主要是CRUD操作 U操作,没有更新!

package com.gyarmy.dom;



import java.io.File;

import java.io.IOException;



import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.*;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;



import junit.framework.Assert;



import org.junit.Test;

import org.w3c.dom.*;

import org.xml.sax.SAXException;



public class TestDom {



	//获取内容

	@Test

	public void testReadXML() throws ParserConfigurationException, SAXException, IOException{

		Document document = getDocument();

		

		NodeList nl = document.getElementsByTagName("书名");

		

		int length = nl.getLength();

		

		//System.out.println(length);

		Node firstNode = nl.item(0);

		String result = firstNode.getTextContent();

		//System.out.println(result);

		Assert.assertEquals("明朝那些事儿", result);

		

	}

	

	//获取属性

	@Test 

	public void testReadAttribute() throws ParserConfigurationException, SAXException, IOException{

		//获取document;

		Document document = getDocument();

		NodeList nl = document.getElementsByTagName("书");

		Element firstNode = (Element)nl.item(0);

		String result = firstNode.getAttribute("出版社");

		Assert.assertEquals("深圳出版社", result);

		

	}

	

	//添加节点

	@Test

	public void testAddPrice() throws ParserConfigurationException, SAXException, IOException, TransformerException

	{

		Document document = getDocument();

		//创建节点

		Element newElement = document.createElement("price");

		newElement.setTextContent("打折9.8");

		

		//得到节点

		NodeList nl = document.getElementsByTagName("书");

		Node firstNode = nl.item(0);

		//添加节点

		firstNode.appendChild(newElement);

		writeBackToXML(document);

	}



	

	

	//删除节点

	@Test

	public void testRemovePrice() throws ParserConfigurationException, SAXException, IOException, TransformerException

	{

		Document document = getDocument();

		//得到节点

		NodeList nlk = document.getElementsByTagName("price");

		Element delElement = (Element)nlk.item(0);

		

		//得到节点

		NodeList nl = document.getElementsByTagName("书");

		Node firstNode = nl.item(0);

		//删除节点

		firstNode.removeChild(delElement);

		

		writeBackToXML(document);

	}

	

	//更新节点

	@Test

	public void updatePrice() throws ParserConfigurationException, SAXException, IOException

	{

	

	}

	

	//打印及诶单元素

	@Test

	

	public void printAllElements()throws ParserConfigurationException, SAXException, IOException

	{

		

		Document document = getDocument();

		NodeList nl = document.getElementsByTagName("书");

		for(int i=0;i<nl.getLength();i++)

		{

			Node node = nl.item(i).getFirstChild();

			while(true)

			{

				Node nextNode = node.getNextSibling();

				if(nextNode == null)

				{

					break;

				}

				String nodeName = nextNode.getNodeName();

				if(nodeName!="#text")

				{

					String nodeValue = nextNode.getTextContent();

					System.out.println(nodeName+" : "+nodeValue);

				}

				node = nextNode;

			}

			System.out.println();

		}

		

		System.out.println("www.gyarmy.com");

	}

	

	@Test

	public void printElementName() throws ParserConfigurationException, SAXException, IOException

	{

		Document document = getDocument();

		printAllElementsName(document);

	}

	public void printAllElementsName(Node node)

	{

		if(Node.ELEMENT_NODE == node.getNodeType())

		{

			System.out.println(node.getNodeName());

		}

		

		NodeList nodes = node.getChildNodes();

		for(int i=0;i<nodes.getLength();i++)

		{

			//System.out.println(nodes.item(i).getNodeName());

			

			printAllElementsName(nodes.item(i));

		}

		

		

	}



	private Document getDocument() throws ParserConfigurationException,

			SAXException, IOException {

		//获得XML对象

		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

		DocumentBuilder builder = factory.newDocumentBuilder();

		Document document = builder.parse("src/demo1.xml");

		return document;

	}

	

	private void writeBackToXML(Document document)

			throws TransformerFactoryConfigurationError,

			TransformerConfigurationException, TransformerException {

		//写入文件

		//TransformerFactory.newTransformer 

		TransformerFactory factory = TransformerFactory.newInstance();

		Transformer tf = factory.newTransformer();

		

		tf.transform(new DOMSource(document),new StreamResult(new File("src/demo1.xml")));

	}

	

}