DOM 操作XML

使用java JDK中的DOM解析xml

import java.io.FileOutputStream;
import java.io.PrintWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
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;

/** DOM生成与解析XML文档 */
public class DomDemo{

	/**
	 * 创建xml文件
	 * @param filePath 文件完整路径
	 */
	public void createXml(String filePath) {
		try {
			DocumentBuilderFactory factory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document document = builder.newDocument();
			Element root = document.createElement("employees");
			document.appendChild(root);
			Element employee = document.createElement("employee");
			Element name = document.createElement("name");
			name.appendChild(document.createTextNode("雨无声"));
			employee.appendChild(name);
			Element sex = document.createElement("sex");
			sex.appendChild(document.createTextNode("m"));
			employee.appendChild(sex);
			Element age = document.createElement("age");
			age.appendChild(document.createTextNode("30"));
			employee.appendChild(age);
			root.appendChild(employee);
			TransformerFactory tf = TransformerFactory.newInstance();
			
			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(filePath));
			StreamResult result = new StreamResult(pw);
			transformer.transform(source, result);
			System.out.println("生成XML文件成功!");
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	/**
	 * 解析xml，传入完整路径
	 */
	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 (Exception e) {
			System.out.println(e.getMessage());
		}
	}
	
	public static void main(String[] args) {
		DomDemo dd = new DomDemo();
		//dd.createXml("D:\\test.xml");
		
		dd.parserXml("D:\\test.xml");
	}
}