmployee(doc, "2", "james", "29"));
			//把创建好的文件输出
			TransformerFactory transformerFactory = TransformerFactory.newInstance();
			Transformer transformer = transformerFactory.newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			DOMSource domSource = new DOMSource(doc);
		
			//控制台输出
			StreamResult console = new StreamResult(System.out);
			//输出到文件
			StreamResult file = new StreamResult("emp.xml");
			//写数据
			transformer.transform(domSource, console);
			transformer.transform(domSource, file);
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		}
		
		//out put==============================================
		/*<?xml version="1.0" encoding="UTF-8" standalone="no"?>
		<Employees xmlns="http://www.miamiheat.com">
		<employee id="1">
		<name>gyj</name>
		<age>18</age>
		</employee>
		<employee id="2">
		<name>james</name>
		<age>29</age>
		</employee>
		</Employees>*/
		//======================================================
		//生成了emp.xml
		/*<?xml version="1.0" encoding="UTF-8" standalone="no"?>
		<Employees xmlns="http://www.miamiheat.com">
		<employee id="1">
		<name>gyj</name>
		<age>18</age>
		</employee>
		<employee id="2">
		<name>james</name>
		<age>29</age>
		</employee>
		</Employees>*/
		

		
	}
	
	private static Node getEmployee(Document doc, String id, String name, String age) {
		//创建子节点
		Element employee = doc.createElement("employee");
		employee.setAttribute("id", id);
		//创建字节点的元素
		employee.appendChild(getEmployeeElements(doc, employee, "name", name));
		employee.appendChild(getEmployeeElements(doc, employee, "age", age));
		return employee;
	}
	
	/**
	 * 创建子元素节点
	 * @param doc	文档对象
	 * @param element	子元素的tag
	 * @param name		子元素节点
	 * @param value		子元素节点值
	 * @return
	 */
	private static Node getEmployeeElements(Document doc, Element element, String name, String value) {
		Element node = doc.createElement(name);
		node.appendChild(doc.createTextNode(value));
		return node;
	}
	

}