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

XML文件

将下列的XML文件进行修改，主要包括修改id属性的值，添加一个address节点，删除age节点，同时更新performance节点的值。 修改前XML文件： 
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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>

修改后XML文件：

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Class>
	<Student id="2">
		<name>duliu</name>
		<performance>100</performance>
		<address>China</address>
	</Student>
</Class>

示例代码

ModifyXML.java 
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package com.devnp.xml.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.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.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class ModifyXML {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String filepath = "D:\\Person-Test\\temp\\class.xml" ;
		
		//init 初始化
		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		
		DocumentBuilder docBuilder = null;
		try {
			docBuilder = docFactory.newDocumentBuilder();
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		Document doc = null ;
		
		try {
			doc = docBuilder.parse(filepath);
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		//get root节点
		//Node clas = doc.getFirstChild();
		
		//获取student, 这里取第一个
		Node student = doc.getElementsByTagName("Student").item(0);
		//Node student = clas.getFirstChild() ;
		
		//修改其属性值
		NamedNodeMap attr = student.getAttributes();
		Node nodeAttr = attr.getNamedItem("id");
		nodeAttr.setTextContent("2");
		
		//添加地址
		Element age = doc.createElement("address");
		age.appendChild(doc.createTextNode("China"));
		student.appendChild(age);
		
		//获取所有节点
		NodeList list = student.getChildNodes();
		
		for (int i = 0; i < list.getLength(); i++) {

			Node node = list.item(i);

			// 更新个人成绩属性
			if ("performance".equals(node.getNodeName())) {
				node.setTextContent("100");
			}

			//移除年纪节点
			if ("age".equals(node.getNodeName())) {
				student.removeChild(node);
			}

		}
		
		//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(filepath));
		
		try {
			transformer.transform(source, result);
		} catch (TransformerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		System.out.println("Update XML with DOM is Success.");
	}

}

相关

关于使用DOM方式来创建XML文件 ：Java XML DOM 创建XML文件